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Thread: Best Way To Boost Voltage From Onboard Soundcard? - Linedriver?

  1. #21
    MySQL Error scott_fx's Avatar
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    upping the voltage; in a correctly set up system wont increase the 'volume' or spl. the main advantage has to do with noise that is picked up along the rca's (higher voltage allows you to turn the gain down on the amp... so any noise that you have picked up along the way isn't getting amplified as much as if you had lower voltage and had to turn up the gain at the amp)

    if your amp is running hot then you should check to make sure you have a solid ground connection at the chassis and also using the correct gauge wire. if it's too small or not a good enough contact then you're asking your amp to do a lot more work to get the same power.

    also. wire each speaker up to a separate channel. you're losing a little power doing it the way you are now. 75watts/2 speakers < 50watts/1 speaker
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  2. #22
    Car Audio Moderator durwood's Avatar
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    Yep^

    To get louder, you would have to spend money, no free lunch.

    The easiest route, add another amp, either a 4 channel that can be bridged to get about 150X2 or a two channel that does about 150X2. Then bridge your alpine so that it is wired to produce 150x2 (see manual or markings on the amp for speaker connection). Then you should be near equivalent to your friends setup in terms of overall loudness. The amps might run cooler too because you might not be straining them as much now that you have increased the potential power capability.

    You might have to make sure your power wiring can support the extra current needed to power multiple amplifiers. There are charts around the web that can tell you recommended wiring/length for a given amount of power.

    But now you know and hopefully can use this knowledge in the future if it's not something you will change now.
    Last edited by durwood; 03-09-2011 at 12:04 PM.

  3. #23
    Variable Bitrate we87's Avatar
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    Im confused. If I bridge the speakers wouldnt I be getting 150x2 (with two speakers per channel) so technically 75 watts per speaker?

    Taken from Alpines site:

    RMS Power (at 14.4V THD+N, 20-20kHz)

    * Per channel into 4 ohms: 50W x 4 (0.08% THD)
    * Per channel into 2 ohms: 75W x 4
    * Bridged 4 Ohms: 150W x 2
    http://www.alpine-usa.com/product/view/mrp-f300/

    Or do I just have them wired up wrong?

    ---------- Post added at 06:45 PM ---------- Previous post was at 06:32 PM ----------



    OKay, this is how I have my speakers hooked up. Like I said, the guy who sold me the speakers explained this to me in detail to have them hook up this way. Is the the wrong way to "bridge" the 4ohm speakers on this amp?
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  4. #24
    MySQL Error scott_fx's Avatar
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    nope.. you would have to run your pink wire to the far right terminal. the dark blue to far left terminal on the lower set of screws, and the light blue to the far right terminal on the lower set of screws. if that makes sense... in order to get 150 watts bridged.
    Last edited by scott_fx; 03-09-2011 at 06:58 PM.
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  5. #25
    Car Audio Moderator durwood's Avatar
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    Notice where it says bridged? You use those two terminals for each pair of channels to bridge. However when you do this it can only handle a 4 ohm load or higher, meaning only one speaker for each pair of channels and the other pair of speakers will need another amp.

    The way you have it hooked up is stereo 2 ohm because two paralleled 4 ohm loads creates a 2 ohm load. Then the power is shared equally so you really only have 37.5W for each speaker which is less than what it would be setup in 4 channel stereo mode. So right now, you are straining one pair of channels and not even getting maximum power, while the other set of channels goes unused.

    Also, if that is how you have it connected, you are running a mono front setup, and a mono rear setup since L and R are connected to the same channel. If you are not going to add another amp in the mix, then connect it stereo 4 channel mode with L on the odd channels and R on the even channels and call it a day. If in doubt RTM.
    Last edited by durwood; 03-09-2011 at 09:25 PM.

  6. #26
    Variable Bitrate we87's Avatar
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    Well.....ain't that something....lol

    I'll connect them in four channels then. Thanks again everyone for all of the amazing information.
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  7. #27
    MySQL Error scott_fx's Avatar
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    Quote Originally Posted by durwood View Post
    Notice where it says bridged? You use those two terminals for each pair of channels to bridge. However when you do this it can only handle a 4 ohm load or higher, meaning only one speaker for each pair of channels and the other pair of speakers will need another amp.

    The way you have it hooked up is stereo 2 ohm because two paralleled 4 ohm loads creates a 2 ohm load. Then the power is shared equally so you really only have 37.5W for each speaker which is less than what it would be setup in 4 channel stereo mode. So right now, you are straining one pair of channels and not even getting maximum power, while the other set of channels goes unused.

    Also, if that is how you have it connected, you are running a mono front setup, and a mono rear setup since L and R are connected to the same channel. If you are not going to add another amp in the mix, then connect it stereo 4 channel mode with L on the odd channels and R on the even channels and call it a day. If in doubt RTM.
    duh.. i totally overlooked the fact that he'd be running 2 ohm to those channels. thanks for catching that
    New System in progress:
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    Phaze TD1500 ~> Seas g18rnx/p
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    Transflective Xenarc

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