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Onkyo 876 & 4 ohm speakers - need amp?

post #1 of 21
Thread Starter 
Read conflicting views, so need concensus. The room is 19x26x9 and will play moderate to loud. Have 7.1 setup:

Fronts: Polk LCi-RTS105s
Center: Polk LCi-RTS-C
Sides: Polk LCi-RTS FX
Rear: Polk LCi-RTS100s

Is the 876 enough to drive these, or need power amp? If so, 3, 5, or 7 channel? Will take advice and order from Emotiva before sale ends, if needed.

Thanks
post #2 of 21
You could get ten different answers from ten different people because it really comes down to are you satisfied with the sound. Since your asking I would assume not so IMO yes you do need to buy a amplifier. Although the 876 is a fine A/V receiver it isnt rated at 4ohm, 6 is the lowest, not only that but onkyo power ratings always rate the power per channel with only 2 channels driven. Meaning your attempting to power 7 speakers and its rated at only 2. So the numbers arent nearly as high as what you may read, it would be more like 75/channel which is not enough to really use the full capability of the speakers.

I have a similar setup with a 7.1 polk lsi series setup and I recently purchased a emotive 3 channel beast because the same question. Now I'm only powering the front and my onkyo 705 powers the rears but I have to say its quite impressive. Not from a volume standpoint, although it can get a little louder then before but from a clarity one. The highs are a little higher and clearer up there and the low and mids are where they should have been. All your doing is starving your speakers of power which if they clip you could have a serious problems.

I would suggest a 3 channel amp to start with for the front and see if you really notice a difference. But at this point with how much money and time you have invested in your HT its prolly worth the purchase. I would only buy the xpa series tho, better components than the UPA series IMO.
post #3 of 21
Thread Starter 
I was going to add amp later anyway, but I was concerned with damaging something before then. I'll order up a 3 channel to start. Thanks for help.
post #4 of 21
Yes, the 876 will drive those (your Polks), don't fret it.

Bob
post #5 of 21
Quote:
Originally Posted by bigdep View Post

Although the 876 is a fine A/V receiver it isnt rated at 4ohm, 6 is the lowest, .

Can you clarify this statement, given this chart which I thought shows the 876 is certified for 4 ohm performance?

http://www.onkyousa.com/model.cfm?m=...s=Receiver&p=f
post #6 of 21
Quote:
Originally Posted by WannaBinHD View Post

Can you clarify this statement, given this chart which I thought shows the 876 is certified for 4 ohm performance?

http://www.onkyousa.com/model.cfm?m=...s=Receiver&p=f

Don't sweat it, the 876 is a very capable receiver that will drive 4ohm loads.
It is THX Ultra2 Plus certified. (Which means it has been tested to sustain loads as low as 3.2 ohms.)

Bob
post #7 of 21
Quote:
Originally Posted by WannaBinHD View Post

Can you clarify this statement, given this chart which I thought shows the 876 is certified for 4 ohm performance?

http://www.onkyousa.com/model.cfm?m=...s=Receiver&p=f

Look at the testing they never go lower than 6 ohms. Also power numbers are rated when only 2 channels are driven. Try added 5 more and lower the ohms. That is hardly enough to handle power hungry speakers. Why take a chance of clipping.
post #8 of 21
The 876 has all the power that is required to drive some pretty tough speakers.
I know, that's what I'm using to drive my all around 4ohms speakers.
My center goes even to 2.8 ohms.

My 876 drives my 7.2-channel speakers with no problem.

Bob

Note: Check the reviews of the 805 and 875 around, you'll see what I mean.
Just Google it and read.
post #9 of 21
The 876 receiver is about as capable as it gets in any avr to drive power hungry speaker and yes to all above it is rated at 4ohms, check the manual and should not have any issues unless it's being driven to very loud levels in a large room.

Whether you need an amp is up to you, your listening levels, speakers and the size room you have to fill. I personally would be happy with the 876 powering those speakers and not feel the need to add anything, but again that's up to you. If your asking the question now you mise well go ahead and do it as you'll always wonder so why not answer the question for yourself and put your mind at ease.
post #10 of 21
Quote:
Originally Posted by bigdep View Post

Although the 876 is a fine A/V receiver it isnt rated at 4ohm, 6 is the lowest, not only that but onkyo power ratings always rate the power per channel with only 2 channels driven. Meaning your attempting to power 7 speakers and its rated at only 2. So the numbers arent nearly as high as what you may read, it would be more like 75/channel which is not enough to really use the full capability of the speakers.

You have no idea what you're talking about.

There's no 876 bench test up, but its amp section is at least as powerful as its predecessor, the 875 bench tested at 128W/7 channels.
post #11 of 21
Quote:
The 876 receiver is about as capable as it gets in any avr to drive power hungry speaker

In order to get UL & ULc rating, the 875 is current limited to 55 watts/ch with 4 ohm speakers (in 4 ohm mode). There are many AVRs that don't have this constraint.
post #12 of 21
Quote:
Originally Posted by s44 View Post

You have no idea what you're talking about.

There's no 876 bench test up, but its amp section is at least as powerful as its predecessor, the 875 bench tested at 128W/7 channels.

You have no idea what you're talking about learn how to read the review. haha 55 watts a channel at 4 ohm yeah thats plenty for a speaker rated at 250. Not to mention the bench test you provided is with a 8ohm load not 4. haha wow you need to stop drinking the onkyo koolaid. Go ahead and clip those speakers buddy.
post #13 of 21
Emotiva, Outlaw or even go higher $$$ and get a D-sonic amp, they are all viable amps for you.

Pick one and enjoy.
post #14 of 21
For the cost of the AVR + amp, a good shopper can find the NAD T175/955 combo on clearout. Better SQ, future upgradability + lower electric utility cost.
post #15 of 21
Quote:
Originally Posted by Southern Spy View Post

For the cost of the AVR + amp, a good shopper can find the NAD T175/955 combo on clearout. Better SQ, future upgradability + lower electric utility cost.

He owns the Onkyo 875 already so adding a pre/pro doesn't do squat.

Im not sold on the future upgradability stuff either and we all know Better SQ is just a subjective statement with no data to back it out.
post #16 of 21
The Onkyo is actually 4 ohm stable. Its a very stout multichannel amp. It will more than do the job. THose Polk speakers by the way do not put a true nominal 4 ohm load on that amp. More like 6-8 ohms over the useable frequency range.
post #17 of 21
Mate, did you end up getting an Emotiva with the Onkyo 876? If so, how much of an improvement is the Emotiva over just the Onkyo alone?
post #18 of 21
Quote:
Originally Posted by Lordoftherings View Post

The 876 has all the power that is required to drive some pretty tough speakers.
I know, that's what I'm using to drive my all around 4ohms speakers.
My center goes even to 2.8 ohms.

My 876 drives my 7.2-channel speakers with no problem.

Bob

Bob, in your setup do you have the 876 set at 4 ohms or 6 ohms?
post #19 of 21
Quote:
Originally Posted by jchong View Post

Bob, in your setup do you have the 876 set at 4 ohms or 6 ohms?

Leave in the 8 Ohm position, makes more power..

Just my $0.025...
post #20 of 21
I assume you mean 6 ohm since the 876 doesn't have an 8 ohm position.
post #21 of 21
I have just ordered the Onkyo sr876 to run with the Polk lsi15 floor standing speakers. I will be hooking a PS3 to the receiver as well. I am attempting to hook them up myself, but I am close to illiterate when it comes to electronics. Any advice is much appreciated.
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