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Old 16th May 2006, 03:43 PM   #1
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Default damping factor/stereo/bridged

I'm powering a DIY sub using a stereo/bridgeable amplifier. There won't be any power gained either way but I wanted to run this past you guys so I know how to wire this puppy up.

The driver is a 4 ohm, dual coil driver. The amplifier will deliver 500W to each coil running the left channel to one coil and the right channel to the other coil.

OR...

If I connect the coils in series (8 ohm load now) and bridge the amplifier, I will 1000W shared to both coils.

So my question is:
Is it better to run an amplifier bridged at 8 ohms for more damping factor and series two coils together (I'm guessing amplifier distortion goes up a little in bridged mode?) or run one coil on one channel and one coil on the other channel. Anybody hook up a sub this way? Will the tiny difference in output between two channels force the two coils to "fight" each other or something??
Thanks guys....
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Old 16th May 2006, 09:14 PM   #2
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I think a lot depends on the speaker and amp parameters. Could you give a bit more specs?

/Hugo
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Old 17th May 2006, 01:01 AM   #3
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The amp is a Krell KAV-2250, 500WX2 into 4 ohms or 1000WX1 into 8 ohms in bridged mode.

The woofer I purchased is an Ascendant Audio Arsenal 15, 600W rms, 750W peak, Dual Voice coil, 4ohm per coil.

The box is a 9.6 cu ft sealed enclosure...thanks again for any advice.
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Old 17th May 2006, 04:56 PM   #4
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Default I think your first option sounds great

This is just based on personal experience, not math: It makes more sense to me to keep the impedance low by using both 4 ohm VCs in parallel. Bridged amps/speakers combos sound "bloated" to me. I'll bet it sounds more responsive this way.


John
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Old 17th May 2006, 04:58 PM   #5
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Default I think your first option sounds great

This is just based on personal experience, not math: It makes more sense to me to keep the impedance low by using both 4 ohm VCs. Bridged amps/speakers combos sound "bloated" to me. I'll bet it sounds more responsive this way.


John
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Old 17th May 2006, 05:09 PM   #6
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OK, first let's clear it up that damping factor in each case will be identical. When you bridge each amps output is in series with the load so you get half the damping factor. Also each side of the amp will see half the load impedance. So you see why it's just like each amp driving the channels individually.

However, there are big advantages of the bridged method. Firstly, the total current flowing in the PSU is half, which is nicer. Secondly, the ground is kept free of heavy speaker currents, which is nice again. Thirdly, the load on the PSU is shared in opposite polarity - it is balanced, this is nicer on the supply and is better for PSRR.

Go bridged.
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Old 17th May 2006, 05:29 PM   #7
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Damping factor as a useful concept for judging amplifiers is nonsense.

Go bridged, for all the reasons Richie elucidates so eloquently above.
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Old 17th May 2006, 07:41 PM   #8
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Default Better yet...

Try both. Your ears are the best judge for your taste.
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Old 18th May 2006, 03:10 PM   #9
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I think it depends on the amplifiers ability, i would also rather use it in bridged mode as long as the coils are in series.
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Old 18th May 2006, 04:04 PM   #10
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I've never like the sound quality of a bridged amplifer...
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