Suggestions for AutoTuba Amplifier

BassAwdyO · 13th July 2005, 07:11 AM

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

honfatboy · 20th July 2005, 04:02 AM

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.

ocool_15 · 26th July 2005, 06:17 AM

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

BassAwdyO · 27th July 2005, 11:50 PM

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

oPossum · 28th July 2005, 03:39 AM

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.

B.I.G · 31st July 2005, 12:14 PM

how does this AUTOTUBA sound? i thought that horns are not recomended in cars !?

BassAwdyO · 31st July 2005, 04:34 PM

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

13th July 2005, 07:11 AM	#1
BassAwdyO diyAudio Member Join Date: Jun 2004 Location: Illinois	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 __________________ The golden rule of DIY: Build nice, or build twice!

27th July 2005, 11:50 PM	#4
BassAwdyO diyAudio Member Join Date: Jun 2004 Location: Illinois	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 __________________ The golden rule of DIY: Build nice, or build twice!

31st July 2005, 12:14 PM	#6
B.I.G diyAudio Member Join Date: Mar 2004 Location: Home	how does this AUTOTUBA sound? i thought that horns are not recomended in cars !? __________________ B.I.G

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20th July 2005, 04:02 AM	#2
honfatboy diyAudio Member Join Date: Dec 2004 Location: Lubbock, TX	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.

26th July 2005, 06:17 AM	#3
ocool_15 diyAudio Member Join Date: Nov 2004 Location: sk	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

28th July 2005, 03:39 AM	#5
oPossum diyAudio Member Join Date: May 2005 Location: Michigan	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.

31st July 2005, 04:34 PM	#7
BassAwdyO diyAudio Member Join Date: Jun 2004 Location: Illinois	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 __________________ The golden rule of DIY: Build nice, or build twice!

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