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Old 4th June 2010, 12:30 PM   #1
cjkpkg is offline cjkpkg  United States
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Default Bi-amping question

If I wish to experiment with bi-amping in order to split the preamp singnal to two signals do I just simply add a parallel L&R output from the preamp?

Preamp is a JFETBOZ.

My desire is to use one amp to drive the tweeters and another to drive the woofers.

As of this point my experiments will include:
JFETBOZ
Aleph Mini-A
F5
Zaph Audio SR71 bookshelf speakers

Thanks in advance
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Old 4th June 2010, 01:01 PM   #2
paulb is offline paulb  Canada
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You should use an active crossover. Better read this:
BiAmp (Bi-Amplification - Not Quite Magic, But Close) - Part 1
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Old 4th June 2010, 01:51 PM   #3
AndrewT is offline AndrewT  Scotland
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Hi,
stop.

There may be confusion here.
In the UK, bi-amping means using two amplifiers to drive the passive crossover in the two way speaker.

In the US, bi-amping seems to be used to mean creating an active speaker, using a line level crossover feeding 2amplifers, each amplifier directly connected to a driver with no passive crossover.

Which are you referring to?
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Old 4th June 2010, 02:07 PM   #4
cjkpkg is offline cjkpkg  United States
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using 2 amps to drive the passive crossover in a 2 way speaker.

the mini-A to drive the tweeters
the F5 to drive the woofers
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Old 4th June 2010, 02:27 PM   #5
AndrewT is offline AndrewT  Scotland
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Hi,
has boz used an output resistor to help stabilse the pre-amp when capacitive cables are used as interconnects?

If yes, then simply add a second resistor of the same value.
Take one feed from each resistor to the power amps.

If there are no resistors required at the pre-amp output then I suggest you add a pair of 51r. Again taking one feed from each 51r to the power amps.
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Old 4th June 2010, 04:08 PM   #6
Blues is offline Blues  United States
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I think it'll sound more balanced with the mini-A (higher gain) driving the woofer (lower sensitivity) and the F5 (lower gain) on the tweeter (higher sensitivity)...well just for kicks try it both ways to find out.
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Old 4th June 2010, 11:07 PM   #7
cjkpkg is offline cjkpkg  United States
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schematic I used...
Click the image to open in full size.
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Old 4th June 2010, 11:11 PM   #8
cjkpkg is offline cjkpkg  United States
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Yes, as far as which amp to drive what once I have the preamp sorted out it will be easy to experiment.

The biggest worry I think would be needing a pot on the mini-A due to the higher gain. Not a big deal though...
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Old 4th June 2010, 11:12 PM   #9
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Better to use B1 buffers with separate gain controls for hi/low
(which makes it a B2)

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Old 5th June 2010, 02:56 AM   #10
kzim229 is offline kzim229  United States
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Quote:
Originally Posted by Nelson Pass View Post
Better to use B1 buffers with separate gain controls for hi/ low (which makes it a B2)
speaking of the B2, any estimated time of arrival?

no pressure ...
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