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Author Topic: New to passive PA  (Read 36478 times)

lindsay Dean

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Re: New to passive PA
« Reply #30 on: February 14, 2017, 03:11:04 PM »

Live and Learn,
or live and burn.
 There are people here that have made or avoided
financial audio mistakes with experienced advice.
as the lorax says "you have been warned"
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Debbie Dunkley

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Re: New to passive PA
« Reply #31 on: February 14, 2017, 03:28:00 PM »

Hi Justin-

Well mate, that's where your money went.  Now you have a nice personal instrument & rig and a duff PA.  You made your choice about where to invest in perceived quality.

If you were posting on a guitarist forum and had done the opposite, buying a store-branded guitar and amplifier but got a nice RCF PA, you'd get the same response you're getting here.  Just think about that for a moment.

I like this - nicely put Tim.
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Luke Geis

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Re: New to passive PA
« Reply #32 on: February 14, 2017, 03:31:26 PM »

Lets run some hard numbers.

The subs would be very well powered to nearly over powered by the amplifier. The amplifier providing 500 watts to a sub capable of 600 watts peak. The downside is that the sub is only rated for 89 - 94db 1w @1m. Even at the higher 94db 1w / 1m rating, the sub will only be capable of a peak SPL of 121db. This assumes best possible outcomes. If we go by the lower 89db 1w / 1m rating the sub would only be capable of 116db peak!!!!!

What does that mean? If you measured the highest possible output capable from that sub and amp at 1m from the face of the sub, it will only produce between 116db - 121db. The inverse square law says that you will reduce the SPL level by 6db for every doubling of distance. So at 2m the output will drop to between 110db - 115db. The average listener distance to the middle of the dance floor or desired listener area is between 4m - 8m. This is another 6-12db loss in SPL. Leaving you with 104db - 109 db on the high end to 98db - 103db on the low end. The average rock level show is around 105db - 110db. Your subs would barely be able to do this running at full tilt boogie. Your subs would be crying for mercy after only a few songs. Unless you could keep the red light from showing on the amps, you stand a very good chance of blowing the subs in short order and still not have an real usable SPL from them.

Now about those tops. They are actually properly powered by the amp that comes in the system. The mains are capable of 99db at 1w / 1m. This simply means that with the amp stated for them, they are capable of about 127.7db. Following the same rules as before, by the time you get 4m - 8m away, the best possible output from them will be between 109.7db - 115.7db. Your mains would be outrunning your subs considerably.

So while in theory your PA could provide enough volume to do the job, it will only just do so and would be working as hard as it can to do it. This is not ideal and working a PA that hard all the time will significantly shorten its life. This doesn't factor any sort of EQ or processing that may or may not help the situation. This PA comes with little or no help in this regard. You are going to be seeing a LOT of red lights!

To bring things into perspective, you bought an entire PA system that costs less than even one of the single components that make a PA costs from a reputable company! An amp that costs $600 ( roughly the same in Euros ) is pretty common and is at that point considered to be of par for the course. A passive speaker that costs $600 is again still only considered of average, mid level quality. You bought an entire PA for that price, so what level of quality and performance do you think it will be? When you buy a PA you spend the money on two factors. Its quality of sound and its performance. If the money spent is any indicator of either of those two facts, then you got the equivalent of a model car as a it relates to the real thing it is meant to be a copy of.

My advise is return it, sell it, or burn it for heating your house. Either one of those options is better than trying to make this PA do any real work for you. It will make noise, but I wouldn't go on to say much more about it than that. Keep in mind many of us here have heard systems that cost hundreds of times more than this and still aren't chomping at the bit to get it.
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g'bye, Dick Rees

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Re: New to passive PA
« Reply #33 on: February 14, 2017, 03:58:21 PM »

Luke...

Max SPL for the subs is 94dB as stated...probably the only accurate stat on the page.  The stated frequency range of 20-500hz is really funny and at 22 lbs each for the tops and a bit more for each sub I can't imagine the drivers are at all robust.  The 12" woofers in my old EV S200's nearly outweigh the entire double 15's.

I found a YouTube video "review" of these boxes.  Funny thing is, there' only video...no sound!  But the comments are hilarious if you can read German...and you can probably get it even if you don't.

https://youtu.be/z_-lm1bDeKQ
« Last Edit: February 14, 2017, 05:13:55 PM by dick rees »
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Jeff Lelko

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Re: New to passive PA
« Reply #34 on: February 14, 2017, 04:14:54 PM »

One of my roommates in college had something similar to this.  He got it for free (so that gives you an idea of the value/performance), and it was put to better use as the cat's scratching post...
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g'bye, Dick Rees

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Re: New to passive PA
« Reply #35 on: February 14, 2017, 04:20:01 PM »

One of my roommates in college had something similar to this.  He got it for free (so that gives you an idea of the value/performance), and it was put to better use as the cat's scratching post...

Are you saying those cabs are for pussies?
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Debbie Dunkley

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Re: New to passive PA
« Reply #36 on: February 14, 2017, 04:22:01 PM »

Are you saying those cabs are for pussies?

 ;D
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Don T. Williams

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Re: New to passive PA
« Reply #37 on: February 14, 2017, 04:45:40 PM »

I briefly sold a brand that claimed to have "professional" products (they displayed at NAMM and NSCA) at what looked like bargain prices.  The subs had cast frame 18's with 4" voice coils.  The cabinets were black rat fur covered plywood but the construction of the first pair I received was such that I added bracing and caulking before even offering them for sale.  The "6000 watt DJ series amp" had a 63 volt power supply!!!  It looked inadequate for a 100 watt powered mixer.  I refused to sell the amp and gave it away to a church to drive nursery speaker.  I wasn't worried about deafening babies.

A DJ customer loved the dual 18 subs because they were big and cheap.  I ordered him a second pair but stated there was absolutely no warranty from me.  He would have to deal with the manufacturer as I would not carry their products again due to workmanship. 

Without reading the rest, you know the story.  The second pair had problems and he blamed me for selling them when he got no service from the factory (which is in California).  I'm glad I had it in writing, but the customer didn't come back, and I don't really blame him.

I hope you have better luck, but "professional" for home DJ equipment is a nothing at all like pro audio.
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g'bye, Dick Rees

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Re: New to passive PA
« Reply #38 on: February 14, 2017, 04:47:43 PM »

;D

Well, we finally have the answer on the question of how to remove carpeting from PA cabs:

CATS!  Lots of cats!!!
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Tim McCulloch

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Re: New to passive PA
« Reply #39 on: February 14, 2017, 05:13:53 PM »

I like this - nicely put Tim.

Thanks, Debbie!

He has a limited budget and decided to spend on the stuff that was most important to him as a player in the band.  Long term I think buying a Les Paul and Marshall amp will bring him more personal satisfaction.

How his decision plays with we of the unwashed forum masses depends on which forum the question is in.

Or as was stated in Tea House of the August Moon, "Pornography question of geography." (full quote below)

"World filled with delightful variation.
Example:
In Okinawa, no locks on doors.
Bad manners not to trust neighbors.
In America, lock and key big industry.
Conclusion: Bad manners, good business.
Another example:
In Okinawa, wash self in public bath
with nude lady quite proper...
...but a picture of nude lady
in private home quite improper.
In America, statue of nude lady in park
win prize...
...but nude lady in flesh in park
win a penalty.
Conclusion:
Pornography, question of geography
."
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Re: New to passive PA
« Reply #39 on: February 14, 2017, 05:13:53 PM »


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