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Sound Reinforcement - Forums for Live Sound Professionals - Your Displayed Name Must Be Your Real Full Name To Post In The Live Sound Forums => SR Forum Archives => LAB Subwoofer FUD Forum Archive => Topic started by: Adam Mottley on October 07, 2005, 09:21:41 am

Title: Servo-Drive Bass Tech 7 ?
Post by: Adam Mottley on October 07, 2005, 09:21:41 am
Hi guys,

What are the perils of buying these cabs used ? Four of these cabs are avalible locally for a great price. Reviews here on the LAB seem positive. What are the maintenance needs/pitfalls of the Servo system ?

Thanks,

Adam
Title: Re: Servo-Drive Bass Tech 7 ?
Post by: Tim Duffin on October 08, 2005, 01:35:45 am
well..

1.  The first thing is that they are often too loud and people dont like them because they have very little distortion. Most customers are accustomed to cone breakup, intermodulation distortion, cabinet resonances and bleed to the rear of the sub, something which servodrives do not ever do. This being the case, I dont make much money from them because there is no demand except at HUGE shows where people can be seen fainting in front of them.

2.  The belts need to be replaced after they are worn (no big deal)

3.  I recently had one of the rubber plugs pull out from the center of the cone and punch a hole in the surround--little duct tape and a big fender washer fixed that one.

4.  I honestly do not know how much another entire module costs if one "lets the smoke out" of the motor assembly.  I have been told its ridiculously expensive.

5. They are heavier than you think.

6. other than that-- have fun, the spec of 150Db peak at 60Hz is no joke--they are very uncomfortable at that level.

T
Title: Re: Servo-Drive Bass Tech 7 ?
Post by: Adam Mottley on October 08, 2005, 03:21:50 am
Tim,

Yes, you are right about them being loud. I used to work a large club in southeast Alabama that had Servodrives powered with Crest amplification. Very large room (about the size of a small gym) and no issues with the "not enough bass" syndrome.

The reason for the post is that these cabs are priced riduculously inexpensive. They are at a reputable dealer, so I would *think* they are ok, serviceablity-wise. They look decent cosmetically (some normal scuff/scratches), but I have not powered them up. There are four cabs up for sale. $495 USD each.

I thought they would be a good set of subs to have around when doing larger outdoor shows, instead of front-loaded 2x18 cabs. The price makes it feasible to let them sit idle when not in use.

Any tips on what to look for in a Servodrive that's "just about gone" (major overhaul) or one that needs minor servicing (belts) ?

Thanks for the information.

Adam
Title: Re: Servo-Drive Bass Tech 7 ?
Post by: Timmahh on October 09, 2005, 09:47:39 am
Adam, if you do a search of the forums, you ll find many previous post on them,  You may want to try to look for Servo Johns post. seems to me hes very mucy up on them.  for 500 each, if they dont need a major overhaul, how could you go wrong.  good luck and great base.
Timmahh
Title: Re: Servo-Drive Bass Tech 7 ?
Post by: The Guy on October 09, 2005, 11:30:43 am
Adam,

For the VLF stuff there is nothing out there that will touch them.  Make sure your full range setup is up to snuff!  They are a SUB, not a bass cabinet.  The BT7's lack "punch" but have more "woof" than can be imagined.

Another note:  they do not need a ton of power.  When I mixed on a set, they were being powered by a Crown 1200, one box per channel.  If you try and power them like a conventional sub (i.e. 5000VZ, LAB, 9001, etc) you will let the smoke out for sure.  They don't let you know when they're out of gas.  I've heard its easy to break belts/burn up motors this way.

For $500 each, if they work, buy them NOW.

-JB
Title: Re: Servo-Drive Bass Tech 7 ?-SDL5's
Post by: Ivan Beaver on October 09, 2005, 03:22:46 pm
Jim is right about the power.  I had some of the early SDL-5's-the predicessor to the BT7's. It was without a doubt the worst money I have ever spent in audio.  I spent more money on keeping them working than I did for the cabinets New!  The BT7's have a different drive system than the SDL 5's-so the timing belt problems are not an issue any more.  I started powering mine with a Crest 8001.  I had a couple of problems.  With just 1 per side I would overheat the amp and shut it down.  These things are a heck of a load on an amp.  When I solved the cooling issue by force cooling the amp, I would tear up timing belts and tear up the rotary to liner drive system with to much power-I even tore up a couple of cones.

I switched to Crown 2400's.  The sound difference was amazing, with the Crown winning out.  With my other bass cabinets (2x18") the sound quality was very close-so as not to be noticed-but with the servo's the difference was HUGE!.  The crowns also overheated (1 cabinet per side of the amp) and I solved the cooling issue with them also-and they still tore up cabinets-just not as fast-even with the PIP-CLP card in the amp and a front end compressor.  The Crown MA1200 is probably the best choice for the cabinets-powerwise and sound wise.

Don't get me wrong-when those cabinets were working-they were amazing-I just couldn't keep then working long enough.  THe BT7's go lower (due to a different horn design-The SDL5's were a W cabinet and the Bt7'S are basically a bent horn.

I later found out from Tom Danley that during the time I was having the problems, they were having problems with the manufacturer not making the belts to their spec.  A lot fo good that did me-I did not get any warranty work (I did not ask for any) and spent many thousands of dollars fixing them.

Those problems are worked out with the BT7s.  I imagine that they are still quite a load on an amp.
Title: Re: Servo-Drive Bass Tech 7 ?-SDL5's
Post by: Antone Atmarama Bajor on October 09, 2005, 06:18:55 pm
     I have 4 Of them.  The only problem I have had with amps overheating trying to run them at 2 Ohms.  I've been powering them with a pair of CARVIN DCM 1500's  That gives me 500Watts a cab.  Limiters off as I have found the limiters are not properly calibrated and limit asymmetrical from channel to channel.

    Limiters are not recommended with BT7's anyhow.  It is important to not allow your amplifiers to clip with the BT7's.

 Even if you have a nice steep low pass filter crossing over the Subs Clipping the Amps generates High frequency harmonics.  As I understand it the belts and motor can't really react to very fast rise times so they start slipping cause belt friction and overheat really quick.

    So Clipping amps not good.  Hard clipping amps really really bad for the BT7s.

     If you get a chance to audition the BT7's I suggest PIMP by 50cent and Get Low By Li'l John and the Yin Yang Twins.  Both of them have some nice bass tones in the Low 30Hz'region.

    If anyone else has any suggestions for audition material there isn't that much music produced with much bellow 40 or 50Hz.

    You are getting a steal if you can get them for that much a box, regardless of the condition of the module ~1800$.  If you pass let me know I might want to buy them.

Antone-

   
Title: Re: Servo-Drive Bass Tech 7 ?-SDL5's
Post by: John Halliburton on October 09, 2005, 08:51:58 pm
First, the Basstech 7 is rated at 400watts continuous, 800watts peak.  A 500 watt amp at 2ohms load is not what I would consider good.  I don't want to sound mean, I'm just trying to make a real world recommendation.  Switching to something like a Macrotech 2400, where you have one Basstech on each channel would be much healthier, and probably sound a bunch better.
To JimB's comments about not having a lot of punch(kick drum in the 70hz region is how I interpret that), I've not had that problem-I think the fact they have a lower cutoff than many other subs causes the balance of the sub to sound "different", and the lower distortion output probably contributes as well.
By the way, the 400 watt continuous rating is long term, pink noise, 30-100hz.  We used to hook them up in the "death room"(and believe me, that was aptly named), and the last time we tested any went 30 hours straight.  We stopped because we were tired of hearing it, even with a 30db drop outside of the "death room".

Best regards,

John Halliburton
Title: Re: Servo-Drive Bass Tech 7 ?
Post by: Chris Davis on October 09, 2005, 10:45:30 pm
I have a couple and I have a friend who has a couple.  We kind of feed off each other in terms of equipment buying decisions.  Two of them placed together are bay-yad. Cool To this date we have not made a cluster of 4 because...a)we hardly see each other and b)there has never been any reason to. Shocked

Chris
Title: Re: Servo-Drive Bass Tech 7 ?-SDL5's
Post by: Antone Atmarama Bajor on October 10, 2005, 03:12:07 am
I only ran the BT7's at 2Ohms once  @ 375Watts per cab.  We didn't have another amp at the time.  I run the BT7's with 500 Watts per cab.  No problems yet.

    The BT7 are rated at 800Watts "Peak RMS" for 15 Seconds
I think 500 is prety safe if I never run into clipping or heavy limiting.

Antone-
Title: Re: Servo-Drive Bass Tech 7 ?
Post by: Tim Duffin on October 10, 2005, 04:40:40 am
So, you want to use them for outdoor shows.  I wouldn't  recommend that unless you somehow can have 4 on one side and 4 on the other--
The reason is because they do not behave like a front loaded 2x18 cabinet outside.  The bass seems to dissipate much faster in front of the horns as you walk away than with a stack of say--4JBL 4719x cabinets.  In fact, I had placed 4 servo's in a cluster outside and was not at all impressed with their performance far away.  

Conversely, I placed 2 4719x cabinets stacked on each side of the stage at the same venue and found that they were MUCH louder far away than the servos.  up close (5 feet) there is just nothing that can describe the feeling....hmm...well... imagine the ground being pushed down under your feet and causing your leg muscles to involuntarily force you to hop backwards slightly and add to that your eyeballs unable to focus on anything and the impending headache because its difficult to breathe.

It's easy to test out servo's before you buy them.  Plug them in, if any of them make a farting sound--dont buy them or open it up and look at the module.  Even if I didnt use them I would purchase them in a heartbeat just so you could say "I have the most powerful subwoofer ever created"  Which generally tends to sound impressive to customers even if they don't rent them.

Tim
Title: Re: Servo-Drive Bass Tech 7 ?
Post by: John Halliburton on October 10, 2005, 09:21:33 am
"The bass seems to dissipate much faster in front of the horns as you walk away than with a stack of say--4JBL 4719x cabinets. In fact, I had placed 4 servo's in a cluster outside and was not at all impressed with their performance far away."

I'd really suspect that they were not set up properly-that is not the norm.  As Tom Danley has pointed out before(and others), the radiating area of the mouth vs. cones causes the "less intense" feeling up close.  However, at distance I have heard it and measured the difference, the BT7, Labhorn, BeDeep(and other horn loaded subs) hold up much better, that is one reason Tom measures at 10 meters and calculates efficiency back to 1meter, to get a more meaningful figure.

"The BT7 are rated at 800Watts "Peak RMS" for 15 Seconds"

Antone, this is a pretty robust figure too.  However, as long as you're not clipping the amps that you have, you're good.  It is fairly common practice to use 2X the continuous power rating for the amp channel, so a Macrotech 2400 is a nice match, as one channel into a 4ohm load produces 750watts continuous(at 20-20khz, the more conservative spec).  Better to have the clean headroom.

Best regards,

John
Title: Re: Servo-Drive Bass Tech 7 ?
Post by: Adam Mottley on October 10, 2005, 12:09:20 pm
Thanks for all of the informative replies. You guys are great.

After careful review, I have decided not to get the ServoDrives based on size and weight considerations. At 45"x45"x22.5", four BT-7's are just too much for my current truck pack.

If anyone wants to check out this deal, check here:

http://www.soundpro.com/SpecDetail.asp?ID=187

Priced @ $495, USD, this deal seems hard to beat if someone is in the market for four BT-7's.

Thanks again for all of the help.

Adam

[edit] removed image
Title: Re: Servo-Drive Bass Tech 7 ?-SDL5's
Post by: The Guy on October 10, 2005, 02:28:14 pm
John Halliburton wrote on Sun, 09 October 2005 20:51


To JimB's comments about not having a lot of punch(kick drum in the 70hz region is how I interpret that), I've not had that problem-I think the fact they have a lower cutoff than many other subs causes the balance of the sub to sound "different", and the lower distortion output probably contributes as well.



John,

I agree with you totally.  I wasn't at all ragging on the subs.  As a labhorn user myself I understand that the lack of harmonic distortion can be interpreted as lacking 'punch.'  I was advising that (like a LAB) they should not be run up too high in the crossover point, as they tend to get that "not so good" sound going.  IMO, the BT7's really rock in the 30-60 range.  Additionally, when I've mixed on them (not my PA) time alignment may have been an issue.  But man, down low....damn!

-JB
Title: Re: Servo-Drive Bass Tech 7 ?-SDL5's
Post by: John Halliburton on October 10, 2005, 03:37:45 pm
Jim,

No problem.  There are so many variables that it can be almost impossible to determine anything without actually being there and working through things.  You point out another very realistic possibility-the time alignment with the top boxes.

Take care,

John
Title: Re: Servo-Drive Bass Tech 7 ?-SDL5's
Post by: ThomasDameron on October 10, 2005, 10:40:39 pm
JB and everybody else,

I haven't heard or mixed on bt7's but I understand what you're saying about keeping the x-over low.  How high do you think would be reasonable?  Do you think 110-120hz would be acceptable or does it really need to be 70-80hz?

thanks,
thomas d.
Title: Re: Servo-Drive Bass Tech 7 ?-SDL5's
Post by: Chris Davis on October 11, 2005, 12:03:14 am
ThomasDameron wrote on Mon, 10 October 2005 22:40

JB and everybody else,

I haven't heard or mixed on bt7's but I understand what you're saying about keeping the x-over low.  How high do you think would be reasonable?  Do you think 110-120hz would be acceptable or does it really need to be 70-80hz?

thanks,
thomas d.


I think they could probably be run as high as 80 Hz, 100 if you are covering for some bass shy tops.  Overall the sound down from the very bottom up to 60-80 is very pure.  Moreso than with other types of horns.  At higher frequencies, not the servo transducers, but the horn itself starts to do strange things with reflections and in my opinion start to get muddy.  This seems to me to be a phenomenon exhibited with ANY bass horn (not just the BT7).  So if you do operate it up to 100 - 120 or so the upper bass will not sound the same as if you had boxes designed to play in that range.  It will at least still have power up to 100 Hz though.

I think they are doable up to 100 Hz but I also EQ them some and don't push them that hard either.  I have found that replacing the foam tape inside where the wooden servo module seals up against the mouth of the horn will greatly improve the upper bass response.  Easy enough to get in there and do it, and while you are at it you can inspect the module too.

I do agree with the blanket statement of keeping the crossover low when using horn loaded subs.  I would say you should at least start off with  80-90 Hz or so and see how good that sounds before you start tweaking.  You might actually be more satisfied with having a little bit of a frequency "hole" in the upper bass instead.

Chris
Title: Re: Servo-Drive Bass Tech 7 ?-SDL5's
Post by: Ivan Beaver on October 11, 2005, 07:33:55 am
ThomasDameron wrote on Mon, 10 October 2005 22:40

JB and everybody else,

I haven't heard or mixed on bt7's but I understand what you're saying about keeping the x-over low.  How high do you think would be reasonable?  Do you think 110-120hz would be acceptable or does it really need to be 70-80hz?

thanks,
thomas d.

Many times people confuse electrical xover and acoustical.  The electrical is often lower than the acoustical (in the bass/sub region).  Since subs are typically run at a ligher level (to compensate for the Fletcher/Munson curves of our ears) the point at which they "cross over" to the upper cabinets is higher than the electrical crossover point.  I would suggest the highest slope low pass you have.

And these are SUB cabinets-not bass cabinets, so they are not intended to used that high.
Title: Re: Servo-Drive Bass Tech 7 ?-SDL5's
Post by: Chris Davis on October 11, 2005, 11:41:51 am
Ivan Beaver wrote on Tue, 11 October 2005 07:33

ThomasDameron wrote on Mon, 10 October 2005 22:40

JB and everybody else,

I haven't heard or mixed on bt7's but I understand what you're saying about keeping the x-over low.  How high do you think would be reasonable?  Do you think 110-120hz would be acceptable or does it really need to be 70-80hz?

thanks,
thomas d.

Many times people confuse electrical xover and acoustical.  The electrical is often lower than the acoustical (in the bass/sub region).  Since subs are typically run at a ligher level (to compensate for the Fletcher/Munson curves of our ears) the point at which they "cross over" to the upper cabinets is higher than the electrical crossover point.  I would suggest the highest slope low pass you have.

And these are SUB cabinets-not bass cabinets, so they are not intended to used that high.



Hi Ivan, I was just curious, is there a horn-loaded "woofer" you or someone else  might have personal experience with and recommend to bridge the gap between a large-format horn-loaded sub (similar to LabSub or BT7) and oh...say 200-300 Hz?  This is for a club system where the tops (horn-loaded dedicated mid-high) are already purchased but just need to be filled out.  Size is not an issue.  I am not the one calling the final shots on this, but just looking for some feasible options to bring to the table.

Thanks
Chris
Title: Re: Servo-Drive Bass Tech 7 ?-SDL5's
Post by: E2 on October 11, 2005, 05:43:01 pm
Test tracks...

I use Al Dimeola's Scenario Album, track titled Cachaca... has short accents in the 35 - 40hz range. A real head turner.

Title: Re: Servo-Drive Bass Tech 7 ?
Post by: Gareth James on October 11, 2005, 06:37:17 pm
if you want a good test track for subs then prodigy poison (album version) has tones right down to below 30hz...

and if you really want to see cones flapping get a hold of the single and play the second track rat poison.

the extreme LF at the end of the track detached the surround of my dads woofers on his rather expensive classic sansui sp-3500's 14" woofers - back before i knew what port loading was Embarassed

glued my fingers to the surround with superglue fixing the surround back on...hey i was only 14! Rolling Eyes

worked tho...got em on right here as i write this Razz
Title: Re: Servo-Drive Bass Tech 7 ?
Post by: Johannes Rodin on October 12, 2005, 05:38:41 am
Yello  "Pocket Universe" track 2 has some very serious bass with high level down to low twenties. Its my favorite to test basshorns with. A word of warning. It creates very high excursion!
Title: Re: Servo-Drive Bass Tech 7 ?-SDL5's
Post by: Ivan Beaver on October 12, 2005, 04:01:20 pm
The old community "boxer" would do a good job of that-or a "levithan" without the hron extensions.  I don't know if either of these are sitll available, but you might try Community.  They are both straight horns with 2x15" drivers.  They don't go real low (you already have that covered) and since they are straight-the upper freq freq will come through fine.
The old JBL 4550 which is also a dual 15" might be another choice.

All of these cabs are sizable however.
Title: Re: Servo-Drive Bass Tech 7 ?-SDL5's
Post by: Chris Davis on October 12, 2005, 05:07:07 pm
Ivan Beaver wrote on Wed, 12 October 2005 16:01

The old community "boxer" would do a good job of that-or a "levithan" without the hron extensions.  I don't know if either of these are sitll available, but you might try Community.  They are both straight horns with 2x15" drivers.  They don't go real low (you already have that covered) and since they are straight-the upper freq freq will come through fine.
The old JBL 4550 which is also a dual 15" might be another choice.

All of these cabs are sizable however.


Hi Ivan, I guess the JBL 4550 might be along the lines of what I am looking for.  Since the mention of one three-letter speaker co deserves another,Very Happy I was thinking about the EAW BH853...also discontinued.  That cab almost approached the size of a LAB sub but not quite as deep.

Chris
Title: Re: Servo-Drive Bass Tech 7 ?-SDL5's
Post by: Tim Duffin on October 12, 2005, 08:06:04 pm
I have never run them over 70Hz--and frankly dont like the sound of them any higher than that.  I believe thats where people start to hate horn loaded subs, whenever the crossover point is too high.

T
Title: Re: Servo-Drive Bass Tech 7 ?-SDL5's
Post by: Chris Davis on October 12, 2005, 09:10:40 pm
Ivan Beaver wrote on Wed, 12 October 2005 16:01

The old community "boxer" would do a good job of that-or a "levithan" without the hron extensions.  I don't know if either of these are sitll available, but you might try Community.  They are both straight horns with 2x15" drivers.  They don't go real low (you already have that covered) and since they are straight-the upper freq freq will come through fine.
The old JBL 4550 which is also a dual 15" might be another choice.

All of these cabs are sizable however.


Hi Ivan, what about the CBS315?  
http://loudspeakers.net/files/specs/new/cbs315.pdf

That cab looks interesting.

Chris
Title: Re: Servo-Drive Bass Tech 7 ?-SDL5's
Post by: Ivan Beaver on October 12, 2005, 09:33:17 pm
Just about any straight horn would work.  What I find interesting is the spec on that cabinet.  It states 107dB 1W/1M.  However if you look at the graph it never-at any freq gets above 104dB.  That is a 3 db difference. And then the higher spl is only over a very limited range.  Over most of the range you are looking at the level is below 100dB.

I do not have any specs on the cabinets I mentioned-just the memory of years gone by.  I would love to (assuming I had the time and the cabinets) measure some of the "classic" cabinets, espically some of the ones I designed and built that I thought sounded good at the time.  And no matter what the actual sound quality was, they worked well for me and outperformed many of the commerical cabinets I went up against.

But to digress---
Title: Re: Servo-Drive Bass Tech 7 ?-SDL5's
Post by: Al Limberg on October 12, 2005, 11:13:34 pm
The combination of triple spider 15s and the cabinet design make me think Community intends this as the sub component of a stadium-type system.  The way the FR rolls off rapidly well below 1k seems to indicate that it might not be the best choice for low mid but then again, I'm just guessing.  I can definitely vouch for the boxers (somewhat modified) in conjunction with the Labs.

Al
Title: Re: Servo-Drive Bass Tech 7 ?-SDL5's
Post by: Chris Davis on October 13, 2005, 06:25:44 pm
Al Limberg wrote on Wed, 12 October 2005 23:13

The combination of triple spider 15s and the cabinet design make me think Community intends this as the sub component of a stadium-type system.  The way the FR rolls off rapidly well below 1k seems to indicate that it might not be the best choice for low mid but then again, I'm just guessing.  I can definitely vouch for the boxers (somewhat modified) in conjunction with the Labs.

Al


I guess I'll have to get a look at this "boxer" cab if I can sometime and add that to their list of possibilities, no sign of it anywhere though.
As far as viable prefab choices go, it seems I have only a few at this point.
Title: Re: Servo-Drive Bass Tech 7 ?-SDL5's
Post by: Craig Leerman on October 13, 2005, 06:48:23 pm
Quote:

As far as viable prefab choices go, it seems I have only a few at this point.


Viking Audio makes a nice small horn loaded 2 X 15" cab designed for JBLs. Specs say it goes down to 55Hz.  It looks a bit like the old Meyer Sound MSL3s except with an eliptical horn.

http://www.vikingaudio.com/english/mcw/mcw.htm#MCW-2

The discontinued Meyer MSL3s or their current MSL4 would also be a good choice for a full range highpack that has horn loaded woofers.  If you are looking for just a horn loaded woofer box without the highs, the Meyer DS-4p is a dual 12" horn loaded 70-200Hz box.

http://www.meyersound.com/
Title: Re: Servo-Drive Bass Tech 7 ?-SDL5's
Post by: Chris Davis on October 13, 2005, 08:00:49 pm
Craig Leerman wrote on Thu, 13 October 2005 18:48

Quote:

As far as viable prefab choices go, it seems I have only a few at this point.


Viking Audio makes a nice small horn loaded 2 X 15" cab designed for JBLs. Specs say it goes down to 55Hz.  It looks a bit like the old Meyer Sound MSL3s except with an eliptical horn.

http://www.vikingaudio.com/english/mcw/mcw.htm#MCW-2

The discontinued Meyer MSL3s or their current MSL4 would also be a good choice for a full range highpack that has horn loaded woofers.  If you are looking for just a horn loaded woofer box without the highs, the Meyer DS-4p is a dual 12" horn loaded 70-200Hz box.

http://www.meyersound.com/



Hi Craig, thanks.  I will look into these tonight.
Title: Re: Servo-Drive Bass Tech 7 ?
Post by: steven d brown on February 13, 2009, 07:14:17 pm
If you have not purchased servodrive basstech  can you foward the email address to the party selling them  also can you tell me the number avaible and asking price along with any interesting info abot the selling cabinets  My email address is sdb1221@gmail.com   Adam  Mottley  email of interest  also others
Title: Re: Servo-Drive Bass Tech 7 ?
Post by: Ivan Beaver on February 13, 2009, 07:17:58 pm
steven d brown wrote on Fri, 13 February 2009 19:14

If you have not purchased servodrive basstech  can you foward the email address to the party selling them  also can you tell me the number avaible and asking price along with any interesting info abot the selling cabinets  My email address is sdb1221@gmail.com   Adam  Mottley  email of interest  also others

I would think that 3 1/2yrs later (than this thread is) something would have changed in that regard? Rolling Eyes
Title: Re: Servo-Drive Bass Tech 7 ?
Post by: Tim Charpentier on February 18, 2009, 07:11:13 pm
Buy it on EBay, & have fun trying to get parts

http://cgi.ebay.com/Servo-Drive-Bass-Tech-7-2-Subwoofer_W0QQ itemZ120378275137QQcmdZViewItemQQptZLH_DefaultDomain_0?hash= item120378275137&_trksid=p3286.c0.m14&_trkparms=72%3 A1234|66%3A2|65%3A12|39%3A1|240%3A1318|301%3A1|293%3A1|294%3 A50