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Old 28th August 2008, 06:27 PM   #1
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Default biamping question(s)

I recently built my first set of speakers (a set of Magna Cum Laudes), and they work great.

This set of speakers is going to college with me, but my dad liked them so much that he would like me to build a second set for the house.

As an amplifier, we have an Onkyo TX-SR805, which is capable of biamping the front speakers.

So my questions are:

Is biamping worth it from a sound quality perspective? (non-biamping already provides more than enough volume)

What changes would need to be made to the crossover network (other than disconnecting the woofers from the mid/tweet)?

Thanks!
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Old 29th August 2008, 09:38 AM   #2
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Default Re: biamping question(s)

Quote:
Originally posted by big314mp
IIs biamping worth it from a sound quality perspective? (non-biamping already provides more than enough volume)
Typically, yes, in my experience.

Quote:
Originally posted by big314mp
What changes would need to be made to the crossover network (other than disconnecting the woofers from the mid/tweet)?

Thanks!
Can't help you with that as I have no idea about your particular speakers.
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Old 29th August 2008, 10:07 AM   #3
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http://sound.westhost.com/bi-amp.htm
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Impedance varies with frequency, use impedance plots of your drivers and make crossover calculations using the actual impedance of the driver at the crossover frequency
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Old 29th August 2008, 10:21 AM   #4
AndrewT is online now AndrewT  Scotland
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I like bi-amping.
If the crossover has twin terminals to allow bi-wiring, it is suitable for bi-amping.
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Old 29th August 2008, 02:47 PM   #5
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Default Re: biamping question(s)

Quote:
Originally posted by big314mp
What changes would need to be made to the crossover network (other than disconnecting the woofers from the mid/tweet)?
you have 2 ways for get bi-amping system as well.
1. use passive exist crossover the both part for tweeter and woofer, loaded separated amplifier. it's easy
2. make active crossover yourself. it's prety difficult but it's looks like arts, engineering
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Old 29th August 2008, 04:28 PM   #6
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What I was thinking, was that I could disconnect the part of the cross that fed the woofers, and make that into the second terminal. I was thinking that the woofer part of the cross would have to be included into the circuit to get the correct frequency roll offs (terminology?), but the link that Pete posted doesn't seem to have any passive cross components on the woofer side.

So, do I need to remove/bypass the woofer part of the cross, or do I need to keep that in the circuit.

The crossover for the speakers:
http://www.partsexpress.com/projects...sover%20Design
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Old 29th August 2008, 04:31 PM   #7
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I should throw in that I can't use active crossovers in the traditional sense, as the receiver I am using has all of that built in (I think) and it is sort of off limits to tweaking as an idiot proofing measure. If I find any more info on it, I'll post it.

Thanks!
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Old 29th August 2008, 07:38 PM   #8
rj45 is offline rj45  United States
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Default passive bi-amping

Quote:
Originally posted by big314mp
What I was thinking, was that I could disconnect the part of the cross that fed the woofers, and make that into the second terminal. I was thinking that the woofer part of the cross would have to be included into the circuit to get the correct frequency roll offs (terminology?), but the link that Pete posted doesn't seem to have any passive cross components on the woofer side.

So, do I need to remove/bypass the woofer part of the cross, or do I need to keep that in the circuit.

The crossover for the speakers:
http://www.partsexpress.com/projects...sover%20Design

You will need to use a terminal block on the speaker that has 4
banana jack connections.
Like this:
http://www.partsexpress.com/pe/showd...number=260-304

The top 2 connections are Plus / Minus
for the tweeters, and the bottom 2 connectors are (surprise)
the Plus / Minus for the woofers. Wire up your woofers to the
bottom connectors, and the mids and tweeter to the top connectors.
For normal use, a little gold plated piece connects the top
and bottom connectors, and you connect your amp to either
the top or bottom, doesn't matter.

For bi-amp use, remove the little gold plated piece and connect your
Onkyo to the mids and tweets on the top connector. Hookup a
separate amp to the pre-outs on the Onkyo and hook it up
to the bottom connectors. You'll have to play around with levels
a bit to make sure you are balanced top to bottom.

HTH,
-Don
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Old 29th August 2008, 07:40 PM   #9
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After reading some more about crossovers, I have another question:

The speakers I'm using have second order filters, which (as I understand it) can cause some strange effects in the phase of the sound. How should this be handled in a biamping situation?
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Old 29th August 2008, 08:01 PM   #10
HK26147 is offline HK26147  United States
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When you say strange things, do you mean the 180 degree phase reversal of a 2nd order Xover?
If so, it is a simple matter of reversing the polarity to the tweeter.
Many active xovers has polarity reverse switchs for such a situation.
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