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?
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?
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.
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.
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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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.!
Banned
Joined 2002
Banned
Joined 2002
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.
Depends on the chip though. I think the best option for him would be a Tripath TK2050 based design. Probably beats any discrete or chipamp design, no matter what money you throw at it too.
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Yes, to get more power out of a low voltage, a car 12V battery. Essentially the same issue as what this guy has.
The Eminence Alpha-6C is a fairly high efficiency 4 Ohm midrange. It's also fairly flat and maybe tolerable sounding. But it is not efficient enough for 115dB from split 15 volt supplies.
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Will that run from +-15 Volts? I thought he had a required supply limitation for some reason.
It'll run on anything from about 10V to 40V but with a 4 Ohms load and bridged his 30V supply will be just right as the chip is limited to 100W output.
Just depends on how many you use
But horn designs is a far better option, for example the DR250 (http://www.billfitzmaurice.com/DR250.html) will have 105dB/w/m with a fairly standard 10" PA driver. Only takes 10 Watts to get that to produce 115dB at 1m ... or roughly 90 Watts for 115dB at 10 feet. Build the version with 2 10" PA drivers and 115dB at 10 feet is easily within reach on the afore mentioned amplifier on a 30V supply.
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OOOps . excuse me !! Got mixed up with detectable increase of sound level by the human ear , which is 2db
OOOps . excuse me !! Got mixed up with detectable increase of sound level by the human ear , which is 2db
No biggie. It looks like we're running away with this guy's thread anyway. He wasn't real clear about his objectives.
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