Re: What about Transcendent Sound?

12.10.248.50

Posted by Bulla on November 1, 2002 at 08:57:52

In Reply to: Re: What about Transcendent Sound? posted by Leisure7 on October 31, 2002 at 10:10:11:

There are two tests you can run to determine the stability and frequency response of your amp into capacitive loads such as a Quad.

First, connect a 2uf cap in parallel with an 8ohm 100W resistor. Feed a 10kHz square wave into it. Look for ringing. If it exists, DO NOT use this amp with the Quad. It will *eventually* arc the Quads. I haven't done this test with Atmasphere's, but I have with the Transcendents and they pass this test quite well.

Second. Feed sinewaves for each third octave from 20 to 20k into the amp and Quad. Measure for constant output at each frequency from the sinewave generator into the amp. Measure the Voltage at the speakers. Convert each measurement to dB. They should be at least within 1db of each other. Frequency SHOULD NOT alter with impedence or you will have gross tonal imbalances. Atamaspheres didn't do as well with this as the Transcendents did. You certainly don't want uneven frequency response into your Quads!

You seem to suggest that higher output impedence is desirable from an amp into speaker such as Quads. I don't get it - if output impedence is higher, and speaker impedence is higher in the bass, then you get even better damping factors. This can only be a good thing, as long as the Voltage output of the amp does not vary with speaker impedence (of course, current will vary).

Any damping factor of less than around 10 is going to give you very uncontrolled bass. this is simple physics. Did I not understand something in your text?

Also, the T8 Transcendent amp you refer to has, I believe, 22, not 33dB of feedback.

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Re: What about Transcendent Sound? - Bulla 08:57:52 11/01/02 (1)

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