Pioneer htp-072 vsx-324--k-p

This is a known issue on that unit. Read this forum.

https://www.avsforum.com/threads/help-no-sound-pioneer-vsx-821-k.1507495/

https://www.google.com/search?q=Pioneer+vsx-826-k%2C+no+sound

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Here are some manuals that should help
Pioneer VSX 1122 Reference Manual Pioneer VSX 1122 Reference Manual Pioneer VSX 1122 Specifications

This could be a problem with one (or more) of the built in amplifiers, but first check if all the speaker cables are properly twisted and connected to their posts. There shouldn't be any loose cores that can touch the chassis of the receiver, because this causes a short circuit and makes the receiver go into safety mode (at which it shuts off). Also check the interlinks of the affected source to be sure you don't have some kind of signal loss/interruption.
If this doesn't help or obviously isn't the problem, you should have the receiver checked at a repair centre.

Pioneer VSX-D607S Service Manual
Pioneer VSX D607S Service Manual

Pioneer HTP 071 Operating Instructions Manual

The front speakers go into the sub in the two bottom inputs from the receiver. the two upper are outputs to the actual speakers,SOYOU RUN RUN THE FRONT SPEAKER WIRES FROM THE RECEIVER TO THE INPUT OR LOWER CLIPS ON SUB,THEN RUN WIRES FROM THE OUTPUT OR UPPER CLIPS FROM SUB TO THE FRONT SPEAKERS.

I'm referencing a VSX-1016 manual, so I hope it's close enough to help you find the function...

Somewhere in the System Setup menu you'll find a setting for SUB W. The wrong setting is NO.

Set it to YES or PLUS depending on if you want ONLY the Sub to carry all the bass, or if the Front Speakers will share bass with the Sub, respectively.

pioneer is really good about providing pdf manuals just google pioneer electronics ltd

Unit still under warranty. Best bet is to contact Pioneer for the location of their closest authorized factory repair center and ship unit to them for warranty repair. Or check out ebay for a used unit or parts being sold.

i just installed my htp 100 sw. the scheme was atached to the back of the woofer for me tho. easy. front speakers go into the sub in the two botom inputs from the receiver. the two upper are outputs to the actual speakers. hope it helps