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Marantz MM7055 - Anyone using it with 4 ohm speakers?


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#1 of 2 OFFLINE   jeffpell

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Posted August 24 2013 - 06:58 AM

I'm just curious if anyone is having any success with 4 ohm speakers using a Marantz mm7055 power amplifier.  The manafacter claims that it will blow eventually.  Is that just at extremely high levels? 

 

I'm currently running a marantz sr7007 with monitor audio RX8s which run at 4 ohms, GXC150 which runs at 8 ohms, and RX1s which run at 6 ohms.

 

Thanks in advance for any advice.



#2 of 2 OFFLINE   schan1269

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Posted August 24 2013 - 07:39 AM

Most of the time, the issue with 4ohm is nothing more than misunderstanding gain...vs volume control. Technically not the same thing.

Taking out class D amps(for home use), because they inherently are just plain unstable below 6...

Any amplifier that does not list a 4ohm wattage rating basically is telling you...

"I can only produce X amount of power". That amount of power has different levels of gain required to produce it.

Ie...a given 100 watt amp at 8 means...

At 4 it produces 100 at roughly 50% gain.
At 6 it produces 100 at roughly 75% gain.
At 8 it produces 100 at roughly 100% gain.
At 16 it could produce 100 if it had 200% gain.

Yes, there are 16ohm speakers(Zu Audio being one brand with a range of 12-18ohm)

Therein lies the problem. People asking too much from the amplifier. With many amp/AVR makers, "you used 4ohm speakers" is just a warranty deny excuse.




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