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Connecting 6 ohm and 8 ohm speakers to the same receiver (speakers A, B and/or A+B)

I have vintage ADS L-710's that operate at 6 ohms and recently purchased a pair of BIC DV62si that operate at 8 ohms.

I would like to utilize both sets of speakers in a stereo set up on a single receiver.

I have a Luxman R-1040 purchased in 1978 which, other than a cranky right channel, is still going strong. It will drive A or B discretely and has an A+B option for driving four speakers

I also have recently purchased an NAD 7220 which has the option of either 4 or 8 ohm delivery, and a switch for A discretely or A+B.

Any suggestions or warnings concerning either of these receivers and these speakers in the desired scenario?



Connecting 6 ohm and 8 ohm speakers to the same receiver ...

Personally, I doubt that any audio amplifiers would suffer any ill affects with a slightly different impedance load, especially considering the fact that speaker impedance is a variable over the usable frequency range.

Connecting 6 ohm and 8 ohm speakers to the same receiver ...

Thanks, Johnnysan! I am new at this and felt that this was a mute point (so to speak), but wanted to make sure.

You have confirmed what I had receive from another source.

Thanks again.

Connecting 6 ohm and 8 ohm speakers to the same receiver ...

When You connect these two pair of speakers to amp, the total impedanz will be lower
than recommended by Luxman.
1/8 + 1/6 = 1/Z, meaning impedanz whould be 3,43 ohms.(speakers in parallell)

In servicemanual the outputpower are only refered to 8 ohms. (servicemanual page 19)
4 ohms are not mentioned so Im not sure if Amp-stage are meant to take such
a low load.
Normally old amps take between 8 and 4 ohms, and always couple A+B in
parallell. (servicemanual page 20, bottom right)

Connecting 6 ohm and 8 ohm speakers to the same receiver ...

Gringo,

At this time I have them connected as described in the manual. Thank you this heads up as I was about to do a little speaker testing. I will not run the speakers simultaneously, but only A or B; not A+B which is an option on this unit.

Thanks, again.

mtsscholar

Connecting 6 ohm and 8 ohm speakers to the same receiver ...

You could try to switch to A+B, but be carefull when turning up the volume.
You might hear different loudness between A and B due to the different impedanz.
Your 6 ohms speakers whould normally sound louder than the 8 ohms.

My old Hitachi HMA-6500 are ment to work at loads of 8-16 ohms, although I
use a pair of Tannoy at 6 ohms and never had any problems.

Connecting 6 ohm and 8 ohm speakers to the same receiver ...

I may give it a try tomorrow or the next day.

I have been reflecting on the math and the quality of the Luxman which I believe could handle it for a short time.

In reviewing specs for a Parasound amp there were cautionary notes about pairing 4 & 8 ohm speakers simultaneously. They are against the idea and actively discourage it.

I found out what I wanted to know today by switching between the speakers: My 35 year old ADS L710's still have what it takes in presence, precision and transparency.

Thanks for sharing the advise. I consider this thread closed.

KJC