Originally Posted by sandydankness
Title says it all, and i'm looking for amp suggestions. I've got an Onkyo TX-NR828 avr. It states it has 130 w/c at 8ohms 2 channels, so I figure i'm only getting 37w/c with all 7 speakers right now, right?
The 37 watt number is based on tests with pure sine waves, all channels driven with the identical same signal, and resistive loads. That's completely different duty than playing multichannel music. Music has far less average power than pure sine waves with equal peak levels. Resistive loads have average loading that is greater than speakers with the same nominal impedance. In real music and drama, all channels are not driven with the same signal (we hope!). 105 dB SPL peaks are too loud for most people's preferences.
. Either way, it's not loud enough. I bought it because it's got 9 or 11 preouts even though I run a 7.2 surround. I'm thinking about a 5 channel amp somewhere around 150-200 w/c. If I do that, I will have 2 channels left of the avr to push 130 w/c, right?
The biig problem is that the AVR may be still able to kick out 100+ wpc in actual use, and 200 wpc is only 3 dB more power. It takes 10 dB more power to give the subjective impression of "twice as loud".
Here's a very practical experiment - listen to your system at a typical level (not crank 'er up but typical comfortable listening level) and then click the volume on your remote up or down six clicks. It isn't that much change, right. That's what your proposed amp upgrade will do for you, if you are indeed already running your system into clipping.
So, as long as I'm thinking right does anyone have a 5 channel amp suggestion? Or maybe i'm wrong and need clarification, which would be usefull too. Thanks,
From thousands of miles away I can't tell you whether you need more power or not. However, if you can express your situation in numbers, then we have something reliable to talk about.
(1) What are the loudest levels you are listening at now? To get a reliable number for that, obtain an inexpensive SPL meter that reads and holds peak levels with fast response. Here is such a thing for a price that anybody who is talking about major amp upgrades should be able to afford, and it is easy enough to use:
Use a peak SPL calculator to estimate how much power you are currently using on peaks:
As the old saying goes " (Reliable) knowledge is power".
The above are not infallible, but they are probably better than nothing. ;-)
You might want to add at least 10 dB more power (10x watts) than you are currently using if you want a system that actually sounds much louder. Of course that kind of power may be hard on your existing speakers...
If your subwoofers are the typical active (self-powered with built in amplifiers) subwoofers, they significantly offload your AVR in your quest for loudness. They might allow your system to get 3-5 dB louder that it would without them. Make sure that your main speakers are set for small. BTW what are your speakers?Edited by arnyk - 1/28/14 at 2:10am