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Old 22nd February 2003, 11:37 PM   #1
Jean is offline Jean  United States
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Talking Just bi-amped my speakers.

Hello,

Last night I added two more channels to my amplifier chassis. I was using a stereo p3a for a couple months now with diy 2 way speakers. I wanted to try bi-amping, and now I can clearly hear the difference with my own ears. I have 2 p3a channels going to the tweeters, and the other two going to the midwoofers.

The first thing that I noticed when I bi-amped one side and left the other alone is the improvement in bass. After listening to spanish harlem by rebecca pidgeon a number of times, I noticed that the bi-amped side sounds more open. Her voice seems to be more forward compared to the single amp speaker.

I played Scott Ambush - Down The Wire next. To my ears, bi-amped side does not run out of breath when pushed hard. When the bass solo and drums are present, speaker stays put and plays with authority compared to a single channel side.

Anyway, just wanted to say if you have a chance to bi-amp go for it

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Old 22nd February 2003, 11:56 PM   #2
7V is offline 7V  United Kingdom
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Excellent Jean.

Could you tell us about the crossovers? What is the crossover frequency and are you using active, passive or passive line stage?

It would be interesting to know exactly what causes the improvements. I wonder what it would be like with one amp that had double the power. Also, I'm not familiar with the p3a but I believe that with the biamping configuration each amplifier can operate more in class 'A' mode. Am I right?

Anyway, more power to your elbow (and speakers).

Steve
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Old 23rd February 2003, 12:17 AM   #3
Jean is offline Jean  United States
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Hello 7V,

Crossover is 2.2 mH, 10uF on the pl18wo and 5.6uF, 0.56 mH, 5 ohm in parallel and 10 ohm in series on ss9500 tweeter.

I'll let somebody else answer your question on p3a operating in class A mode, because I don't know
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Old 23rd February 2003, 12:45 AM   #4
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how did you crossover on the bi-amped side?
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Old 23rd February 2003, 01:34 AM   #5
Jean is offline Jean  United States
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Quote:
Originally posted by audionut
how did you crossover on the bi-amped side?

The output of each amplifier channel goes to the passive crossover components. ch1 -> left low pass, ch2 -> left high pass and finally to the components. I have crossover components just relaxing on top of the speaker cabinet since I am always changing things. Each cabinet has two sets of binding posts for ease of wiring.
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Old 23rd February 2003, 01:37 AM   #6
JBL is offline JBL  Canada
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Hmm you will see an even better diference if you use an active crossover. As the greatest benefit IMO of bi-amplifing is the ability to remove the passive x-over.

You should give it a try.
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Old 23rd February 2003, 01:44 AM   #7
Jean is offline Jean  United States
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Quote:
Originally posted by JBL
Hmm you will see an even better diference if you use an active crossover. As the greatest benefit IMO of bi-amplifing is the ability to remove the passive x-over.

You should give it a try.

Thats my next step
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Old 23rd February 2003, 04:09 AM   #8
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Ive been thinking about these for biamping a set of my speakers:

http://www.adireaudio.com/diy_audio/...ctive_home.htm

I was thinking of making a sort of poor mans HD-1.

One of the advantages I like about this solution is being able to absolutely minimize the length of the speaker cables.
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Old 23rd February 2003, 04:36 AM   #9
cm961 is offline cm961  Canada
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Hi guys,

I just finished my bi-amping project, and boy what a difference. One day at school between classes I drew up the plans for the system, and I had the entire thing complete within the week... My fastest project ever. And I think its my most sucessful as well.

The difference is amazing. There is a lot more clarity in the high end, more eveness in the low end and lower bass. I think the main reason I benifited so much from the change was due to the active crossover I used. I previously had a bi-polar electrolitic for the tweeter, and although I have limited experience with crossovers, I think bi-polar electrolitic isn't the way to go (I'm sure all will agree).

The speakers are two way, with a 5-1/4" mid-bass and a lower end vifa tweeter. I'm very happy with the tweeters for what they cost and also the small woofers.

Anyways, I'm rambling, but the point is that bi-amping is amazing, even though the four amplifiers I'm using are just LM12 op-amp based.

Pete
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Old 25th February 2003, 12:08 AM   #10
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Default I was thinking of making a sort of poor mans HD-1.

Not to change the subject too drastically but what is your experience with Meyer Sound HD-1's?

I have a pair but haven't seen much discussion about them on this forum. Perhaps I'm doing my search wrong.
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