Amplifier Specs

Simplistically the easy explanation is: "slew rate" is how fast the amp reacts to signal and delivers the output power and is related to amp design and output device specification; "damping factor" is the ability of the amp to "damp" the motion of the speaker cone and is related to the output impedence of the amp and the impedence of the speaker. Damping factor is also effected by the amount of feedback used in the amp circuit. Hope this helps? regards, Richard at www.vantageaudio.com

Hi, Richard. Good to see you here. Thanks for the clarification. Are those numbers bigger the better in general? How about "negative feedback"?

Hello Ken. There are many factors involved in determing "damping factor" and it depends on circuit design, so sometimes bigger is not always better. Damping factor is roughly the ratio of amp output impedence v speaker impedence. So if the amp is, say, 0.1 ohm and the speaker is 8 ohms the factor is approx 80. Negative feedback is used in circuit to control devices, for example transistors, and ensure they give a reasonable performance under repeat conditions. It basically tries to overcome the inherent shortcomings of the device in question and give better performance figures. This is a very rough and ready explanation which I hope helps. Regards, Richard.

How much damping factor you need depends on the speaker you intend to use. Some speakers are specifically designed for use with tube amps that generally deliver low damping. Coupled with an amp with high damping factor will produce an over damped bass response, dry and muddled. I think it has to do with the Q factor of the woofer. Maybe someone out thier in Audiogon land has a better grasp of the tech aspect.Suffice to say, matching the right amp to a speaker can make a huge difference.