Replacing a passive subwoofer and adding side speakers - AVS Forum
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post #1 of 5 Old 01-20-2012, 02:19 PM - Thread Starter
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My family is finally upgrading our basement home theater. We're replacing our 15 year old rear projection TV, and receiver. We've gotten a new Benq W6000 projector , Panasonic Blu Ray player, and a Yamaha RX-V571BL 7.1 AV Receiver. I was planning to keep my old 5.1 speakers because they sound pretty good. But, I went to hook up my old speakers and found that my subwoofer won't work. It has speaker wire and the receiver wants a mono pin. So it looks like I need a new subwoofer. Or is there an adaptor? Also, since the new Yamaha is 7.1, I was thinking I might add the two extra speakers. But I don't know what subwoofer I should get, and what side speakers I should get. Or should I move the back speakers to middle and get new back ones. Or should I toss all the speakers (gulp) and get all new ones. If I just add on then I'm not sure what size or brand or does it matter? Help, please.

My 15 year old speakers are:

Front two: Technics SB-LX70 200W (music) 100W (DIN)
Back two: Technics SB-AFC32A 260W (music) 130 W (DIN)
Subwoofer: Technics SB-W33 200W (music) 100W (DIN)
Center speaker: Cambridge Soundworks Center Channel II or Plus (don't know wattage but it is 25 wide by 4 ½ high)

Thanks so much for your help!
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post #2 of 5 Old 01-21-2012, 05:26 AM
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By far the most straightforward solution to purchase a powered subwoofer. An rca cable runs from the AVR to the subwoofer. Check Radio Shack or monoprice.com for the rca cable.

People in this forum like the BIC F12 subwoofer at around ~$200. You could also consider the new Parts Express SUB-120 at <$130.
http://www.parts-express.com/pe/show...number=300-629

At under $300, individuals like the BIC PL-200 subwoofer. You need to check the respective forums for how to get the best price.
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post #3 of 5 Old 01-21-2012, 07:03 AM
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I would suggest that you stick with the 5 speakers you have. You seem to like the sound, and if you add two more speakers there is a high probability that your receiver will not have enough total power to drive all seven.

That receiver has a 100 watt per channel rating for 2 channels, but its power supply is only about 350 to 400 watts or so total. That is not enough for seven channels, despite the manufacturer's misleading specifications. They lie.

That means it can drive 5 channels to 70 or 80 watts each, maybe, but with all seven channels driven it will be lucky to put out 45 watts per channel; some will only do 35 or 40 watts per channel, which is completely inadequate.

If you really want to go to 7 channels, you will need to get a 100 watt per channel or larger stereo power amplifier to drive the front two channels, and then the receiver will have enough power to drive the remaining 5 channels.

Your speaker power ratings you quoted there are the MAXIMUM power that you can drive them with without overheating the voice coils and damaging them. You don't have to worry about overdriving them with your receiver; it doesn't have enough power.

A minimum for a subwoofer IMO would be one with a 350 watt RMS amplifier and a 12-inch driver.

You will probably not get an adequate one for under $300, so shop around and see what is available.

The Polk Audio PSW505 is one that might be OK; Amazon has it for $290 right now.








Quote:
Originally Posted by Clueless1609 View Post

My family is finally upgrading our basement home theater. We’re replacing our 15 year old rear projection TV, and receiver. We’ve gotten a new Benq W6000 projector , Panasonic Blu Ray player, and a Yamaha RX-V571BL 7.1 AV Receiver. I was planning to keep my old 5.1 speakers because they sound pretty good. But, I went to hook up my old speakers and found that my subwoofer won’t work. It has speaker wire and the receiver wants a mono pin. So it looks like I need a new subwoofer. Or is there an adaptor? Also, since the new Yamaha is 7.1, I was thinking I might add the two extra speakers. But I don’t know what subwoofer I should get, and what side speakers I should get. Or should I move the back speakers to middle and get new back ones. Or should I toss all the speakers (gulp) and get all new ones. If I just add on then I’m not sure what size or brand or does it matter? Help, please.

My 15 year old speakers are:

Front two: Technics SB-LX70 200W (music) 100W (DIN)
Back two: Technics SB-AFC32A 260W (music) 130 W (DIN)
Subwoofer: Technics SB-W33 200W (music) 100W (DIN)
Center speaker: Cambridge Soundworks Center Channel II or Plus (don’t know wattage but it is 25” wide by 4 ½ “ high)

Thanks so much for your help!

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post #4 of 5 Old 01-22-2012, 08:41 AM - Thread Starter
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Quote:
Originally Posted by commsysman View Post

I would suggest that you stick with the 5 speakers you have. You seem to like the sound, and if you add two more speakers there is a high probability that your receiver will not have enough total power to drive all seven.

That receiver has a 100 watt per channel rating for 2 channels, but its power supply is only about 350 to 400 watts or so total. That is not enough for seven channels, despite the manufacturer's misleading specifications. They lie.

That means it can drive 5 channels to 70 or 80 watts each, maybe, but with all seven channels driven it will be lucky to put out 45 watts per channel; some will only do 35 or 40 watts per channel, which is completely inadequate.

If you really want to go to 7 channels, you will need to get a 100 watt per channel or larger stereo power amplifier to drive the front two channels, and then the receiver will have enough power to drive the remaining 5 channels.

Your speaker power ratings you quoted there are the MAXIMUM power that you can drive them with without overheating the voice coils and damaging them. You don't have to worry about overdriving them with your receiver; it doesn't have enough power.

A minimum for a subwoofer IMO would be one with a 350 watt RMS amplifier and a 12-inch driver.

You will probably not get an adequate one for under $300, so shop around and see what is available.

The Polk Audio PSW505 is one that might be OK; Amazon has it for $290 right now.

I had researched receivers online and talked to salespeople, and was spending about $450 so I thought I was getting a good receiver, but this sounds like maybe not. One guy told me to add my speakers' wattage, then another person told me that didn't matter. I've only had the Yamaha two weeks from Amazon. Do you think I should return it and get a "better" one? If so, Like what?
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post #5 of 5 Old 01-22-2012, 10:43 AM
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For about the same price, the Yamaha V667 and the A700 have better amp sections than the V571 and the other lower Yamaha models which use some kind of chip amp; as I understand it, the higher models have discrete amps for the channels. The Onkyo TX-NR609 and Denon 1712 are two other good performers at this price. Choose any of those that has the features you like the best, although the Denon gets the edge for me because of the excellent Audyssey MultiEQ XT calibration software that will automatically EQ your sub for your room. Compare the receivers for your needs, though.

Stay with 5.1 and focus your budget on the sub. You'll get better return for your money there over adding two more speakers. Here are three different 12" subs that are good for HT, all with good performance ratios for their price: BIC F12 for under $200, BIC PL-200 for under $300, and then the Outlaw Audio LFM-1 EX currently on sale for $549. I have the EX. It's definitely worth the extra money if you can stretch that far, and beats out subs selling at BestBuy for $1200 or more.

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