|
Planar Speaker Asylum Welcome! Need support, you got it. Or share your ideas and experiences. |
|
|
|
Planar Speaker Asylum Welcome! Need support, you got it. Or share your ideas and experiences. |
|
In Reply to: Why bi-amp Mags? posted by steve.sukiennik on July 21, 2017 at 08:16:57:
Your advice from Heath Audio is not on point and misses the main point.
The main issue addressed by biamping is decoupling the power supplies (and output stages) running bass from those running the mid and tweeter. Everything else is less significant.
The demands of producing low frequencies are provision of high currents over prolonged periods. The demands for higher frequencies are fast response, dynamic voltage/power (usually measured over 20 or 200ms) and lack of distortion. Providing these in a single amplifier is very expensive as the linear power supply will start to compress as it operates outside of the linear region up to 1/3 of its rated output much of the time while playing bass. To make full use of the power delivery of the supplies and save the largest cost in an amplifier, feedback is used liberally and often aggressively to linearise the power supply sag, which compromises transient/time domain performance.
Building one amp for the top end and one for the bottom end allows the top end amp to operate at the lower portion of the power supply's capacity most of the time or use the power supply and heat dissipation capacity to operate in class A most of the time, and allows the use of high feedback amps at low freq to save 70% of the transformer capacity - which reduces expense by a factor of 4.
Where some highly sensitive people have problems is in coherence between the two amps being used. That can be addressed by careful selection of amps to match each other and tuning of the crossover if that does not prove sufficient in removing obviously audible transitions from one amp's operation to the other's.
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- RE: Why bi-amp Mags? - Satie 12:17:44 07/21/17 (0)
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2025, Audio Asylum, all rights reserved ]
