Free Shipping on All Orders 1-866-764-1801

Vist our Online Store
+ Reply to Thread
Results 1 to 6 of 6
  1. #1

    Member Sales Rating: (28)

    Join Date
    Mar 2005
    Location
    Right here.
    Posts
    10,414

    Default 4-8 ohm Speakers same receiver/amp

    I made a search on the subject and the closest I got is this:

    http://www.polkaudio.com/forums/show...hlight=mix+ohm

    which talks about a receiver with an impedance switch.

    How about receivers/amps that do not have this switch? Specifically, is there any risk to the speakers or amp in doing this for:

    1.-HK 3480
    2.-Adcom 535

    Both have two speakers outputs; thinking in connecting 4 ohm in one and 8 ohm in the other. Only one output would be used. (There is always a possibility though of mistakenly keeping both..)

    Thanks.
    _________________________________________________
    ***\\\\\........................... My Audio Journey ............................./////***

    2008 & 2010 Football Pool WINNER
    SOPA

    Thank God for different opinions. Imagine the world if we all wanted the same woman

  2. #2

    Member Sales Rating: (20)

    Join Date
    Jan 2004
    Location
    7th Circle of Hell - aka DFW
    Posts
    10,673

    Default

    So you have two sets of speakers, one 4 and one 8 ohm, and you want to put them on the A and B channels of your receiver?

    Well I definitely wouldn't run them at the same time given that scenario, but I don't see any reason why you couldn't do what you're saying and just listen to one set of speakers at a time. I suppose if you had A and B both accidentally selected you wouldn't blow anything up - but I wouldn't try listening like that for any real amount of time.

    P.S. - I don't know why you can't run both simultaneously, just doesn't sound right to me and it's not something I'd want to do.
    Main HT
    Magnepan 1.6QR fronts, POlk R15 surrounds, Pioneer SC-25, Parasound Halo A23, Oppo BDP-105, Panasonic TC-P60ZT60, Sony PS3, Apple TV

    Bedroom System
    Polk Blackstone TL3, Polk PSWi225 Wireless Sub, HK 3490 Integrated, Oppo BDP-103, Sharp Aquos 32" TV, Apple TV

    Office Rig
    27" iMac w/Amarra, AudioQuest Dragonfly 1.2, Focal XS Book, Schiit Valhalla, Cypher Labs Theorem 720, Philips Fidelio X1, Sennheiser HD600, HiFiMan HE-500, B&W P7, LG 47LM7600, Sony PS3, Apple TV

  3. #3

    Member Sales Rating: (28)

    Join Date
    Mar 2005
    Location
    Right here.
    Posts
    10,414

    Default

    Thanks; one of the speakers set would be in the deck; the other one inside. I plan to use the adcom, though might experiment with the HK..have heard good things about that receiver.
    _________________________________________________
    ***\\\\\........................... My Audio Journey ............................./////***

    2008 & 2010 Football Pool WINNER
    SOPA

    Thank God for different opinions. Imagine the world if we all wanted the same woman

  4. #4

    Member Sales Rating: (16)

    Join Date
    Mar 2005
    Location
    In A Van Down By The River
    Posts
    21,240

    Default

    Quote Originally Posted by HTrookie
    Thanks; one of the speakers set would be in the deck; the other one inside. I plan to use the adcom, though might experiment with the HK..have heard good things about that receiver.
    The Adcom would have no trouble running both at once at moderate levels. I not 100% sure but almost all units with speaker switching capabilities have the swtich wired in series so it doesn't halve the impedence like running them in parallel would. So I wouldn't worry.

    Not sure about the impedence switch...never owned any equipment with that function. Adcom's have no trouble running 4 or even 2 ohm loads. I'm sure the HK would work well also.

    Fwiw

    H9
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass

    Pass Aleph 30; Eastern Electric Mini Max; Adcom GDA600; MIT S3/Z Pc; SDA 1C; Squeezebox; Tubes add soul!

  5. #5

    Member Sales Rating: (0)

    Join Date
    Nov 2004
    Location
    Sioux Falls, SD
    Posts
    120

    Default

    While H9 is right:
    almost all units with speaker switching capabilities have the swtich wired in series
    I have a Denon that runs them in parallel. While it is great for running the mains bi-wired (sorry about opening that can of worms) it would probably cause problems running a 4 ohm load with anything else. IMHO it sounds like it may be time for a check or the receiver's manual just to make sure it doesn't get more than toasty warm.

    Labrat

  6. #6

    Member Sales Rating: (2)

    Join Date
    Jun 2003
    Location
    Long Island, NY
    Posts
    2,098

    Default

    Quote Originally Posted by heiney9
    Not sure about the impedance switch...never owned any equipment with that function. Adcom's have no trouble running 4 or even 2 ohm loads. I'm sure the HK would work well also.
    I was told to never use the impedance switch on a receiver. It's a requirement from UL that enables manufacturers to say a lower line (lower cost) amp can handle 4ohm speaks. Basically it cuts down the amp so it doesn't overheat...

    Most HKs can handle 4ohm speaks but they can't advertise it because of the above mentioned electric standards set by UL for home use. (this is what an HK rep told me).
    Last edited by Mike682; 09-24-2005 at 06:50 PM.
    Receiver: harmankardon AVR235
    Mains: polk R30
    Center: polk CSi3
    Rear Surrounds: polk R20
    Subwoofer: polk PSW404
    DVD: Panasonic DVD-S29

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

     

Posting Permissions

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