Define high current amp?


This may be a very rudimentary question, I'm just trying to learn:

I've fallen in love with electrostats, and am contemplating Magnepans or Soundlabs. The Martin Logan's I've heard are dark and ill defined to me (just my ears' opinion).

In selecting upstream equipment, I keep reading on these forums about planars requiring an amp with high current output to do their best.

In what specification for an amp would I be looking to select a high current amp? Is there a particular threshold of this spec which defines high current vs. low? I'm a little confused, as I have an old Yamaha integrated, and have been told a couple of times it puts out high current, but would like to know how to definitively compare this characteristic of different amplifiers.

Thanks in advance.
timwat

Showing 1 response by 6bq5

In 'Theory' a High current amp is an amp that is capable of delivering significantly "higher" current than standard design practices would dictate. For example a 'typical 100 watt amp would produce 28.5 volts at ~9 amp into a fixed 8 ohm load, and a 'high current amp' might do the same but be capable of delivering 11 amps.
THe discussion, as noted very well above is somewhat specious, as the current draw will be different from the current capacity, and you don't really want to see full current via a dead short, which may lead to a dead amp.
Tube amps are current limited by the output transformer [ OTL amps by the circuit]. Most of the "high-current" designs are Solid State, and are either (as mentioned above) down-rated amps, or amps with abnormally oversized power supplies; either way unless your speaker wants it, the amp won't deliver it, irrespective of the MFG claims.
Try an amp that sounds good - to you!- and that you can afford.
Happy listening