When does 1 + 1 = 3? (Audio).
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Outstanding HDF Member
Joined: Jul 2007
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From: Woodinville, WA
When does 1 + 1 = 3? (Audio).
So I'm looking at the instructions for the Boom! Amp and they say that it'll add as much as 8 amps of additional load at full volume.
Quick calculation. Watts = volts x amps
12volts x 8 amps = 96 watts. Amp states it's 75w x 4.
Now a watt is a watt. There's no getting around that. It's a joule per second. A unit of power ie rate of energy consumption.
So, something don't add up . . .
My best guess is that the 75 watt claim simply applies to peak power output, not sustained. Further, I think this practice is common in the audio industry, but it's a little fishy.
Quick calculation. Watts = volts x amps
12volts x 8 amps = 96 watts. Amp states it's 75w x 4.
Now a watt is a watt. There's no getting around that. It's a joule per second. A unit of power ie rate of energy consumption.
So, something don't add up . . .
My best guess is that the 75 watt claim simply applies to peak power output, not sustained. Further, I think this practice is common in the audio industry, but it's a little fishy.
Last edited by davessworks; Jul 31, 2014 at 11:52 PM.
Road Captain
Joined: Jul 2007
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From: Left Ohio for the middle of no where in Fla.
I've always had a bit of a problem with audio wattage claims.
Is it actually 12 volts? there sure is hell isn't 12 volts going to the speakers.
The radio may draw 12 volts for power but that 12 volts can't make it all the way through the radio to the speakers, there is some inefficiency, which produces heat and that alone reduces the wattage.
Is it actually 12 volts? there sure is hell isn't 12 volts going to the speakers.
The radio may draw 12 volts for power but that 12 volts can't make it all the way through the radio to the speakers, there is some inefficiency, which produces heat and that alone reduces the wattage.
Tourer
Joined: Sep 2010
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So I'm looking at the instructions for the Boom! Amp and they say that it'll add as much as 8 amps of additional load at full volume.
Quick calculation. Watts = volts x amps
12volts x 8 amps = 96 watts. Amp states it's 75w x 4.
Now a watt is a watt. There's no getting around that. It's a joule per second. A unit of power ie rate of energy consumption.
So, something don't add up . . .
My best guess is that the 75 watt claim simply applies to peak power output, not sustained. Further, I think this practice is common in the audio industry, but it's a little fishy.
Quick calculation. Watts = volts x amps
12volts x 8 amps = 96 watts. Amp states it's 75w x 4.
Now a watt is a watt. There's no getting around that. It's a joule per second. A unit of power ie rate of energy consumption.
So, something don't add up . . .
My best guess is that the 75 watt claim simply applies to peak power output, not sustained. Further, I think this practice is common in the audio industry, but it's a little fishy.
Yes, 75 watt PEAK unless otherwise stated.
Thread Starter
|
Outstanding HDF Member
Joined: Jul 2007
Posts: 3,341
Likes: 9
From: Woodinville, WA
I've always had a bit of a problem with audio wattage claims.
Is it actually 12 volts? there sure is hell isn't 12 volts going to the speakers.
The radio may draw 12 volts for power but that 12 volts can't make it all the way through the radio to the speakers, there is some inefficiency, which produces heat and that alone reduces the wattage.
Is it actually 12 volts? there sure is hell isn't 12 volts going to the speakers.
The radio may draw 12 volts for power but that 12 volts can't make it all the way through the radio to the speakers, there is some inefficiency, which produces heat and that alone reduces the wattage.
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Thread Starter
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Outstanding HDF Member
Joined: Jul 2007
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Likes: 9
From: Woodinville, WA
Not me. That's my point. Power out cannot exceed power in. If it could we'd have just solved the energy crisis.
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Thread Starter
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Outstanding HDF Member
Joined: Jul 2007
Posts: 3,341
Likes: 9
From: Woodinville, WA
No it can't! That's physically impossible.
The total power out of the amplifier cannot exceed the total power in to the amplifier. That would defy the laws of physics. Furthermore the amplifier inputs are line inputs, not the amplified signals that would go from the head unit to the speakers without using the add on amplifier - so there's no power to speak of coming from the head unit.
Last edited by davessworks; Aug 1, 2014 at 12:50 PM.