Would this crossover work for my subwoofer? - diyAudio
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Old 18th November 2013, 04:45 AM   #1
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Wink Would this crossover work for my subwoofer?

Hi, I am new to this community. Recently the following P.A. system was purchased for my Church: (These are all Indian made, except the mixer, so kindly refer the link for specification).

1. AHUJA DXA-1802 (1800 Watts) (1 amp) Ahuja Sound Solutions

2. AHUJA SPX-400 (350 Watts) (two speakers) Ahuja Sound Solutions

3. AHUJA SWX-650 (600 Watts) (1 sub) Ahuja Sound Solutions

4. BEHRINGER X2222 Behringer: XENYX X2222USB

The stereo output of the mixer is fed straight into the amp. The amp is dual channel, so one channel runs two speakers and the other channel runs the sub.

My first question - Is it right to hook up this way or is there any other way round?

Second question - I want to add a passive crossover in between for my sub to roll off the high frequencies. Would this crossover work? Ahuja Sound Solutions

OR

should i go for an active crossover?

Waiting for a decent answer!
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Old 18th November 2013, 06:53 AM   #2
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First of all you will not be operating in stereo.

By having the 2 x SPX-400 on one channel, they will both be outputting the same half of the stereo image.

The sub will be trying to output the other half of the stereo image.

You really need three amplifiers. (Or 2 stereo amplifiers)

1 for LEFT hand SPX-400
1 for RIGHT hand SPX-400
1 for SWX-650

The sub is usually fed from a mono feed with the LF crossover before the amplifier.

Last edited by KatieandDad; 18th November 2013 at 06:57 AM.
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Old 18th November 2013, 10:10 AM   #3
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From your post it looks as though you are not trying to do this DIY fashion ?

You would probably be better with an active sub which would have its own crossover built into it.
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Old 18th November 2013, 10:43 AM   #4
sreten is offline sreten  United Kingdom
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Hi,

Its easy enough with a typical mixer to mix stereo
in to mono out on the left and right channels.

You can then EQ each channel to suit its purpose,
a from of crude active crossovers that will work.

With an extra amplifier you could remain in stereo
and use the monitor mix output for the subwoofer.

rgds, sreten.
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Old 18th November 2013, 10:47 AM   #5
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I'm not too sure if he wants stereo or mono.
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Old 18th November 2013, 11:46 AM   #6
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Quote:
Originally Posted by KatieandDad View Post
I'm not too sure if he wants stereo or mono.
I know that the output isn't stereo. My question is not about stereo output.
I just wanted to know about the passive crossover (link given). Would it work with the sub?
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Old 18th November 2013, 03:28 PM   #7
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yes it would work but at 250 hz at loud volumes your sub might wind up boxier sounding than you'd like!
the question of stereo is valid because it kind of determines allocation of equipment resources.
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Old 18th November 2013, 05:03 PM   #8
sreten is offline sreten  United Kingdom
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Hi,

It would work but is not needed. It would would be needed
for running a sub and speaker off the same amp channel.

rgds, sreten.
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Old 20th November 2013, 12:54 PM   #9
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well there's no other x-over in the equipment list and running the subwoofer full range ain't gonna be pretty.
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Old 20th November 2013, 01:58 PM   #10
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A fixed frequency active crossover is not difficult to build, cheap, and will increase your loudness considerably. For the time being you are feeding into each of the speakers frequencies they can't use, and are merely heating their voice coils. Before audio quality op-amps were available I built them round emitter followers, complementary times one amps, darlington pairs and once cathode followers on a double triode (I had the voltage available, so…). Just Googling 'active crossovers' will give a selection of workable circuits.

Variable (or sweep) frequency is a touch more complex.

If you put the passive crossover onto one half of the amp, without loading the HF section, the amplifier is seeing a very odd impedance on its output. I'm not stating it will go unstable, mind, but you're not being nice to it at all, and it never does any harm to give your devices – any of them, not just power amps – the best conditions you can manage.

Really cheap: do a simple 6dB/octave RC network, passive, on the output of the mixer.

In the case of really wide stereo information (some records with two vocalists are mixed hard left/right, one vocalist in each speaker. Your system would make one much quieter than the other, and totally muffled) it would be much better to mix the two outputs to mono, then cross over after the mix. That's for the Behringer's stereo inputs, obviously. If you're running balanced XLRs between the mixer and the amp, I can cobble together balanced circuits, but we are now getting a bit complicated. Clear? Of course it isn't, it's me.
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