The brand of Rockwood, I'm sorry to say, is not good. They get the name by robbing "Rock" from Rockford Fosgate, and "wood" from Kenwood, to be misleading. If you have big plans for your stereo, i would not recommend using them. Having said all that, they might do the trick and last for years if you are not the type to abuse them. I have a Road Gear amplifier I bought from WalMart 10 years ago that I refused to toss out and now have it in my work truck. Again, the brand may not be good but sometimes specific items are. Good Luck.
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The body price of your Samsung SGH-i450 Cellular Phone may be flexible as there or many quality in the market.You can get your body in local market around 300 rs.If you want center body also it may cost you more that 600rs.If you willing to buy a good quailty body means you can get that around 800rs.If you require center body means it may cost you around 1500rs.So think twice about changing your cellular Phone body. You should keep in mind another thing that is it may be not fit 100%.
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I think you've just answered your own question. It sounds as if you've coned the sub woofer. Meaning you've fractured the bond between the edge of the speaker body with the speaker cone. Or overheated the voice coil and it's distorted and not getting free movement. Excuse the Pun but it "sounds" like you need a new speaker as a replacement. If it's a particularly expensive speaker it can be reconed. A check of the Net for someone close to you will find a company who recones them. If it's a cheaper one then a replacement would be in order.
The problem are worsen that before. It is wisely to replace both left and right amplifier
IC, but make ensure that the power supply feed a good amount of voltage to amplifier,
Also a strong good signal. Be sure to measure it.
apply a good contact cleaner in this button and press it many times.confirm good connection between amplifier output and speaker b.connect speaker A insted of speaker B if it is working the problem will be in cabel and speaker B if not the problem in your amp output stage.
I would actually suggest connecting the speakers up like that because the preamp that is used in the S750 is not very good even though the actual amps are good. I would also recommend using a different sub since it is very difficult to bypass the amp for the sub. Using a different amp could also provide more volume you would just have to make sure that you don't blow the speakers. I have a set of S750's but I have not been able to find anything to tell me the exact power handling that the speakers are capable of but I believe that they can handle a lot more than what the internal amplifier is putting out.