Polk LSi15's
Ducati Guy
Posts: 160
I have an A/V receiver (Onkyo TX-NR709) bi-amping my LSI-15's(front speakers).
The receiver is rated at:
110watts per channel at 8ohms when 2 channels are driven
130watts per channel at 6ohms when 2 channels are driven
"Certified" at 4 ohms.
I set the receiver's impedance at 4ohms.
When I emailed Onkyo, what is the measured ratings at 4ohms they stated
"about 150watts per channel at 4 ohms at 0.1% distortion".
Since the speakers are being driven by 2 amps in the receiver, are they each receiving 150+150=300watts to the left speaker and 300watts to the right speaker?
Please clarify if my math&understanding of this is correct.
If you Bi-amp your speakers do you essentially double the power/watts?
I read in a hifi magazine recently of a test measurement they did of the 5 channel Onkyo A/V receiver @ claimed 80watts per channel.
They measured 82 watts per channel with 2 channels driven.
They measured only 28 watts per channel when all 5 channels were driven.
With my 7.2 system Onkyo TX-NR709 biamping the front speakers only, for 2 channel audio listening only, no surround speakers, is my math correct in terms of the how many watts the speakers are receiving?
Thanks all in advance.
The receiver is rated at:
110watts per channel at 8ohms when 2 channels are driven
130watts per channel at 6ohms when 2 channels are driven
"Certified" at 4 ohms.
I set the receiver's impedance at 4ohms.
When I emailed Onkyo, what is the measured ratings at 4ohms they stated
"about 150watts per channel at 4 ohms at 0.1% distortion".
Since the speakers are being driven by 2 amps in the receiver, are they each receiving 150+150=300watts to the left speaker and 300watts to the right speaker?
Please clarify if my math&understanding of this is correct.
If you Bi-amp your speakers do you essentially double the power/watts?
I read in a hifi magazine recently of a test measurement they did of the 5 channel Onkyo A/V receiver @ claimed 80watts per channel.
They measured 82 watts per channel with 2 channels driven.
They measured only 28 watts per channel when all 5 channels were driven.
With my 7.2 system Onkyo TX-NR709 biamping the front speakers only, for 2 channel audio listening only, no surround speakers, is my math correct in terms of the how many watts the speakers are receiving?
Thanks all in advance.
Post edited by Ducati Guy on
Comments
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Hey D Guy, Welcome to Club Polk!
The Numbers that Onkyo gives is not very honest. I do own a TXSR 608, and mine gives 100 WPC with 2 channels driven. However when tested by an audio magazine after a review, the bench test showed my model at 82 WPC with 5 channels driven by a 8 ohm load. It also said that it droped to about 30 WPC with 7 channels driven. The review might have been by Home Theater magazine, something like that, I found it online.
Maybe you can see if they did test on your model too and find out the real numbers that you need to make the correct choices. -
One more thing, If you trying to Bi-amp from the same receiver, it's not bi-amping, that would be bi-wiring. You need 2 amps to bi-amp thus the name. It might be best to run your LSI's with a single set of wires and use the jumper plates and let the receiver power them better.
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Do yourself a favor, pick up a dedicated 2 (or 3) channel amp that can run 4 ohm loads and you will be much happier. Even if the Onkyo can handle the 4 ohm load, the wattage your getting is going to be low enough your not really getting to enjoy the headroom you get with a dedicated amp.
I suggest a 3 channel amp since more than likely you will want the LSiC center which also needs some decent current to sound good.
Vintage Hi-Fi of Pittsburgh is selling a Carver AV-705x amp for like 400ish bucks. Its 5 channels (which is more than you need but whatever) and its the same amp I am using on my 15's and LSiC.
I do plan to upgrade to a better amp when I have the funds, but its been running my LSi setup for 5+ months with no issues at any volume level I have played music/movies at.
Link to amp here: http://www.vintagehifipgh.com/index.php?main_page=index&cPath=40_42"....not everything that can be counted counts, and not everything that counts can be counted." William Bruce Cameron, Informal Sociology: A Casual Introduction to Sociological Thinking (1963) -
Hey thanks for the welcome.
So how many amps are in a 7.2 system receiver?
Only 1 amp? Not 2 amps?
If there's only 1 amp then the only thing I'm really doing is bi-wiring my speakers vs "Bi-amping" them. -
Ducati Guy wrote: »Hey thanks for the welcome.
So how many amps are in a 7.2 system receiver?
Only 1 amp? Not 2 amps?
If there's only 1 amp then the only thing I'm really doing is bi-wiring my speakers vs "Bi-amping" them.
There are 7 channels, but its being driven by ONE transformer (amp). Bi-amping requires a bunch of stuff (I only know of 1 forum member fully bi-amping properly) such as 2 amplifiers, a crossover between the receiver and amps, and then pulling the crossovers from the speakers.
What the Onkyo is doing when its "bi-amping" is using 2 channels from the SAME tranformer to drive the speaker. Your not really getting any more power, just using it from 2 places per speaker.
I have an Integra which has the same option. I do not use it."....not everything that can be counted counts, and not everything that counts can be counted." William Bruce Cameron, Informal Sociology: A Casual Introduction to Sociological Thinking (1963) -
Got another question for you guys,
The Onkyo states that you can connect an external amplifier to drive the front speakers. I was originally contemplating buying a Creek Destiny 2 Integrated amp but wanted a receiver that could accept HDMI's (for the Sony Playstation3, HD cable). I read on the Creek/Music hall website that their amp can be hooked up to an A/V receiver.
Is this easy to do and will it affect the sound quality of the Creek Amp?
