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Sorry, it doesnt look like you can hook up an external EQ while still using the amplifier section of the yamaha. Instead, You would have to use the preamp out to go to 901 EQ, out of the EQ into another stereo amplifier, then to the 901 speakers. Personally, to power the 901's properly, I'd use another external amplifier. You will barley get 75watts per channel out of the receiver to power the 901's
Hi, Yamaha audio-video receivers are equipped with a variety of connecting jacks for hooking up different types of electronic equipment. Component AV cables are typically used for hooking up the receiver to a cable TV box. Component cables can also be used to connect the Yamaha receiver to an HDTV, although a High Definition Media Interface (HDMI) cable offers a simpler connection if the receiver is equipped with HDMI (all HDTV sets are equipped with the distinctive, six-sided HDMI jack). The connections should take less than five minutes.
Things You'll Need:
* 2 sets component AV cables * HDMI cable
Check the back of the Yamaha receiver to determine if HDMI is available. The six-sided jack contains 19 holes set in three rows. If the receiver is equipped with an HDMI Out port, use an HDMI cable to connect to the TV by inserting the plug straight into the jack with the wider end turned upward.
Insert the red, green and blue plugs on a set of component AV cables into the Video Out jacks on the cable TV box, matching the plug colors to the jacks.
Connect the plugs on the other end to a set of Video In jacks on the back of the Yamaha receiver. Make a note of which jacks are used for the connection. Each set of jacks is labeled on the receiver.
Insert the audio plugs on the component cables into the Audio Out jacks on the cable box, using the white plug for the left channel and the red plug for the right.
Attach the plugs on the other end to the Audio In jacks on the Yamaha receiver.
Use a second set of component AV cables to connect from the AV Out jacks on the Yamaha to the AV In jacks on the HDTV only if an HDMI cable was not used.
Check the settings on receiver in the SETUP menu / HDMI / Audio. Here you can choose Amp (sound goes from the speakers connected to receiver), TV (receiver is muted and sound is routed via HDMI to TV) and Amp+TV (sound goes from speakers and also to TV). Also check in OPTION menu / Signal Info that receiver is receiving sound in recognized format.
1) Check to see if the screen says "EXT DECODER". If it does, press the EXT DECODER button again and this should fix the problem
2) Press input mode button until the display reads auto or digital. It may be set to analog.
Is Yamaha HTR-640 a receiver? Try HDMI from PS3 to receiver or Sony HDTV. If HDMI from PS3 to receiver the you need and HDMI from receiver to out Sony HDTV. You could connect everything to receiver and HDMI out to HDTV. You can not have an HDMI cable AND an optical cable coming out of the PS3, only one or the other.