0ur opinion: :ln the case of 0nkyo A/V receivers, ?entry level? means a whole lot more than just affordability and standard functionality. You won't find a better example than the TX-SR506, which also offers high-definition media capability and advanced sound correction technologies. With an HDMl platform handling 1080p video from three sources, the TX-SR506 brings polish and peak performance to high-definition displays and sources. Legendary 0nkyo amplification drive and power set the foundation for delivering bass crunch and vocal clarity. The TX-SR506 uses Audyssey 2EQ to counter distortion created by walls, furniture and other objects. This technology detects speaker distance, and then sets levels, delays, and crossovers, while also measuring room acoustics and you get to enjoy a sweeping soundstage even at low volumes. Easily holding its own among higher-priced A/V receivers, the TX-SR506 adds serious impetus to entry-level home theater. THD (Total Harmonic Distortion) - 0.08% (Rated power) Damping Factor - 60 (Front, 1 kHz, 8 ohms) lnput Sensitivity and lmpedance - 200 mV/47 k-ohms (Line) 0utput Level and lmpedance - 200 mV/2.2 k-ohms (Rec out) Frequency Response - 5 Hz-100 kHz/+1 dB, -3 dB Tone Control - +-10 dB, 50 Hz (Bass), +-10 dB, 20 kHz (Treble) Signal-to-Noise Ratio - 100 dB (Line, lHF-A) Speaker lmpedance - 6 ohms-16 ohms Video - 1 Vp-p/75 ohms (Component and S-Video Y), 0.7 Vp-p/75 ohms (Component PB/CB, PR/CR), 0.28 Vp-p/75 ohms (S-Video C), 1 Vp-p/75 ohms (Composite) Approximate Unit Dimensions - 17.12? (W) x 5.87? (H) x 14.83? (D) Approximate Unit Weight - 21.56 pounds
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Testimonials
Average Buyer Rating:

Buyer's feedback: 
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* Very good for the price ...
I helped a friend who wanted an inexpensive yet decent receiver. He hooked it up to a pair of Paradigm Titans. The Onkyo sounded very nice - smooth and not fatiguing, both with music and movies. I own a more upscale audio system, and this receiver is a no match for it - as I expected. Then we compared it to an older Marantz stereo reciever (selling for $350 15 years ago) that I still use in my den. The Marantz was clearly better - more detailed, more dynamical, but still smooth. We tried both the digital and the analog inputs.
The bottom line is - a very nice receiver from a decent company. If you really care about sound quality however, and will use it for music, as well - get a Marantz or a Denon (within this price range). It will cost a bit more but it is worth it.
Buyer's feedback: 
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Solid home theater receiver! Would recommend
This receiver has a ton going for it, and little holding it back! With 1080p passthrough, 3 HDMI inputs, 1 HDMI output, 7.1 channel surround sound, and all the dolby and dts decoding, this is a sweet home theater receiver at an amazing price. I have mine hooked up with a blue ray player, a 50" 1080p plasma, and a bose surround sound system, and it couldn't get much better. The ONLY beef that I have with this receiver, is the hdmi inputs only pass through video, no audio! This means that you can hook up 3 pieces of equipment via HDMI and output it all to your tv, but you will have to hookup the audio sources separately. At first, this might seem ridiculous, but here is the scoop. It is equipped with 3 optical inputs, and optical is capable of reproducing any sound quality with the exception of Dolby HD Master. I have heard an HD master track, and the difference is too minute for me to discern. Overall, this receiver is Money in the Bank... literally, at this price
Buyer's feedback: 
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* Great Entry Level Unit ...
I bought this for the bedroom. My wife wanted something to play music, and I figured I might as well install a 5.1 system. You can't be Onkyo when it comes to "bang for your buck". If you don't attend to add a bluray, this is the unit to buy.
Buyer's feedback: 
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Onkyo Receiver 506
A good choice for my home entertainment center. Zone B or 2 takes a bit of time to get sound and is only analog. The zone A fiber optics digital sound is superb. It's a lot of receiver for the buck. The price is right.
Buyer's feedback: 
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* Good basic receiver ...
This is a good basic A/V receiver. I got this for my computer to drive the 7.1 speakers I already had. I'm strictly using it for amplification so I'm not concerned with the lack of audio through HDMI. Audessy is a nice plus for easy setup. I would definitely recommend this receiver as long as it is not a center piece for a home theater setup with HDMI.