AVS Special Member
Join Date: Dec 2007
Location: Southern California
Mentioned: 3 Post(s)
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There is nothing "unsafe" about using what you propose.
The thing to be aware of is that you receiver is rated for is rated for 80 watts per channel with the front 2 channels driven.
That means that the only power guaranteed to be there is 160 watts, total.
In fact, your receiver has a power supply which has a total power output capability of about 350 watts. Allowing 50 watts to run all of the other circuits, that leaves about 300 watts to run the amplifiers. Any spec that implies that more than 350 watts total power is available from that receiver is a dirty LIE!
This means that you can expect about 50-60 watts per channel maximum to be available when you are driving 5 channels.
This is plenty of power to play pretty loud with speakers that efficient, and of course the low bass is amplified by the subwoofer's own amplifier.
If you are a "Cranker", and want to play it really loud, that might not be enough. If you start to hear noticeable distortion, turn it down.
If that is the case, the way to make your receiver play louder is to add a power amplifier to drive the rear 2 channels. This should have a 80 watt per channel rating or higher. By using this to drive the rear 2 channels, the 300 watts you have available from the receiver will only have to drive the remaining 3 channels, which will be able to get more power than before (80 watts per channel to 3 channels). You will now have a substantial increase in total power available.
The rear 2 channels are the only ones that have separate preamp output jacks on the 509, so that is where the external amp will have to be used (see page 11 of the owners manual; nothing will be connected to the surround speaker terminals in this case).
There are tons of power amplifiers out there, new and used, including the Emotiva UPA-2 and XPA-2.
The 609 would not be a significant increase in power in any case. To get a significant increase in receiver power, you would need a receiver on the order of the 3009.
Adding a power amplifier is better and more cost-effective, if more power is the issue.
Have fun with it! Happy new year.
[quote=KtrainHurricane;21433511]I pulled the trigger on an Onkyo TX-NR509 receiver because of the great Cyber Monday deal Newegg had. I was really happy with it and read great things, but I also purchased it before any of my other equipment. I am now in a situation where I might be getting a pair of Polk RTi8 towers to go along with my CSi5 center channel, RTi6 rears, and Klipsch KSW 100 subwoofer.
Can I "safely" run this setup with my receiver? I have fear of over-working the AVR, and even though it still isn't that much of an improvement, I am beginning to wish I had purchased the TX-NR609 instead.