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Running 4 speakers from a 2-channel amp

I love the sound of 4 speakers playing at once around me. I've got a simple old SS amp, Luxman L507 (mid-1970's) that runs 4 speakers at once. I'm running a pair of Yamaha NS-1000x (6 Ohm) as mains, and a tweaked set of B&W 805Ns (8 Ohm) as B's.

I'm talking here about 2-channel sound, 4 speakers, not 4-channel surround sound.

I've been looking for a higher-end amp, but find almost all are two-channels only, with ports for only two speakers.

Some great old Luxman tube amps offer 4 channels, but only one pair at a time is available on the selector ("A or B," not "A and B"). One shop told me they could have one modified for me to be able to play 4 speakers, at only a small cost.

Another shop told me that playing 4 speakers at once, even on my current old Luxman, which has the "A and B" option, overburdens the amp and shortens it's life.

I wonder - can't we wire-up 4 speakers, say two on each side in parallel, like in so many car stereo setups?

Am I really limited to only 2 speakers with a 2-channel amp?
jimthewebguy

Showing 2 responses by kijanki

kijanki's avatar
kijanki
4,479 posts
 
AL - I would never connect speakers in series but I believe DF doesn't suffer - at least with woofers in series within the same box. It appears that each woofer sees impedance of the other woofer in series (JBL wrote paper on that - that is incorrect) but in reality EMFs are in opposite phase and cancel. If amp's output impedance is zero - it looks like two woofers are connected in parallel in opposite polarities (EMFs cancel). Connecting woofers in series makes sense only when they are identical (for cancellation). Connecting speakers boxes in series will be a mess.

More info here: http://www.cartchunk.org/audiotopics/SeriesSpeaker.pdf

or here: http://www.monstercable.com/mpc/stable/tech/A2538_Wiring_Woofers.pdf
kijanki's avatar
kijanki
4,479 posts
 
Kirkus - I remember seeing large bass guitar stacks that had a lot of small (about 10") speakers (10-12). They must have been connected serial/parallel to obtain any drivable impedance.

I've read on this forum that before SS popularity speakers/drivers had very high impedance (16 or even 32ohm). Maybe it was to match better with tube gear but it could be for other reasons. Lower impedance allows to squeeze more power from SS amps.
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