I have Philips 5.1 Home Theatre System. It does not output sound from Center and Two Rear Speakers. Model is HTB5510D

SOURCE: 4 ohm and 8 ohm speakers

You can plug in higher ohm speakers , the higher the ohm the higher the resistance is, it is a danger when you plug lower ohm speakers into a higer ohm Amp , at a high volume that will cause them to blow , the center speaker would be fine to use a higer ohm speaker , your best choice is to buy a Active Subwoofer, which means the sub has it's own power supply , and u can blast the thing as much as u like , thn u can turn the bass down on all the other speaker's so u can play it louder , and have the sub turned up has high as u like , this is the best way to get great sound with high volume , buy a Active sub woofer , any active subwoofer is ok , a active sub woofer has its own volume and inputs on the speaker ,

SOURCE: my philips 32pf5521d/10 tv will

Access your TV menu to select the proper screen format...accordianman

SOURCE: Home theatre but TV without audio outlet

I would suggest that you smash
Philips HTS w/a hammer!
I had better sound from TV alone! Only 2 speakers put out sound from TV. Recordings from DVR can not be heard very well w/all volumes at max. System sucks! You get what you pay for! $2500 LCD TV sounds worse w/Philips HTS than my son's $300 TV! ALL cables hooked up as instucted!!!!

SOURCE: Just bought a Philips home theatre system HTS3544 low sound?

You may also need to change the speaker set up. Go to DISC setting (one of the top selections on the remote) make sure you have no Disc in the DVD player. When in this mode press setup on the remote. On this menu you will have a option to adjust the speaker volume.

I had to increase my speaker volumes to get better sound. This setting is not accessible if you try to do the set up in other than DISC setting. Be sure to check the SURROUND setting. The SURROUND button on the remote will toggle between stereo and surround as stated in a previous post.

ST

SOURCE: LG dvd player connected to 5.1 home theatre

Dont now your sytem but check Home theatre sytem must be switch to 5.1 display and not dvd display. if stil no sound check in setup off dvd for soundsetting like PCM, RAW , 5.1etc and select each one till you get desired sound.

Presume your conections from dvd to hometheater is conected 5.1 cables or 1 digital cable and not stereo(2cables)