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RE: Running out of steam

Posted by Charles Hansen (M) on August 26, 2007 at 09:49:06

In Reply to: REVIEW: Vandersteen Audio 2Ce Speakers posted by Rufipennis on August 25, 2007 at 22:12:59:

<< At very high SPLs (much higher than I like to listen), the Sig IIs become very congested. Although to be fair, I’m not certain that it isn’t just my Ayre integrated running out of steam driving these somewhat inefficient speakers. >>

It's probably the Ayre running out of steam. Here are the numbers:

a) The CX-7e has an output level of 4.5 Vrms when using the balanced outputs and the disc is playing full scale (fairly common with rock recordings).

b) The AX-7e has a maximum output level of 22 Vrms before clipping.

c) This means that you can run a maximum gain of 22 / 4.5 = 4.89x, which is about 14 dB, before it will clip with a full scale output on the CD.

d) Since the maximum gain of 35 dB is achieved at an indicated "66" on the front panel, and each displayed unit is 1 dB, then you will reach clipping at an indicated "45" on front panel of the AX-7e in your setup.

Your ear can handle brief clipping without too much problem. So you might be able to get into the high 40's without too much problem. But by the time you reach "50" on the display (with this particular combination of equipment), you will definitely be clipping when playing a rock recording. (Classical recordings are often cut at lower levels.)

Hope this helps.

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