Should I have any trouble with impedance mismatch? My amp has a said impendance of 8 ohms in 2 channel mode and 4ohms in quad setting .I will have a pair of Epos Ls3 in a few days which are 4ohm. How should I handle it and what should I expect?
No bridging in this receiver, Skipper.
From your Marantz 4400 owner's manual, page 10/08:
"Note: . . . when using the 4400 in the 120W X 2 mode, do not use 4 ohm speakers - use 8 ohm or higher."
It also says, page 10/32:
"Do not use 4-ohm speakers if main and remote speakers are to be used simultaneously. Use 8 or 16 ohm speakers only."
Page 8 says:
"The 4400 can be used as a stereo or 4-channel receiver. When using the 4400 as a stereo unit, the Power Mode Switch on the rear panel should be placed in the 120W X 2 mode. The instructions contained in this manual are to be followed for both stereo and 4-channel operation; however, for stereo operation, the front channels alone will apply."
All of this leads me to assume the following power amp assignment:
- Front left amp - powers front left
main and remote speakers w/minimum 8 ohm impedance for
each speaker totalling 4 ohm for two speakers, main + remote
- Front right amp ; powers front right
main and remote speakers w/minimum 8 ohm impedance for
each speaker, totalling 4 ohm for two speakers, main + remote
- Rear left amp - powers rear left
main and remote speakers w/minimum 8 ohm impedance for
each speaker totolling 4 ohm for two speakers, main + remote
- Rear right amp - powers rear right main and remote speakers w/minimum 8 ohm impedance for
each speaker totalling 4 ohm for two speakers, main + remote.
In short, you may safely use your new four-ohm speakers for the two front ("main") channels (L and R, ie, stereo) in the 120W X 2 mode. There is no bridging of any of the four amplifiers in the receiver, so you may use 4 or 8 ohm speakers on the two "main" rear channels, as well. (The rear channels will be synthesized here.)
(Really cool feature note: each of the four channels are equipped with preout/main in connectors! I'd buy the receiver for that feature alone. Tons of flexibility in amp/preamp assignment.
)
Here is the important part: when using 4 ohm speakers in each of the four "main" channels, you
must not use any speakers at all in any of the four remaining "remote channels," which are typically used for setting up two or four channel sound in another room, anyway. So no loss.
All of this is rather clumsily and haphazardly explained in the 4400 owner's manual, found here:
https://www.hifiengine.com/manual_library/marantz/4400.shtml
GeeDeeEmm