Results 1 to 3 of 3

Thread: 4 ohm specs for Marantz, Denon and Onkyo AVR's

  1. #1
    ZEN
    ZEN is offline Audiophyte ZEN is a forum member in good standing
    Join Date
    Jan 2011
    Posts
    6
    Thanks Given
    1
    Thanks Received
    0

    Default 4 ohm specs for Marantz, Denon and Onkyo AVR's

    Has anyone seen 4 ohm rms power specs on these receivers. I know it depends on how many channels are driven, but in reality the LRC speakers are the primary speakers that are driven hard and have larger speakers. Back LR are usually small speakers and many Subs are active amplified.

    Can anyone share their info?

    I realize some people decide one unit is better than another because it weighs more. This may not take into account lighter switching PS and class of amplification.

  2. #2
    GranteedEV's Avatar
    GranteedEV is offline Audioholic Ninja GranteedEV should be listened to
    Join Date
    Jul 2009
    Location
    Calgary, Canada
    Posts
    4,485
    Thanks Given
    1,967
    Thanks Received
    2,034

    Default

    Here's Gene's measurements for the Marantz SR6004:

    http://www.audioholics.com/reviews/r...4-measurements

    It should give you an idea of the x003 and x004 series. The x005 series does have a bit of a different amplifier section from what people have said.
    System: Marantz SR6003
    ---> Crown XLS 2000 ---> Philharmonic Model 2
    ---> Tapco Juice J2500 --> DIY Maelstrom X


    Victory goes... TO THOSE WITH COURAGE!!!

  3. #3
    PENG is offline Audioholic Spartan PENG should be listened to
    Join Date
    Oct 2004
    Location
    Ontario
    Posts
    5,329
    Thanks Given
    1,217
    Thanks Received
    1,444

    Default

    Most upper mid range Dennon, Yamaha, Marantz models can handle 4 ohm nominal speakers. They don't specify it but if you read Denon FAQ for example, they say it is okay. They do let you know that if you drive the speakers hard and loud the protection system may activate. In reality it depends on your room acoustic condition, how loud you listen, the type of music you listen to (e.g. classical music has more dynamic range), and the load characteristics of the speakers. Nominal impedance is one key factor but the graph of phase angle and impedance vs frequency will also be necessary to really determine if the AVR can do a good job on your speakers.

    If you don't want to consider all those factors I mentioned, then instead of going for a 140WX7 AVR, you may be better off going with a lower price AVR such as the Yamah RXA2000, Denon AVR3311, plus a 3X300W Power amp for the LRC, or go with a Marantz AV7005 plus Emotiva UPA-7 ($599). IMO, the mid range AVR+XPA-3 will get you more bang for the bucks, especially if you can live without 3D, the Denon AVR4310 is going for <1K, $1,999 only a year ago. 4310+XPA-3 will drive your 7.1 4 ohm system unless your room is exceptionally large and you listen at >90 dB SPL all day long.

    You cannot always go by weight, depending on the design, some amps are lighter but not necessarily less powerful. For example, the Bryston 4B SST, or SST2 weights less than 55 lbs but are as powerful as the 75 lBs XPA-2. There are many other examples, the Marantz MM8003 (rated for 8 ohms) has a massive (600VAX2) toroidal transformer in it, same size as that in the XPA-5, yet it weights only 39.5 lbs vs the XPA-5's 66 lbs. The fact is, the MM8003 does not have much steel mass in its chassis. It also has fan (s) in it so it may cut back on heat sinks whereas Emotiva appears to use steel extensively in their products, they build them like a tank. I suspect they may be assocated with some steel manufacturers.

    Basically weight is a useful indicator for comparing class A/B amps in general, but to me 35 lb seems to be the magic number. A >35 lbs AVR could (not always, and often not the case) be every bit as powerful as a 55 lbs one.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •