Pre Out Voltage too low for amp

Hi guys,

This is more of a theory question than an actual problem

Say you ave a HU that has a 2 Sets or preouts that are rated at only 2000mV each
Say you have an amp (500 watt Mono) that has gain settings from 2-5V only

The amp will still make 500 watts no matter what its gain settings are set at correct?
what are some issues that can arise from not having a higher preout voltage

Thanks all

--Skold

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2004 Honda Civic Ex 4Dr

Kenwood DDX-7015/W Nav
4 Fosgate T152C
Hifonics Brutus BX1500D
RE XXX 12 in a 4 Cube Snail Shell

In this case, theoretically, the gain would be at 100% (set to 2v) to make the full 500 watts.  This is all in theory, assuming you have a good power source, and your ohm load on the amp is correct.  Note that if you had a deck with a 1v preout, you would not get the full 500 watts unless you had a line driver/ preamp to boost this voltage.

Nothing would be harmed if the gain was properly matched by turning it up all the way.  The higher preout voltages are supposed to help increase the s/n ratio, but as long as the signal is clean, the preout voltage is not so important.

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My ex once told me I have a perfect face for radio.

Let me see if Im following you

So if the amps gain was at 2v (100% gain) it would be at full power (500 watts), but since the HU cant even get 1v out of the preout, the amp actually wont make the full 500 watts but it would still function just at a lower wattage

Of course this is assuming a 100% stable power source and ohm load within the amps spec

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2004 Honda Civic Ex 4Dr

Kenwood DDX-7015/W Nav
4 Fosgate T152C
Hifonics Brutus BX1500D
RE XXX 12 in a 4 Cube Snail Shell

Yes, that's correct.

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My ex once told me I have a perfect face for radio.

So there is an advantage in having a HU that has a good Preout Voltage

Now a way to correct this without buying a new headunit is by adding a Line Driver that has a selectable voltage range yes/no?

Ok I think its all sinking in the old noggin

Thanks

--Skold

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2004 Honda Civic Ex 4Dr

Kenwood DDX-7015/W Nav
4 Fosgate T152C
Hifonics Brutus BX1500D
RE XXX 12 in a 4 Cube Snail Shell

Yup, looks like you've got it.

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My ex once told me I have a perfect face for radio.

Sweet

Thanks for your help

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2004 Honda Civic Ex 4Dr

Kenwood DDX-7015/W Nav
4 Fosgate T152C
Hifonics Brutus BX1500D
RE XXX 12 in a 4 Cube Snail Shell

Umm... correct me if I'm wrong here but isn't 2000mV the same as 2V.

I guess is depends on if your talking about millavolts or millivolts.

Paul

mV is millavolts isnt it thats what my pocket electrical guide says


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2004 Honda Civic Ex 4Dr

Kenwood DDX-7015/W Nav
4 Fosgate T152C
Hifonics Brutus BX1500D
RE XXX 12 in a 4 Cube Snail Shell

Well then yea, 2000mV would be 2V. So at full output (which most HU's won't do RMS) you get 2V.

Paul

...and another thing... There is no such thing as a millavolt. It's a millivolt...

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It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

haemphyst wrote:

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...and another thing... There is no such thing as a millavolt. It's a millivolt...

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Actually this pockect electrical guide I have from 1967 has Millavolt, and Millaamp as well as millivolt and milliamp
so unless this is a typo and no one decided to tell my teachers from the 70's till the present than we have milla's down here in florida, but who knows were always ranked near last in education anyway

Later

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2004 Honda Civic Ex 4Dr

Kenwood DDX-7015/W Nav
4 Fosgate T152C
Hifonics Brutus BX1500D
RE XXX 12 in a 4 Cube Snail Shell

1967!?! Today, a typo, pure and simple... Dictionary.com came up with nothin' for millavolt or millaamp, and it even corrects you... You'll notice, the prefix is "milli-" NOT "milla-" 1967, it MAY have been semi-correct, but I'm still putting my money on typo, and bad editing...

Let's get a more current electrical phrase book, something written in the last, say, oh, 30 years... That thing is older than I am, and we've come a long way, baby!...

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It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

1967...when they first came out with minaskirts.

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Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

1967, the year I got my driver's lisence... those minaskirts were boss, and the coolest car you could get was one of those English Mina Coopers.

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