Car Sub Vs PA Sub

FlipC · 28th September 2009, 06:02 PM

So I noticed the other day
that my plans for 190 Lt TH using an Eminence Kappa Pro 12A had a snag. That snag being the drivers are 8 OHM. I am going to have 8 total cabinets. I wanted to run these off of 2 Bheringer EP4K's. Problem is they are not rated to do 2 OHM mono.
Now I could use 4 of the Berry 4K's but that puts me over budget.
So I am thinking about using a subwoofer made for car audio applications.
Any of you ever use one (any brand) for PA applications?

teachjava1776 · 28th September 2009, 08:13 PM

Hook some of them in parallel and some in series. That will raise it above 2 ohms.

MikeD

technofreak · 28th September 2009, 10:27 PM

I don't see a problem here - 8 cabs and 2 amps means 2 cabs for each amp channel in parallel (totaling 4 ohms per channel). If I'm not wrong, EP4000 is rated at 2 ohms stereo - just hook 2 cabs to each channel and use "parallel" mode (not "bridge) which sends the same signal to both channels, link the amps to each other as usual - you'll be fine this way. Or set up the subs in stereo

fb · 28th September 2009, 11:18 PM

Be warned there are reports of EP2500s (same as EP4000) dumping DC into 4ohm bridged loads with PA use.

FlipC · 29th September 2009, 05:23 PM

fb.
Those amps are well made. Looking at internal parts shows they are QSC clones
at almost half the price. I compared it to me Crown XLS 602's (made in Mexico) and it is as good if not better. Having read allot of reviews, especially guys in the UK. They all
have had good responses. So if you could post links to any threads about this happening I would appreciate the read.
BUT that is why I worry about running a 2 ohm
bridged load. Which I did this past weekend using my 4 Mini clones. It ran fine and only got warm after 5 hours of use. And at one point it tripped the 15 amp Furman it was on.
(Raheem - Most beautiful girl)

I haven't given much thought about
running in parallel. Why would you run in parallel when the stereo output isn't high enough? The amp is rated 950@4 x2 , 1250@2 x2, and 2400@4 x1.
The speakers are 500w RMS @8 x8 so that gives me:
500w @8ohm x8
1Kw @16ohm x4
1Kw @4ohm x4
2Kw @8ohm x2
2Kw @2ohm x2
4Kw @4ohm x1
So as is the best scenario I came up with is to have the 2 amps running 4 ohm stereo per amp.

So unless I am missing a configuration
that would be better ?

Glowbug · 29th September 2009, 06:03 PM

Depends on the sub. Some I'd consider before others...something from Fi Car Audio, Eclipse, Image Dynamics, etc. should do fine.

fb · 29th September 2009, 11:58 PM

FlipC: This is the one I've seen: http://www.avsforum.com/avs-vb/showp...1&postcount=22

FlipC · 30th September 2009, 06:21 AM

Reading that.
4 Lab 12's running off an EP2500 each. That is a nominal 3 ohm load per amp.
Which in reality is probably lower. Also. Since it wasn't all 4 amps. Just 2.
I would chalk that up to those particular 2 units.
But also I can atest that IF this was the normal case I would have fried one this past weekend. Or at least a driver. 5 hours straight at 2 ohm. And as I said.
At one point I tripped a 15 amp breaker. So it was pushing.

I noticed something else tonight.
I have 2 Crown XLS 602's that are 2 different generations. 1 is made in Mexico and the other in China.

I have a set of Lab 12's that I have tried to run off
a single 602. It wont do it. U get those DC pops. I have to run it in stereo. I could only imagine me trying to run it for hours on end at volume.

But alas ask me in 8 months.
We will see how they fair.

28th September 2009, 06:02 PM	#1
FlipC diyAudio Member Join Date: Aug 2008	Car Sub Vs PA Sub So I noticed the other day that my plans for 190 Lt TH using an Eminence Kappa Pro 12A had a snag. That snag being the drivers are 8 OHM. I am going to have 8 total cabinets. I wanted to run these off of 2 Bheringer EP4K's. Problem is they are not rated to do 2 OHM mono. Now I could use 4 of the Berry 4K's but that puts me over budget. So I am thinking about using a subwoofer made for car audio applications. Any of you ever use one (any brand) for PA applications?

29th September 2009, 06:03 PM	#6
Glowbug diyAudio Member Join Date: Feb 2006 Location: Hillsborough, NC/McLean, VA	Depends on the sub. Some I'd consider before others...something from Fi Car Audio, Eclipse, Image Dynamics, etc. should do fine. __________________ Jim J.

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28th September 2009, 08:13 PM	#2
teachjava1776 diyAudio Member Join Date: Jun 2008	Hook some of them in parallel and some in series. That will raise it above 2 ohms. MikeD

28th September 2009, 10:27 PM	#3
technofreak diyAudio Member Join Date: Dec 2006	I don't see a problem here - 8 cabs and 2 amps means 2 cabs for each amp channel in parallel (totaling 4 ohms per channel). If I'm not wrong, EP4000 is rated at 2 ohms stereo - just hook 2 cabs to each channel and use "parallel" mode (not "bridge) which sends the same signal to both channels, link the amps to each other as usual - you'll be fine this way. Or set up the subs in stereo

28th September 2009, 11:18 PM	#4
fb diyAudio Member Join Date: Apr 2005 Location: Brisbane, Aus	Be warned there are reports of EP2500s (same as EP4000) dumping DC into 4ohm bridged loads with PA use.

29th September 2009, 05:23 PM	#5
FlipC diyAudio Member Join Date: Aug 2008	fb. Those amps are well made. Looking at internal parts shows they are QSC clones at almost half the price. I compared it to me Crown XLS 602's (made in Mexico) and it is as good if not better. Having read allot of reviews, especially guys in the UK. They all have had good responses. So if you could post links to any threads about this happening I would appreciate the read. BUT that is why I worry about running a 2 ohm bridged load. Which I did this past weekend using my 4 Mini clones. It ran fine and only got warm after 5 hours of use. And at one point it tripped the 15 amp Furman it was on. (Raheem - Most beautiful girl) I haven't given much thought about running in parallel. Why would you run in parallel when the stereo output isn't high enough? The amp is rated 950@4 x2 , 1250@2 x2, and 2400@4 x1. The speakers are 500w RMS @8 x8 so that gives me: 500w @8ohm x8 1Kw @16ohm x4 1Kw @4ohm x4 2Kw @8ohm x2 2Kw @2ohm x2 4Kw @4ohm x1 So as is the best scenario I came up with is to have the 2 amps running 4 ohm stereo per amp. So unless I am missing a configuration that would be better ?

29th September 2009, 11:58 PM	#7
fb diyAudio Member Join Date: Apr 2005 Location: Brisbane, Aus	FlipC: This is the one I've seen: http://www.avsforum.com/avs-vb/showp...1&postcount=22

30th September 2009, 06:21 AM	#8
FlipC diyAudio Member Join Date: Aug 2008	Reading that. 4 Lab 12's running off an EP2500 each. That is a nominal 3 ohm load per amp. Which in reality is probably lower. Also. Since it wasn't all 4 amps. Just 2. I would chalk that up to those particular 2 units. But also I can atest that IF this was the normal case I would have fried one this past weekend. Or at least a driver. 5 hours straight at 2 ohm. And as I said. At one point I tripped a 15 amp breaker. So it was pushing. I noticed something else tonight. I have 2 Crown XLS 602's that are 2 different generations. 1 is made in Mexico and the other in China. I have a set of Lab 12's that I have tried to run off a single 602. It wont do it. U get those DC pops. I have to run it in stereo. I could only imagine me trying to run it for hours on end at volume. But alas ask me in 8 months. We will see how they fair.