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Old 1st September 2002, 06:12 AM   #1
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Default Preamp Numbers; good, bad, ugly?

Please comment on the following specifications of a line amp.

Bandwith(-3db) = 0.5/200Khz per ch
Maximium output (10k ohm load) = 9.6V
Maximium output (600 ohm load) = 9.0V
Separation (1kHz) = >115 db below right ch
Separation (20kHz) = > 100 db below right ch
THD (20kHz @ 3 volts out @ 10 k load) = <0.001%
Noise - ref. 1 volt out (20kHz Bandwith) = -120db
Line voltage Min 100 Max 144
D.C. Volts out +/- 22.6V
A.C. ripple + noise +/- 170uV

Good, Bad, Ugly or impossible?

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Old 1st September 2002, 08:39 AM   #2
skaara is offline skaara  Slovenia
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Use your ears to tell you I cant say anything.
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Old 1st September 2002, 08:55 AM   #3
trwh is offline trwh  United Kingdom
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Chris, these numbers are fine, there's no reason why it shouldn't sound good when built.
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Old 3rd September 2002, 04:44 PM   #4
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Actually those are the numbers provided by the manufacturer whom built the pre-amp himself by hand one at a time in his comercial outfit. I bought one from him and it sounds, well like no sound or character I can distinguish. But I am not sure whether he did actually take the measurements or just copied from some other documentations.

Thanks for your comments.
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Old 3rd September 2002, 04:49 PM   #5
tiroth is offline tiroth  United States
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Kind of funny when noise is spec'd at 1uV (pretty darn hard actually) and hum is +44dB more than that. You'd think if someone spent the time to get the noise figure so low they would pay some attention to supply filtering.
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