VAC Amplifier Speaker Output Taps


My VAC amplifier has output taps labeled 2 to 4 or 4 to 8. I was wondering whether this means that the first tap is 3 ohm and the second 6 ohm. If my speakers are nominal 4 ohm with minimum of 3.2 ohms, is there a correct choice from a technical or electrical standpoint. I've tried both without appreciable difference in sound.
Thanks!
audiobrian

Showing 1 response by jmcgrogan2

Kevin has always advised folks to try both taps, as results vary from what one may expect. He claims that many times the amp may mate better with the minimal spec speaker impedance rather than the nominal spec. In my experiments this proved to be true. My speakers are a nominal 8 ohm load, with a minimal load of 6 ohm. I originally had them hooked to the 8 ohm tap and the sound was pretty good. However, when I changed to the 4 ohm tap, the sound really opened up and became much more palpable.

It is my understanding that the 8 ohm tap puts out more voltage, while the 4 ohm tap puts out higher current. It really is dependent on your speakers load, and design as to what will make them sing better. I suggest that you experiment with both taps as Kevin suggests, and choose the one that sounds best to you.

Cheers,
John