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09-07-2011, 09:54 AM
| | Registered User | | Join Date: Sep 2011 Location: Krotz Springs, LA | | | Amplifier Modification
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This is my first time posting here, and I'm not sure if this thread should be under Amps, Hardware, or some other category, but I chose this one. I currently have a (crappy) Fender SP-10 Guitar Amp that I've been using, at least until I can get a new one (So broke), and I'm wanting to rewire it so that the sound goes through a bass tube that I have sitting in my bedroom. Anybody know a way that I could possibly do this? Any help at all would be appreciated!!! 
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09-07-2011, 10:18 AM
|  | Registered User | | Join Date: Aug 2007 Location: Toronto Ontario Canada | | | This is very simple to do if you have some technical skill. First you have to find out what the impedance of the internal driver is and then the impedance of the tube. This is required to ensure that the new connections will not destroy your amp. Remember that any kind of subwoofer will not sound great stand alone for a bass.
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Paul
Last edited by BassmanPaul : 09-07-2011 at 11:51 AM.
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09-07-2011, 10:35 AM
| | Registered User | | Join Date: Sep 2011 Location: Krotz Springs, LA | | | Ok, thank you. And I did not realize that (New to amps, been tolerating my crappy SP-10). Is there a way that I would be able wire it so that sound goes through BOTH the stock speaker from the amp and that bass tube? I used to be in an Electronics class, so I know it should be possible to do easily, but I just can't remember how.
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09-07-2011, 10:36 AM
| | Registered User | | Join Date: Jan 2006 Location: Brookfield, CT | | | Bad idea. First of all, you'll get nothing but ultra low end from the tube, no note definition at all. Second, most of those tubes have internal amps. If so, forget it.
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09-07-2011, 12:31 PM
| | | | If the SP10 has a line out or has a headphone out that doesn't mute the internal speakers then you can hook that up to the input of your bass tube, assuming it is self powered. |
09-07-2011, 02:45 PM
| | Registered User | | Join Date: Sep 2011 Location: Krotz Springs, LA | | Quote:
Originally Posted by WingKL If the SP10 has a line out or has a headphone out that doesn't mute the internal speakers then you can hook that up to the input of your bass tube, assuming it is self powered. | Nope, sorry. There's a headphone output, but it mutes the amp, and the tube isn't self-powered. It's original use is to go in a car (Or other vehicle of your choice), but I've had it setup to the stereo in my room for a few years, and that's what gave me the original idea of trying to hook it to my bass. Also, the tube doesn't have a jack input, just a +/- dual-cord 
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Courage isn't the lack of fear. Courage is the ability to face your greatest fears in order to follow your dreams.
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09-07-2011, 05:01 PM
| | Registered User | | Join Date: May 2006 Location: austin,tx | | | If you don't know any of the impedances involved, you can protect the amp by wiring the 2 speakers in series. Whatever they are, it will be higher than the combo's speaker by itself. Disconnect the wires from the combo's internal speaker, you now have an amp head and 2 speakers that aren't hooked up. Put the + wire from the amp to the + of 1 speaker, the - from the amp to the - of the other speaker, then run a jumper connecting the remaining open + and -. Amp power will drop, speaker count will double, overall volume would remain somewhere around the same but it'll have some lows. If it sounds too weak, try reversing the wires on one of the speakers, pick which ever way sounds best. Pretty rigged up but it can be done without killing the amp. Use the eq knobs to help balance the sound. |
09-07-2011, 05:24 PM
| | Registered User | | Join Date: Sep 2011 Location: Krotz Springs, LA | | Quote:
Originally Posted by will33 If you don't know any of the impedances involved, you can protect the amp by wiring the 2 speakers in series. Whatever they are, it will be higher than the combo's speaker by itself. Disconnect the wires from the combo's internal speaker, you now have an amp head and 2 speakers that aren't hooked up. Put the + wire from the amp to the + of 1 speaker, the - from the amp to the - of the other speaker, then run a jumper connecting the remaining open + and -. Amp power will drop, speaker count will double, overall volume would remain somewhere around the same but it'll have some lows. If it sounds too weak, try reversing the wires on one of the speakers, pick which ever way sounds best. Pretty rigged up but it can be done without killing the amp. Use the eq knobs to help balance the sound. | Thank you sir! I will definitely try it!
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09-07-2011, 06:07 PM
|  | keepin' the beat since the 60's | | Join Date: Dec 2007 Location: Studio City, SoCal, USA | | | Will33's idea is a good one, and safe for your amp. The tube should add some extra bottom that the cheap amps don't have (although it may be boomy or muddy) and connecting them in series cannot hurt your amp.
If you don't like it, you just change back.
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