Amplifier specs, does they matter?


For solid state designs, the manufacturers boast about their signal to noise ratios, total harmonic distortions, slew rates, frequency responses, and many others. Meanwhile, the makers of the tube amps praise the liquidity and musicality of their designs. Obviously, amplifiers with tubes don't measure nearly as well as solid state amps. So, do any of these specifications really matter?
psag
Yes, specifications are important and do matter, in many ways.

All electronic devices, for example amplifiers are designed and constructed based on specifications first. This is Engineering 101. Design and build an audio power amplifier, with a minimum frequency range of 20 HZ to 20kHZ, power output into 8 Ohms of 250 WPC, harmonic distortion not to exceed 1%, output impedance of x and input impedance of Y. There are other specifications given to the designer, but, these are characteristic.

Specifications with regards to the end user depends on who the end user is. Military useage is different than the average audiophile. For Military, it better meet or exceed the desired specs. For the Audiophile, what exactly do you need to know? 1. Power output over the frequence range, 2 Input impedance, 3. Output impedance, 4 distortion, 5 operating frequency range, 6 load impedance it is designed to handle.

So, yes, specifications are important. If you purchased some relatively inefficient speakers, that have an operating impedance going down to 1 ohm, are you going to pay attention to the specs of the proposed amp? I should hope so. Distortion below 1% is very good in todays standards. But, high distortion is something I want to know about. The amp should be an infinite bus over frequency that amplifies the signal with zero change to the signal. That is what an amplifier is supposed to do. So, yes, distortion ratings are important. However, some manufacturers taylor their designs to a certain sound, read "this adds certain acceptable distortion to the signal" to achieve a certain sound. Too much distortion is just poor design.

enjoy
At least one company claims that their really-fast negative feedback loops eliminate the problems traditionally associated with negative feedback.

Just when you thought you've heard everything...
Spectron, Soulution, I'm sure there are others. I guess they should have spoken with you first.
I really like Onhighway61s response, particularly
The information won't tell you how the amp will sound, but it will tell if it can operate properly in your system.
IOW, use certain specs to rule out an amp in the context of your speakers and pre-amp, but from there, their usefulness is questionable for a variety or reasons.

I also endorse the use of weight when comparing otherwise similar amps because of what it tells you about output xformers and power supply. Of course, its non-scientific and is not applicable to OTLs ;-)
Well, I'm talking about two-channel only. And I'm not sure that the color of the amp is critical here. Unless its flaming red-orange.