 
|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
|
|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
...when considering proper amplifier matching? The issue at hand is this: I have a basic $250 Dolby 5.1/DTS receiver that states one can only use 8 ohm speakers. My JBL rear and center channel speakers are indeed 8 Ohms, but my older Polk 'Monitor 10B's from 1986 are rated at 6 Ohms, as is stated in the 'instruction manual' that came with them. It is also stated that "If your amplifier outputs have multiple impedance taps, connect your speakers to the output terminals labeled "4 Ohms". Will I ruin the amp (or Polks) if I connect them?Thanks in advance!
Follow Ups:
I owned the 10Bs for a number of years and several times I blew the tweeter fuse and on a couple of occasions I blew the tweeters. I was using pushing a a nice 40 Watt NAD amplifier beyond its limits when this happened and the speakers are rated at 100 watts or so. I can only assuming the amplifier clipped and this is what was causing the tweeters to blow. If I recall the nominal rating of the 10B was 6 ohms but dipped to below 4 ohms at some frequencies - depending on the quality of amplification and how hard you drive them there could be some issues driving the Polks alone - and even a greater chance of having problems if you connect another speaker in parallel with them.
Give me rhythm or give me death!
i read somewhere that the ohm rating on speakers is a nominal rating.an 8ohm speaker might run from 4-16 ohms.it seems that lower resistance is encountered with deep bass,especially at high volume.so if you don't push it too hard,you'll probably be okay.
mark
According to Roger Russell, (engineer for McIntosh Speakers for many years) it's ok. I recently purchased some old, hardly used Polk signature reference 2.3 speakers, that were also rated at 6 ohms. I am using a McIntosh mc7300 two channel amp for these speakers. Anyway, I had the same question. I had just done some business with Roger Russell, who created McIntosh's loudspeaker line many years ago, and he informed me that it would be perfectly ok to wire the speakers to the 8 ohm terminals. He also said biwiring is a waste of time, that there is no measurable difference. I have had this setup running almost 6 months with no problems and great sound!
http://www.sundial.net/~rogerr/aboutmc.htm
From my hard experience if you turn up the volume much the
amp section will cook. Do you have a multi-meter? Set it ohms,
disconnect the wires from one of the speakers, and put a probe
on each speaker terminal and read the ohms. if its 5 or less
(Note DC resistance is always lower than the rating) you can't use them. Sorry. :-(
I did that using a pair of JBL speakers hooked up to a Sony DA555ES receiver for about a year, and it worked fine. However, I must say that the receiver got noticeably hotter when set at 8 ohms rather than 4. But since I never could blast the volume anyway in the apartment complex, I doubt it impacted the receiver so much.
This post is made possible by the generous support of people like you and our sponsors:
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2025, Audio Asylum, all rights reserved ]
