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Toroid vs E-core/ multi-channel amps vs flagship rcvrs (1 Viewer)

Joined
May 22, 2002
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18
Rotel, parasound,marantz,etc (any of the lower priced multi-channel amps)
-do all of the above amps use Torroidal transformers or do some use E-core(etc.)??????
I seem to remember that some flagship rcvrs use toroids and some do not(Elite 49?)....
Given that the pre-pro part of a rcvr doesn't take much current ,I would like to see current draw specs on some of these amps vs that of flagship rcvrs...anyone have this info?
 

Aslam Imran

Second Unit
Joined
Mar 1, 2002
Messages
286
Usually the spec sheet has the max current draw info. For example:

Denon 5803 (170Wx7) owners manual states the max consumption is 12 Amps and the B&K 5125 (125Wx5) has a max consumption of 12.2 Amps. So you can see that the Denon, inspite of claiming higher output in 7 channels consumes less current than the B&K that has a lower output in fewer number of channels. Ironic isn't it?
 

Samuel Des

Supporting Actor
Joined
Feb 7, 2001
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796
What's interesting is that the Rotel RSX-1065 HT receiver is rated to consume 550 watts. The rated output is 100x5 from 10 to 20kHz. The RSX-972 HT receiver is rated to consume 850 watts. The rated output is 75x5 at 1kHkz. What is up with that?
 

ChrisAG

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Aug 26, 2001
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According to the Marantz Website, the high-end receivers and amps use Torroidal, while the mid-level don't.

If you wouldn't mind explaining, what is the difference between the two?
 

Mark Tranchant

Stunt Coordinator
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May 9, 2002
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126
My Marantz SR4200 uses an E-core transformer.

The toroid is ring-shaped (hence the name) and is claimed to have a better contained magnetic field, leading to less interference and lower physical vibration.
 

Aslam Imran

Second Unit
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Mar 1, 2002
Messages
286
Mark, actually torroids have more vibration to them but they are more efficient weight/powerwise and do have better contained magnetic fields.
 
Joined
May 22, 2002
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18
Generally speaking, Toroids are better...but my curiosity is to whether or not certain flagships draw moree "peak" current than lower end multi-channel amps......actually , the 5803 vs 5125 info posted above is about what I would have expected...the B&K Ref7270 draws quite a bit more than the 5125 though...also ,could someone qualify "current limiting vs non currenting" rcvrs?????
 

Aslam Imran

Second Unit
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Mar 1, 2002
Messages
286
All receivers are current limiting and most of the separate amps are not. Current limiting circuits are built in receivers to protect their output devices from blowing up under demanding conditions.
 

Aslam Imran

Second Unit
Joined
Mar 1, 2002
Messages
286
I am sure the other flagships are current limiting. There might be others like Mac that make receivers that are non-current limiting, but these like the B&K are more of a separates manufacturer. I am sure all the mass-market manufacturers have current limiting receivers, flagships or otherwise.
 

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