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Old 12th November 2009, 03:51 PM   #1
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Question Tips on making my amplifier louder?

I am trying to create a warble tone at 115 dB at 10 feet.

I have been playing around with several different amplifiers (tda2003, tda2030, and tda2040), none of which have been able to give me the volume I need for this project. I heard 115 dB at best.

I am limited to a +/- 15VDC rail voltage and I am currently using a 8 ohm stereo speaker with a horn.

Does anyone have any tips (should I look into getting a different horn?) or alternative amplifiers that could give me the volume I need?
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Old 12th November 2009, 04:27 PM   #2
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More efficienct speakers would certainly help...
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Old 16th November 2009, 07:00 PM   #3
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remember for every 2db increase u need TWICE the power !!
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Old 16th November 2009, 07:12 PM   #4
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Every 3dB up the power requirement doubles. With such severely limited voltage it probably makes sense to focus on speaker efficiency since the amplifiers will vary performance by a piece of a dB into 8 ohms. What you'd really like is a speaker that will give you that much sound pressure with a couple watts... like a compression driver and horn.
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Old 16th November 2009, 07:17 PM   #5
AndrewT is offline AndrewT  Scotland
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95dB/W drivers are easy to find and not too expensive.
100dB/W speakers are getting expensive and more difficult to source.
105dB/W drivers are available but tend to be very expensive.

100W into 100dB/W @1m drivers will give 120dB@1m, this reduces to about 110dB @3m. I think you have done well to achieve 115dB already.
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Old 16th November 2009, 07:22 PM   #6
jleaman is offline jleaman  Belgium
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Quote:
Originally Posted by AndrewT View Post
95dB/W drivers are easy to find and not too expensive.
100dB/W speakers are getting expensive and more difficult to source.
105dB/W drivers are available but tend to be very expensive.

100W into 100dB/W @1m drivers will give 120dB@1m, this reduces to about 110dB @3m. I think you have done well to achieve 115dB already.
Good food for him! I did this long time ago, loved the fact that i don't need megawatts now to run and listen to music, reality shows that using efficient speakers and some nice amplifiers is pleasant to listen to and enjoy.!
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Old 16th November 2009, 07:25 PM   #7
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High efficiency 4 ohm speaker and a bridged amp. Chips will not cope with this load, you need a discrete design, something special.
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Old 16th November 2009, 07:46 PM   #8
jleaman is offline jleaman  Belgium
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Quote:
Originally Posted by richie00boy View Post
High efficiency 4 ohm speaker and a bridged amp.

I don't think these words go in a sentence.!
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Old 16th November 2009, 08:15 PM   #9
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They just did. What do you think a 4 ohm 15 inch PA speaker is?
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Old 16th November 2009, 08:17 PM   #10
jleaman is offline jleaman  Belgium
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Quote:
Originally Posted by richie00boy View Post
They just did. What do you think a 4 ohm 15 inch PA speaker is?
ok, now run that on a tub amp. I believe 4 ohm was meant for car audio to keep the current and voltage at a certain level for power reasons.
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