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156.72.30.1
In Reply to: RE: Bi-amp fail and Amy Winehouse posted by neolith on January 31, 2017 at 19:55:20
I follow your comments about the parallel inputs to the speaker not interacting through crossovers in the speaker. I am confused as to your comment about it needing to be line-level. I split the output to the amplifier channels at the preamp audio out RCA jack, is this not line-level? Where else can I split the signal for each channel to get the bi-amplification of the speaker?
If I am understanding correctly, are you suggesting an external crossover that splits the high and low frequency from dual amplification for each channel prior to connection to the speaker?
And so... Output from two amp channels into left and right external crossovers, then dual outputs to the high and low frequency speaker posts?
Seemed to me that the internal crossovers would handle the full range inputs from the amplifier to the high and low freq posts and voila!, great sound. To me, it seemed more of a phase coherence problem - cables not perfectly matched or amp channels not identical.
Sorry if I seem confused... want to learn from my mistakes. Prob my next move is to call Revel..
Thanks for your feedback!
Follow Ups:
If I read your post correctly, you are taking the full signal from the preamp and splitting it into two parallel but identical signals. For the most part this is fairly innocent but this is not a crossover*. From there each amplifier is fed a full signal and only when the signal reaches the speaker crossover is the signal divided into high and low frequencies.
Here is a diagram of a vertical active biamp setup which uses to identical amps:
and a diagram of a horizontal setup which is generally used if the amps are different but could be also be used for identical amps.
* I say fairly innocent because in the rare case of using a tube pre-amp [these typically have a relatively high output impedance (> 1 kohm)] with some SS stereo amplifiers that have low input impedances, the desired ratio of > 10:1 (load to preamp out) may not be maintained. Signal splitting puts the two amplifiers in parallel and the load impedance seen by the preamp is halved.
Specifically in your case the Halcro has 10K ohm impedance which when split puts a load of 5000 ohms on your preamp that has an output impedance of 300 ohms (unbalanced). This means the ratio is 17:1 - this should be ok. However if you are using the balance connectors then the preamp impedance is 600 ohms and the ratio would drop below 10:1.
I married the perfect woman. The downside is everything that goes wrong is my fault.
Edits: 01/31/17
You have summarized my prior "bi-amp" setup correctly. Counted on the speaker network to handle the crossover duties. If one feeds the speakers from an external crossover, as your diagrams show, wouldn't the resulting signal be subject to additional filtering in the speaker?
Anyways. Probably gonna walk away from this one. The sound without "bi-amping" is so wonderful that I pray that nothing breaks for the rest of my life! (haha)
Thanks again for your help. Great diagrams and you clearly looked up the specs on my equipment, so thank you for that too!
Best wishes!
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