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 91 
 on: Today at 12:27:59 pm 
Started by Travis.Riddle - Last post by Tim McCulloch
That is funny !!!
Some guy actually built labhorns with NO rear covers  ?  Wow.. and they still made OK sound...wow..

Who knows what impedance that made.... at any freq...could have been near toaster oven Rdc, thru whole range lol...or not?

I really don't know what to make about labhorns vs today's offerings.
I built 4 by the original plans, pretty carefully. 
When i test them against the modern subs I have, orbitshifters, and a pair of DIY BMS 18"s,  it's hard not to give the labsubs the nod.  Against the OS, Labs are 3db more efficient, have smoother response, and go a little lower. But the OS does handle at least twice the power. Against the BMS 18"s, the labs are more efficient, but otherwise the pair of BMS rules.
Then I look at another highely regarded alternative, the TH-118. Doesn't seem any more efficient than the labsub, however, like the OS, it handles twice the power.  But phase is mixed up...inherent to tapped horns I think...

I've heard about the heating/compression problem with labhorns, but i didn't see any of that on a handful of gigs with them last summer. 
Maybe folks either pound them past reason, cause they stay clean sounding, or use a too high a freq low pass filter. Impedance says they will burn up quicker used over 95Hz than below I think.....
I wish i could get a true read on the heating prob, if there is one...


Because I'm in the middle of re-plotting subs.  Just built a boatload of mid-high capability, and need to build/buy subs to catch up.

I might actually end up building more labhorns,

 ...or building some DIY TH's or keystones,...or building more of the single BMS 18" BR's I that i REALLY like, .....or maybe even  buying TH-118s or OS's for resale value.
 
I need to get to at least an 8-10 labsub rig...will  restart from scratch if need be..damnit :)

I think you are close.  The LABhorn doesn't sound distressed until right before it dies and most users don't notice the power compression that is the indication you're out of gas.  Some users turned it up more until either the cone came apart or the voice coil burned up.  We've had limiter setting discussions re: the LABhorn in the past.

The LABs don't sound particularly good above 80Hz to me and I'd pick that has my LPF point to start with.

That Tom D's design holds up nicely after 15 years is a very good thing and shows how incremental improvements to performance can be.

 92 
 on: Today at 12:21:16 pm 
Started by Dave Garoutte - Last post by Geert Friedhof
Can't you put the screens in the back of a black party tent? Cheap and effective.

 93 
 on: Today at 12:18:30 pm 
Started by Isaac South - Last post by John Roberts {JR}
My fault - I think I misunderstood.  So, the gain increases the gain no matter what's happening...compression or no compression.  It's just like having another gain knob....got it.

So why not just use the regular gain on my board?  How is this gain different?
Since typical above threshold compressors reduce gain above threshold, make up gain is often added inside the compressor path to restore nominal loudness vs the uncompressed signal.

JR

 94 
 on: Today at 12:09:36 pm 
Started by Richard_Stringer - Last post by Chris Grimshaw

My observations about re-working existing loudspeakers come down to "it is what it is."  If it could have been more, it would have been.  The engineers who design loudspeakers wring the most subjective performance out their products already (stock) and attempts by end users to 'improve upon' tend to fall flat and represent funds misspent in pursuit of an elusive goal.

While I tend to agree, these Wharfedale cabinets would be lucky if they had a bottom-of-the-line Eminence driver in there.
Putting something a bit better in there has the potential to improve things massively IMO, so long as the ports are re-sized according to the new driver's T/S parameters etc. Just dropping different drivers in can be a real crap-shoot without doing the maths first.

Chris

 95 
 on: Today at 12:01:40 pm 
Started by Andrew Broughton - Last post by Keith Broughton
Thanks for the info. Been a while since i used WWB regularly.
I would be careful about using the more frequencies option for iem transmit especially if an active combiner is involved. You usually want to calculate those freqs with all the IM parameters set conservatively. Getting more freqs involves turning off the 2tx 5ths, 3tx 3rds, or both.
Good to know John.
BTW.. could you contact me vi email?
kd.broughton@gmail.com

 96 
 on: Today at 11:55:41 am 
Started by Travis.Riddle - Last post by Mark Wilkinson
Simply having the drivers other side exposed to the outside is NOT a tapped horn.

The details are how the sound from the other side of the driver will also load the horn.

Here is a link to the "basic operation" of the tapped horn

http://www.danleysoundlabs.com/danley/wp-content/uploads/2012/01/The-Tapped-Horn.pdf

Joking brother !!!

 97 
 on: Today at 11:50:50 am 
Started by Isaac South - Last post by Geert Friedhof
Isaac, how many times have you been told to turn the gain down until the red light doesn't flash anymore?

I lost count.

Just do it, and go from there. Step by step.

 98 
 on: Today at 11:50:20 am 
Started by Travis.Riddle - Last post by Ivan Beaver
Maybe the guy was really precocious.....I mean, he sort of invented a "tapped (lab)horn"  ;D
Simply having the drivers other side exposed to the outside is NOT a tapped horn.

The details are how the sound from the other side of the driver will also load the horn.

Here is a link to the "basic operation" of the tapped horn

http://www.danleysoundlabs.com/danley/wp-content/uploads/2012/01/The-Tapped-Horn.pdf


 99 
 on: Today at 11:49:55 am 
Started by Richard_Stringer - Last post by Tim McCulloch
Richard, you've certainly been dealt a lousy hand and I applaud your tenacity.

We Yankees tend to forget that things can be very different in England, too, and that the new/used/reclaimed market is not same as here in the USA or Canada.

My observations about re-working existing loudspeakers come down to "it is what it is."  If it could have been more, it would have been.  The engineers who design loudspeakers wring the most subjective performance out their products already (stock) and attempts by end users to 'improve upon' tend to fall flat and represent funds misspent in pursuit of an elusive goal.

Experimentation is good and often leads to better understanding.  Try the simulations and modeling in your software using the speaker's interior cabinet cubic volume and take into account the amount of volume displaced by the woofers.  The only variables you have control over are port dimensions and loudspeaker choice.  The loudspeaker you desire to use may not be a good fit because the cabinet is too small or too large, making the port dimensions impractical or unobtainable.  It's a puzzle with many parts that move around.

Good luck in all your endeavors.

 100 
 on: Today at 11:44:47 am 
Started by Andrew Broughton - Last post by John Sulek
In WWB6 there is a feature called Inclusion Groups. This feature enables you to assign devices to a group and define the range you want frequencies selected from and what order you would like groups to be calculated.

For example: I have 8 channels of Shure UHF-R and 8 Channels of Sennheiser IEMG3's

I want to achieve three things with my inclusion groups
1. I want to put all my devices in clean frequency ranges
2. Since Sennheiser G Band, and Shure J5 Band overlap a want to separate the mics from the IEM's
3. I want to have WWB calculate the IEM's first

I create two inclusion groups. The group for the IEMs I only allow it to pick frequencies in TV channel 32, and in the group for J5's I allow frequencies in TV channels 40 and 41. Then in the list of inclusion groups I put the IEM Group before the Microphone group so that it calculates the IEM frequencies first. I set the IEM to more frequencies so I can cram them in one channel and I press calculate and the magic happens. All my frequencies are in the ranges that I want them.

Here is a like to a youtube video from Shure that explains Inclusions groups.

https://www.youtube.com/watch?v=Ye7xMRlcIss

I hope this helps.

Thanks for the info. Been a while since i used WWB regularly.
I would be careful about using the more frequencies option for iem transmit especially if an active combiner is involved. You usually want to calculate those freqs with all the IM parameters set conservatively. Getting more freqs involves turning off the 2tx 5ths, 3tx 3rds, or both.

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