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Old 13th July 2005, 06:11 AM   #1
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Default Suggestions for AutoTuba Amplifier

I recently built the AutoTuba by billfitzmaurice for automotive application(of course) and I have been having trouble finding a suitable amplifier for it.

What I'm looking for
100watts RMS into 4 ohms. Variable LP filter(the higher order the better, but anything greater than 12db/octave will suffice) and perhaps a subsonic filter @20hz or so....

The most important thing is that it will do 100watts RMS into 4 ohms... and I'm looking for something cheap <$80.

Any suggestions are greatly appreciated

Thanks guys
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Old 20th July 2005, 03:02 AM   #2
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I like the Alpine V12 amps. 30w x2 will do bridged at least 75 watts and its clean. Find a used one on ebay or something.

I am interested in the autotuba; can you give more details. I won't be able to build one in my single cab taco, but I would like to know how it works out for you for future reference.
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Old 26th July 2005, 05:17 AM   #3
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that seems like asking alot for <$80, higher then12db/oct and variable... A mtx 282 might be ok, cant remember if its variable or not. most of the lower levels of equipment is fixed 12db/octave often at ~80Hz
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Old 27th July 2005, 10:50 PM   #4
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The autotuba is an 8" hornloaded design. Billfitzmaurice came up with it and plans are available for $9.95 US at his website www.billfitzmaurice.com

The horn increases efficiency by acoustically coupling the driver to the surrounding air. On average it runs 10db hotter than a sealed enclosure(according to bill's measurements).

It only has somewhere around 100watts RMS power handling which makes it an easy add on for a car stereo requiring no modification of the electrical system


Come on guys... even pyramid sells cheap amps with variable filters on them..... I said 12db/octave would suffice but PREFERRABLY better.... I just wanted to find something that could be Bridged into 100watts RMS or is Mono into 100watts RMS.... I didnt want to have to buy a 2 channel amp and only use one channel. I can find a 2 channel that will do the trick for that cheap, but I'd rather not have a channel that is being used for nothing....

Any ideas, suggestions just let me know
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Old 28th July 2005, 02:39 AM   #5
oPossum is offline oPossum  United States
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If you don't mind taking a chance on eBay, check out item #7988989132. This is an old amp, but is unused. I am familiar with this amp from when I was involved in car audio in the late 80's - eary 90's. It is a solid 100 W RMS into 2 to 4 ohms. 24 dB/oct low pass, with parametric boost. Speaker and line level inputs.
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Old 31st July 2005, 11:14 AM   #6
B.I.G is offline B.I.G  Romania
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how does this AUTOTUBA sound? i thought that horns are not recomended in cars !?
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Old 31st July 2005, 03:34 PM   #7
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it sounds fine, I havent yet put it in a car for any testing....

Horns are not recomended for cars due to their large size, this horn is fairly small
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