amp: 4-ch ... stereo with adjustable xover??

albireo13 · 21st July 2010, 04:01 PM

Hi,
I am looking for a 4-ch amp .. 2-ch with adjustable xover for 2 other channels. I'm playing around with driving woofers separately.
Anyone know where I can find such a thing? Doesn't need to be high-end.

Thx,
Rob

jackand08 · 21st July 2010, 06:05 PM

Personally, I'd try using a car amp as these are very easy to find with 4 channels and often have crossovers or low pass filters too. Instead of hooking them up to a battery, you could try temporarily powering the amps with an old ATX power supply. Whilst you wouldn't be able to push the amps too hard or loud, for testing and experimenting, this should be enough. Just power the amp with the +12V line on the power supply and connect the remote terminal on the amp to to 12V terminal. To turn the ATX supply on, you must short the green wire in the main motherboard connector to one of the ground (black) wires.

albireo13 · 21st July 2010, 07:18 PM

great idea. I didn't think of looking at car amps. I'll check out my local Worst Buy.

Franz Gysi · 21st July 2010, 07:27 PM

Why not a MiniDSP with a two way plugin and the MiniAmp board?

MiniDSP

My setup actually:

Franz

JayeSel · 21st July 2010, 07:45 PM

The new 4 channel Matrix amps have built in x-overs, and also can be bridged. Oh, and they're only 2U

Matrix Amplification - The power to deliver

XT...EQ series

albireo13 · 21st July 2010, 11:34 PM

Franz ... neat!
What do you use the miniDSP for? Do you like it?

Rob

albireo13 · 21st July 2010, 11:36 PM

which 2-way plugin do u use?

Franz Gysi · 07:25 AM

Albireo

I use the MiniDSP for my nearfield setup at my PC.

Two fullrange speakers and one subwoofer.

The plugin used is the 2.1 PEQ.

If I like it?

Yes, it is not a bad solution

What does this mean?

MiniDSP: the input AD converter and the output DAC included in the ADAU1701 chip are not of the best quality.

So, I use the MiniDIGI board's SPDIF input as digital input device.

The MiniAMP is quite good but does not reach the quality of good t-amps.

I have the intention to later use the spdif out of the MiniDIGI, remove the amp, attach my own DAC and amplifiers.

The functionality is very appealing, as you have many correction possiblities with the DSP plugin.

Franz

Franz Gysi · 22nd July 2010, 07:21 AM

This is how my nearfield setup looks like:

On the desk you can see two Veravox 3S fullrange speakers, built in ceramic balls. Alternatively I am using Fostex FE83E.

As you can recognize, the desk is closed with a backwall and therefore building an open baffle for the 15" Goodmans sub.

Franz

21st July 2010, 04:01 PM	#1
albireo13 diyAudio Member Join Date: Feb 2010	amp: 4-ch ... stereo with adjustable xover?? Hi, I am looking for a 4-ch amp .. 2-ch with adjustable xover for 2 other channels. I'm playing around with driving woofers separately. Anyone know where I can find such a thing? Doesn't need to be high-end. Thx, Rob

22nd July 2010, 07:18 AM	#8
Franz Gysi diyAudio Member Join Date: Oct 2007	Albireo I use the MiniDSP for my nearfield setup at my PC. Two fullrange speakers and one subwoofer. The plugin used is the 2.1 PEQ. If I like it? Yes, it is not a bad solution What does this mean? MiniDSP: the input AD converter and the output DAC included in the ADAU1701 chip are not of the best quality. So, I use the MiniDIGI board's SPDIF input as digital input device. The MiniAMP is quite good but does not reach the quality of good t-amps. I have the intention to later use the spdif out of the MiniDIGI, remove the amp, attach my own DAC and amplifiers. The functionality is very appealing, as you have many correction possiblities with the DSP plugin. Franz Last edited by Franz Gysi; 22nd July 2010 at 07:25 AM.

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21st July 2010, 06:05 PM	#2
jackand08 diyAudio Member Join Date: Oct 2008 Location: Wild North West...of England	Personally, I'd try using a car amp as these are very easy to find with 4 channels and often have crossovers or low pass filters too. Instead of hooking them up to a battery, you could try temporarily powering the amps with an old ATX power supply. Whilst you wouldn't be able to push the amps too hard or loud, for testing and experimenting, this should be enough. Just power the amp with the +12V line on the power supply and connect the remote terminal on the amp to to 12V terminal. To turn the ATX supply on, you must short the green wire in the main motherboard connector to one of the ground (black) wires.

21st July 2010, 07:18 PM	#3
albireo13 diyAudio Member Join Date: Feb 2010	great idea. I didn't think of looking at car amps. I'll check out my local Worst Buy.

21st July 2010, 07:27 PM	#4
Franz Gysi diyAudio Member Join Date: Oct 2007	Why not a MiniDSP with a two way plugin and the MiniAmp board? MiniDSP My setup actually: Franz

21st July 2010, 07:45 PM	#5
JayeSel diyAudio Member Join Date: Jul 2010 Location: Harrogate	The new 4 channel Matrix amps have built in x-overs, and also can be bridged. Oh, and they're only 2U Matrix Amplification - The power to deliver XT...EQ series

21st July 2010, 11:34 PM	#6
albireo13 diyAudio Member Join Date: Feb 2010	Franz ... neat! What do you use the miniDSP for? Do you like it? Rob

21st July 2010, 11:36 PM	#7
albireo13 diyAudio Member Join Date: Feb 2010	which 2-way plugin do u use?

22nd July 2010, 07:21 AM	#9
Franz Gysi diyAudio Member Join Date: Oct 2007	This is how my nearfield setup looks like: On the desk you can see two Veravox 3S fullrange speakers, built in ceramic balls. Alternatively I am using Fostex FE83E. As you can recognize, the desk is closed with a backwall and therefore building an open baffle for the 15" Goodmans sub. Franz

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