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Using HT Reciever as a Stereo Amplifier - Pushing 6 ohm Speakers

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#1 of 5 OFFLINE   mrdontknow



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Posted June 17 2013 - 12:34 PM

So my old Fisher Stereo amplifier finally died, it was a great unit, but 30 years old.


I have an HTIB amplifier,  Onkyo HT-R510, that doesn't support HDMI.  So I bought an updated one for my HT.


I want to use the Onkyo as a Stereo amplifier for both indoor and outdoor.  Problem is my outdoor speakers are Yamaha's that are 6 ohm, the Onkyo outputs 8 ohms.


I hooked it up, not a lot sound, and when I cranked up the volume the amp must have overloaded and shut down.  I hooked up the original speakers, everything works.


I have tried the Yamaha's as both A & B speakers to no avail.  Do I have to ditch my Yamaha's or is there something I can do to use the amp with them.


I've done some research, but I'd really like a link to speaker impedance vs amp output.


Thanks for your help,



#2 of 5 OFFLINE   gene c

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Posted June 17 2013 - 01:18 PM

I guess the Onkyo is O.K. with the indoor speakers?


I'm very surprised the Onkyo shut down when connected to 6 ohm speakers. Onkyo's, even of that vintage, have always had fairly strong amp sections. I wonder if there's something else that caused it like bare strands of speaker wire touching the receivers cabinet. Maybe those Yamaha's are really much lower then 6 ohm. I'm currently running two sets of 4 ohm speakers with two different 8 ohm receivers and nothing has shut down (yet!). The Onkyo should be able to handle 6 ohm speakers, with plenty of output.

"Everyday room": Panasonic 58" Plasma, Dish HD DVR, Pioneer Elite vsx-23, BDP-23 BR, dv58avi universal dvd player, Paradigm Studio 20 V1, CC-450, Dayton HSU-10 subwoofer.

"Movie/Music room": Toshiba 65" DLP, Dish HD receiver, Marantz 7005, CC-4003, BD-7006, Polk LSI25's-LSi7's-LSiC, 2 original Dayton 10" "Mighty-Mites" subwoofers. (subject to change without notice).
Also have  MB Quart Vera VS05 +.....too much to list. Help me.


#3 of 5 OFFLINE   Phil A

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Posted June 17 2013 - 03:15 PM

Are you using both sets of speakers at once?  How long are speaker wire runs and what are you using?

#4 of 5 OFFLINE   schan1269


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Posted June 17 2013 - 03:40 PM

Something else is up beyond the outdoor speakers being 6ohm. How many are there? 2? 4?

#5 of 5 OFFLINE   mrdontknow



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Posted June 18 2013 - 10:12 AM

First, thanks for the responses.


To answer the questions:

 1) 2 Indoor Polk speakers R50's (8 ohms) 2 outdoor Yamaha's (6ohms)

Output could be heard from the Polk speakers, but not Yamaha's

When cranked up, Onkyo cut out. 

Waited 5 min's, tried again, same result.


2) 2 Indoor Polk Speakers worked fine running alone.


3) 2 outdoor Yamah 's connected to B speaker lines

  Same results as #1


4) 2 outdoor Yamaha's connected to A speaker lines (surrond front)

  Same results as #1


Inside Speaker wires are good ones, not great big ones, but are older, 14 guage

if I remember correctly, Length: 35 feet


Outside wires, run through the walls to the outside.

If I remember correctly 14/2. Length 50 feet


This all did work very fine with my old Fisher, don't remember the model number though.

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