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Old 15th October 2013, 04:00 AM   #1
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Default PA System: How to connect crossover

From the advice of a thread I created a while ago I'm going to put a crossover into my motley pa system. The goal being to send only the lows to my Peavey nitro bass half stack to use it as a sub woofer.

This is a terrible noob question but how do I connect the crossover into the system? I'm going to get a Behringer CX2310 crossover and based on the images of the back it has 2 inputs but one of them says not used. What I want to do is run from a small mixer to the crossover and then 2 outs to a crown running 2 yamaha speakers (Mids/Highs or full range) as well as one out to a nitro bass half stack (lows only). I'm just not sure how to properly hook it up and I want to make sure I order the proper cables.

Thanks guys,

Brad
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Old 15th October 2013, 08:53 AM   #2
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The "Not Used" input label is only valid when the crossover is being used as a mono 3-way crossover.

Apart from that, I'd recommend you study the Behringer manual - its quite comprehensive on hook-up options.

Exactly which bass amp is it?
Its going to need two inputs if you want to put bass guitar through as well.

Chris
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Old 15th October 2013, 01:37 PM   #3
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I found the manual, I'll look through it tonight thanks.
It's a Peavey NitroBass head on a 4x12" Peavey cab. I'm only going to be using it like a sub for a halloween party we're having (assuming thats ok?). My band days are over.
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Old 15th October 2013, 02:04 PM   #4
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The 4x12 PV cab may not put out enough real "bass" below 50 or 60 Hz. Electric bass cabs don't really go spectacularly low - the exceptions being high end stuff with a 15 or 18 on the bottom. And if you try to boost down low those 12's might not like it. May be fine in the application, but I wouldn't expect too much out of it - or push it crazy hard.
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Old 15th October 2013, 02:50 PM   #5
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Quote:
Originally Posted by wg_ski View Post
The 4x12 PV cab may not put out enough real "bass" below 50 or 60 Hz. Electric bass cabs don't really go spectacularly low - the exceptions being high end stuff with a 15 or 18 on the bottom. And if you try to boost down low those 12's might not like it. May be fine in the application, but I wouldn't expect too much out of it - or push it crazy hard.
If the amp tolerates an instrument input then it will certainly tolerate a mixed music input.

For the op, run the low out from the crossover to the bass amp and the high out to your crown amp.
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Old 18th October 2013, 03:31 AM   #6
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Thanks for all of the info guys. I'll post a second question here to avoid starting another thread if I can.

I was looking at my setup and the more I read about pa systems I'm realizing how little I know! My Yamaha speakers are 8ohms impedence but my crown ce2000 amp is rated at 4 ohms on the back. From what I've read on the data sheet I think that the amp should work for any impedence speaker and the 4 ohms was just chosen as point of reference? correct?

My Yamaha S115V speakers are rated for 500 watts program and the crown amp puts out 400 watts per chanell on 8 ohm stereo. They've always seemed to work fine so I'm assuming that 400 watts is not too underpowered for them?
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Old 18th October 2013, 07:40 PM   #7
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PA amps will drive any speaker of impedance greater than or equal to the amp's lowest rated impedance - sometimes they'll say 300w@8ohm, 600w@4ohm, so 4ohm is the lowest impedance it can drive.
Assuming a perfect power supply (which they never are), you get double power when you halve the impedance. With infinite current drive and enough voltage swing, you could do 300w@8ohm, 600w@4ohm, 1200w@2ohm, 2400w@1ohm, etc etc.

In terms of decibels, going from 400w to 500w is negligible. The Yamahas will be fine.
There's a good article by Rod Elliott about amplifier power: the site appears to be down at the moment, but try Googling and see if you can find anything.

Chris
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