BI WIREING

[John1964]

Hi, excuse my bad hifi knowledge, iv'e got Qed silver anniversary bi wire bi amp cable, 4 terminals one end and 4 terminals on the other end, 2 sets of course. My question is can i use this cable to bi wire the four terminals on my mordaunt short 902i speakers, using the A and second B posts on my cambridge audio 640 A amp, and would it make any difference if you can.

 

[Al ears]

I would not bother, not sure if those A and B posts are useable at the same time or not.
You could join the speaker cable pairs at the amp end and just run from A.

 

[Gray]

Find out if your A and B terminals are parallel wired (they probably are).
Do that by sticking a single twin cable into just pair B, then run it to your linked speaker terminals. Switch 'speakers A and B' on. If you're speakers work (with pair A unconnected) then you're OK to use all 4 terminals at the amp end - remember to remove the shorting links at the speakers.
No comment on the 'benefits' of bi-wiring, but as you've got 4 cores with plugs already fitted........you might as well.

 

[John1964]

I would not bother, not sure if those A and B posts are useable at the same time or not.
You could join the speaker cable pairs at the amp end and just run from A.

Thanks for that, and save me buying a bi wire cable.

 

[Al ears]

Some amplifiers will only deliver half their rst

Thanks for that, and save me buying a bi wire cable.

I thought you said you already had some?
Your A and B terminals are there so you can power two pairs of 8 ohm speakers.

 

[John1964]

Find out if your A and B terminals are parallel wired (they probably are).
Do that by sticking a single twin cable into just pair B, then run it to your linked speaker terminals. Switch 'speakers A and B' on. If you're speakers work (with pair A unconnected) then you're OK to use all 4 terminals at the amp end - remember to remove the shorting links at the speakers.
No comment on the 'benefits' of bi-wiring, but as you've got 4 cores with plugs already fitted........you might as well.

Thanks, before i try that probably tomorrow, There is no A switch, just the 4 A terminals and the 4 B terminals and the speaker B switch on the front panel to run a second Pair of speakers at the same time as the speaker A terminals i presume. Does that help in your reply anyway, i can still try your method if necessery.

 

[Gray]

iv'e got Qed silver anniversary bi wire bi amp cable, 4 terminals one end and 4 terminals on the other end, 2 sets of course.

If you actually do have the above cable John, you can connect it to all 4 terminals on each channel of your amp
(no need to check first - the user manual makes it clear that there will be no problem).

Wire the L & R channels identically:
Amp A terminals to speaker HF (upper) terminals.
Amp B terminals to speaker LF (lower) terminals.
Shorting links removed on both speakers.
Switch the B speakers on using the front panel switch.

Check all is working, with full-frequency sound.
Note that if you switch the B button off, you will hear only the tweeters of each speaker (a quiet, tinny sound) so leave it on.

You will then be bi-wired. Plenty of people will happily tell you there's no audible benefit to bi-wiring whatsoever.......but you already had the terminated 4-core cable.
Your alternative would be to leave 2 cores per channel swinging unconnected - and that really would be silly.

 

[John1964]

If you actually do have the above cable John, you can connect it to all 4 terminals on each channel of your amp
(no need to check first - the user manual makes it clear that there will be no problem).

Wire the L & R channels identically:
Amp A terminals to speaker HF (upper) terminals.
Amp B terminals to speaker LF (lower) terminals.
Shorting links removed on both speakers.
Switch the B speakers on using the front panel switch.

Check all is working, with full-frequency sound.
Note that if you switch the B button off, you will hear only the tweeters of each speaker (a quiet, tinny sound) so leave it on.

You will then be bi-wired. Plenty of people will happily tell you there's no audible benefit to bi-wiring whatsoever.......but you already had the terminated 4-core cable.
Your alternative would be to leave 2 cores per channel swinging unconnected - and that really would be silly.

Hi Gray, thats how i had it with 2 cables unconnected. Just followed your instructions , swithed on the B switch and all is sounding superb, thanks for your help much appreciated.

 

[Gray]

...all is sounding superb

Good, enjoy your music John.

And have some bedtime reading:

Bi-wiring Speakers: An exploration of the benefits -

(Bi-wiring Speakers) Bi-wireable loudspeakers have been available since at least the late 1980s and are now quite common. You can easily tell if your spea

www.qacoustics.co.uk