Is it Ok to mix 4ohm Speakers and 8ohm Speakers on a Marantz SR6007?

[SonomaComa]

I purchased a Marantz SR6007 AVR and two Martin Logan Motion 4 bookshelf speakers about one year ago. I have them in a bedroom connected a 70" TV. I placed those little Martin Logan Motion 4 speakers on stands right at the foot of the bed and they sound great to me, excellent for dialog during movies, exceptionally clear. But they are 4ohm speakers. I just purchased two Klipsch Icon KF-28 Floor Speakers and they are 8ohm. I picked them up for $250.00 normally they are $450.00. Those are the only speakers I have right now.
My question is, (without hurting anything), is it Ok to hook up both 4ohm Martin Logan bookshelf speakers at the same time for use as one Center Channel Speaker and use the 8ohm Klipsh Floor speakers for the two Main Speakers? Would the Audyssey MultEQXT on the Marantz SR6007 be able to deal with that situation? Would it run hot or anything?


Marantz US | SR6007
http://www.martinlogan.com/pdf/manuals/manual_motion_2_motion_4.pdf
https://www.klipsch.com/kf-28-floorstanding-speaker/details

 

[JohnnieB]

If you know how to wire the ML in series, you would present an 8 ohm load to the amp. Should be ok, but not sure they would sound as good as they did wired individually. If you happen to wire them in parallel, you present a 2 ohm load to the amp, not good. Best buy has the Klipsch KC-25 center on sale for $150 right now, like 40% off. If it were me, i'd run (phantom mode) with Klipsh on the front, ML rear channels. Ideally get the center at 40% off and have a matching front L/C/R.

 

[Pyrrho]

To the general question of whether it is okay to hook up different impedance speakers to different channels of a multichannel amplifier (in this case, the amplifiers are built into a receiver, but that is irrelevant to the question): It is fine as long as the amplifier is capable of dealing with the lowest impedance speaker. Thus, for example, with an amplifier that can drive 4 ohm or higher impedance speakers, you can hook up a 4 ohm speaker on one channel and an 8 ohm speaker on another channel, and that will not hurt the amplifier at all.

For what you are planning on doing, you should use just one speaker for the center channel. Otherwise, you are likely to get acoustic interference and comb filtering due to the sound from each being slightly out of phase for some frequencies as heard from the listening position. Also, if you hook up two 4 ohm speakers to the same terminals, you will be wiring them in parallel which will present a 2 ohm load to your center channel amplifier. Unless that amplifier is okay with 2 ohms, you risk damaging it with such a low impedance.

So, use only one speaker for the center channel.

 

[melody3310]

Couldn't agreed more. Very helpful and educated.