What do these specs mean?


Silver Member
Username: Brynm

Prince Albert, SK Canada

Post Number: 178
Registered: Jul-05
Less than 1% THD
(I know it's harmonic distortion and you want a low number)

Signal-to-noise ratio:70dBA (Reference 1W into 4 ohms)
(do you want a high or a low number?)

Effective Damping Factor: 6.348 @ 4 ohms
(is this good/bad what do you want for a sub?)

Silver Member
Username: N2audio

Lawrence, Ks USA

Post Number: 358
Registered: Mar-04
THD - It's simply the unwanted noise introduced into the signal by the amp. Every amp injects SOME noise. Theoretically lower is better, but except for the cheapest of the cheap THD isn't going to be an audible factor.

S/N - again - you can measure it, but there's not an amp built today with a S/N ration bad enough that it's going to make a difference in a car.

DF - well, this might be the most useless of all because it's completely subjective. Typically, higher is considered better, but some $1,000+ tube amps have DF's in the single digits and are considered excellent SQ amps.

Silver Member
Username: N2audio

Lawrence, Ks USA

Post Number: 362
Registered: Mar-04

Gold Member
Username: Carguy

Post Number: 5229
Registered: Nov-04
Here's a general guide.
THD: lower is better
S/N: Higher is better
Damping Factor: Higher is better
Slew Rate: Higher is better
Channel Separation: Higher is better
Frequency Response: Wider is better

If you want to study specs, try Zapco.com and Pyramid/Sony.
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