Receiver/Speaker - Assistance in Matching - AVS Forum
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post #1 of 3 Old 10-21-2013, 04:25 AM - Thread Starter
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Hi,
I upgraded to 5.1 and 7.2 polks (RTI4's and CSI A6's) in living room and basement last xmas. I just lost my onkyo receiver in the basement (forgot model). I got a crazy price match deal for the onkyo tx n727 for $400!!
After looking at the specs of the speakers and the receivers, i think i might have been underpowering my speakers with the onkyo tx-nr515.


Could someone please look and see at the specs below, to determine if i am underpowering them? I noticed a much much better speaker sound out of the 727.. and figure if i can get a good deal i mine as well upgrade. I had been thinking about it anyways for the 4k upscale but from what im seeing, the 515 DOES upgrade already. All specs for speakers and receivers are below..

I dont wanna get caught up in the "higher numbers are worth the upgrade" because i know some of them might not be able to be distinguished or etc..
Thnx for all the help!


What i have:
Onkyo TX-NR515 (living room)
Amplifier Section
Power Output
All Channels 100 W (6 ohms, 1 kHz,
0.7%, 2 channels driven)
Front L/R 80 W (8 ohms, 20 Hz-20 kHz, 0.7%, 2 channels driven, FTC)
125 W + 125 W (6 ohms, 1 kHz, 0.1%, 2 channels driven, FTC)
Center 80 W (8 ohms, 20 Hz-20 kHz, 0.7%, 2 channels driven, FTC)
125 W (6 ohms, 1 kHz, 0.1%, 2 channels driven, FTC)
Surround L/R 80 W (8 ohms, 20 Hz-20 kHz, 0.7%, 2 channels driven, FTC)
125 W + 125 W (6 ohms, 1 kHz, 0.1%, 2 channels driven, FTC)
Surround Back L/R 80 W (8 ohms, 20 Hz-20 kHz, 0.7%, 2 channels driven, FTC)
125 W + 125 W (6 ohms, 1 kHz, 0.1%, 2 channels driven, FTC)
Dynamic Power 180 W (3 ohms, 1 ch)
160 W (4 ohms, 1 ch)
100 W (8 ohms, 1 ch)
THD+N (Total Harmonic Distortion + Noise) 0.08% (20 Hz-20 kHz, Half power)
Damping Factor 60 (Front, 1 kHz, 8 ohms)
Input Sensitivity and Impedance 200 mV/47 k-ohms (Line)
Output Level and Impedance 200 mV/2.2 k-ohms (Rec out)
Phono Overload -
Frequency Response 5 Hz-100 kHz/+1 dB, -3 dB (DSP bypass)
Tone Control ±10 dB, 50 Hz (Bass)
±10 dB, 20 kHz (Treble)
Signal-to-Noise Ratio 100 dB (Line, IHF-A)
Speaker Impedance 6 ohms16 ohms

Onkyo TX-NR727 (man cave)
All Channels 125 W (6 ohms, 1 kHz, 0.7%, 2 channels driven)
Front L/R 125 W (6 ohms, 1 kHz, 0.7%, 2 channels driven)
Center 125 W (6 ohms, 1 kHz, 0.7%, 2 channels driven)
Surround L/R 125 W (6 ohms, 1 kHz, 0.7%, 2 channels driven)
Surround Back L/R 125 W (6 ohms, 1 kHz, 0.7%, 2 channels driven)
Dynamic Power 250 W (3 ohms, Front)
220 W (4 ohms, 1 Front)
130 W (8 ohms, Front)
THD+N (Total Harmonic Distortion + Noise) 0.08% (20 Hz-20 kHz, Half power)
Damping Factor 60 (Front, 1 kHz, 8 ohms)
Input Sensitivity and Impedance 200 mV/47 k-ohms (Line)
2.5 mV/47 k-ohms (Line)
Rated RCA Output Level and Impedance 200 mV/2.2 k-ohms (Rec out)
Maximum RCA Output Level and Impedance 2.0 V/2.2 k-ohms (Line Out)
Phono Overload 70 mV (MM, 1 kHz, 0.5%)
Frequency Response 5 Hz-100 kHz/+1 dB, -3 dB (DSP bypass)
Tone Control ±10 dB, 50 Hz (Bass)
±10 dB, 20 kHz (Treble)
Signal-to-Noise Ratio 106 dB (Line, IHF-A)
80 dB (Phono MM, IHF-A)
Speaker Impedance 6 ohms16 ohms

Polk RTI4
Total Frequency Response 50Hz-27kHz
Upper -3dB Limit 26 kHz
Lower -3dB Limit 60 Hz
Nominal Impedance 8 ohms
Efficiency 89 dB
Recommended Amplifier Power 20-125 watts per channel
Inputs Dual (bi-amp) gold plated 5-way binding posts

Polk CSI A6
Total Frequency Response 45Hz-27kHz
Upper -3dB Limit 26 kHz
Lower -3dB Limit 55 Hz
Nominal Impedance 8 ohms
Efficiency 90 dB
Recommended Amplifier Power 20-200 watts per channel
Inputs Dual 5-way binding posts
Onkyo TX-NR727
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post #2 of 3 Old 10-21-2013, 05:47 AM
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Quote:
Originally Posted by Wetdream View Post

Hi,
I upgraded to 5.1 and 7.2 polks (RTI4's and CSI A6's) in living room and basement last xmas. I just lost my onkyo receiver in the basement (forgot model). I got a crazy price match deal for the onkyo tx n727 for $400!!
After looking at the specs of the speakers and the receivers, i think i might have been underpowering my speakers with the onkyo tx-nr515.


Could someone please look and see at the specs below, to determine if i am underpowering them? I noticed a much much better speaker sound out of the 727.. and figure if i can get a good deal i mine as well upgrade. I had been thinking about it anyways for the 4k upscale but from what im seeing, the 515 DOES upgrade already. All specs for speakers and receivers are below..

I dont wanna get caught up in the "higher numbers are worth the upgrade" because i know some of them might not be able to be distinguished or etc..

The first cut answer to your question without even looking at the detailed evidence is that you probably are not underpowering your speakers. A lot of audiophiles have been confused by the audiophile myth that your speakers will be damaged by too small of an amplifier. In fact speakers are damaged by excessive power and a sure way to avoid excessive power is to use a very small amplifier. A sure fire way to increase the possibility of applying excessive power to a speaker and thereby damaging it is to have a very, very powerful amplifier.

The second cut answer is that we can estimate how loud (dB SPL) your system can get from amplifier power, speaker efficiency, number of speakers, and distance from listener to speakers. Here is an online calculator for doing that for yourself:

http://myhometheater.homestead.com/splcalculator.html

The third cut answer is that we don't know how loud you want to play your system and from answer 2 that is all important, and you probably don't know this right now either. The tool of choice for estimating this is a SPL meter which can be found all over the web for reasonably cheap prices.
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post #3 of 3 Old 10-21-2013, 05:51 AM - Thread Starter
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o wow. thank you very much for the insight. usually i dont play it all too loud.. we are in a townhouse. but in time in a single family home i will crank em up. also, i mean i did notice that there was a clear cut clarity improvement with the 727 receiver. was it better power rating from rcvr? was it the thx or other settings i tweaked? i dont know...

im a high level novice in my knowledge lol.. i know more than any other friends or family and can hold a conversation but am dwarfed by others, especially on avs haha. i appreciate the straight forward info as opposed to blasting me for being ignorant of such info. its much appreciated!

i will check this stuff out later tonight for sure.
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Polk Audio Rti4 High Performance Bookshelf On Wall Speakers , Polk Audio Csi A6 Center Channel Speaker , Onkyo Tx Nr727 7 2 Channel Network Audio Video Receiver , Onkyo Tx Nr515
Gear in this thread - Nr515 by PriceGrabber.com

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