Is my receiver too powerful for Kef Q300? - AVS Forum
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post #1 of 5 Old 03-01-2013, 05:01 PM - Thread Starter
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I purchased a Yamaha RX-V1900 (130watts per channel x 7) a few years back. It's been more than enough for my Klipsch 100 watt per channel Synergy 5.1 speakers. Could have been thrilled for my room with something at 90-105 watts per channel but I was told 130x7 would do fine through 100 watt RMS speakers, especially if they're not usually played at super loud volume for a sustained period of time.

I'm interested in upgrading to Kef Q300 mains. Will these be overpowered by my receiver? If I want to go with these Kefs (100 watt RMS), do I need to downgrade my receiver to something closer to 100 wpc?

I'd like to stay with the receiver I have. I think I could use my presence channels to bi-amp the Q300s. But if the Q300s already have a 100 watt RMS, wouldn't bi-amping send 260 watts to the speakers? Wouldn't that be way too much?

Basically if someone could briefly explain why so many smaller speakers like the Klipsch reference and Kef Q lines have power handling that is less than most of the mid-powered receivers?
And also explain bi-amping and why such speakers would or wouldn't tolerate that the double load.

Thanks!

-any advice on KEF Q300 vs. Klipsch RB-61 would be appreciated too, 50/50 music/HT. I'd like to know about the finish and build quality on the KEFs as well, never seen them in person. Gotta find a way to audition them haha

Yamaha RX-V675
Klipsch SF-1 x2
Klipsch SC-1
Klipsch Quintet II satellite x2 side surrounds
Panasonic TC-P50ST60
Panasonic BDP-230
XBOX 360
Apple TV 2
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post #2 of 5 Old 03-01-2013, 05:11 PM
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Just because a tire is rated for 130 MPH, that doesn't mean you have to drive 130 MPH all day; it just means you CAN...but will you?? Your engine may be rated for 250 horsepower, but most of the time you will never use more than 50 or 100 at the most.

And just because a speaker is rated for a MAXIMUM of 100 watts, that doesn't mean you are very likely to ever apply that much power to it.

100 watts per channel is enough power to run 95% of the speakers on the market, and most of the time you will NOT have the volume turned all the way up and will only be using a few watts of power 99% of the time to drive your speakers at listening volume.

In theory, if you actually think the receiver can put out 130 watts per channel (it can't and wont), then you could maybe turn the volume up to where the windows and speakers are damaged, but no sane person ever will.

KEF has been one of the top speaker manufacturers in the world for 50 years, and they make excellent speakers.

I had a pair of their iQ9 speakers for years and they were both excellent-sounding and beautifully made and finished (wonderful black walnut veneer).

The chances of anyone being disappointed with KEF speakers are small.
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post #3 of 5 Old 03-01-2013, 05:23 PM - Thread Starter
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Thanks, sure I get that the receiver doesn't actually do 130 watts per channel, and that I'd never sanely use that much anyway. Just wondering how close the power ratings should match for best performance.

What about bi-amping? Still will be in safe range of input at any reasonable volume?

Yamaha RX-V675
Klipsch SF-1 x2
Klipsch SC-1
Klipsch Quintet II satellite x2 side surrounds
Panasonic TC-P50ST60
Panasonic BDP-230
XBOX 360
Apple TV 2
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post #4 of 5 Old 03-01-2013, 05:28 PM
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Quote:
Basically if someone could briefly explain why so many smaller speakers like the Klipsch reference and Kef Q lines have power handling that is less than most of the mid-powered receivers?

The Yammy 1900 would be fine with your KEF speakers. In a multichannel setup it most likely does not put out 130W x 7 anyway. Manufactures generally embellish power ratings in receivers. I haven't seen any bench test results to confirm the power rating of the RX-V1900. And if you were running your receiver at that volume level you wouldn't be able to stay in the room anyway because of the loudness.
Quote:
I'd like to stay with the receiver I have. I think I could use my presence channels to bi-amp the Q300s. But if the Q300s already have a 100 watt RMS, wouldn't bi-amping send 230 watts to the speakers? Woulldn't that be way too much?

Speakers don't put out watts, amps do. So the Q300's don't already have 100 watts. That rating is how much power they can handle. According to the KEF website the Q300 is recommended for receivers/amps from 15W to 120W. http://www.kef.com/html/us/showroom/hi-fi_series/q_series/fact_sheets/Bookshelf/Q300/index.html

You're worrying about nothing. You'll never push 130W thru these speakers. Besides if your Klipsch Synergy have a 100W power handling and the Q300's have a similar rating why do you think there would be a problem?

p.s. bi-amping is a waste of time, don't bother and it doesn't double the power either.

Afro GT
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post #5 of 5 Old 03-01-2013, 05:49 PM
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All of the above is 100% correct; no problem at all.
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