SQ Head Units

[pwnt by pat 10+ year member]

I wish I would have gotten that rf8250... seller never shipped and I got my money back //content.invisioncic.com/y282845/emoticons/crying.gif.ec0ebefe590df0251476573bc49e46d8.gif

 

[bri487 5,000+ posts]

Voltage is pretty insignificant, to say the least.
Personal experience; I switched from a Denford 8240 to an Eclipse 8053 (8V outputs)...and I can't say that I really liked the Eclipse more.

The Denon decks have more than adequate preout voltage.

And no, springy, that deck on the woofersetc webpage that you linked is definitely not the Denford.

RFX-8250Ti

RFX-8240

when you start to run multiple amps and what not, it becomes important. if output voltage is insignficant, then why is 8v and what not highly spoken of and why are people *****ing about companies going to 2v instedd of 4v?

 

[squeak9798 5,000+ posts]

when you start to run multiple amps and what not, it becomes important.

Umm...nope, not really.

if output voltage is insignficant, then why is 8v and what not highly spoken of and why are people *****ing about companies going to 2v instedd of 4v?

High preout voltage is "nice", because it allows you to lower the gain setting, theoretically increasing the SNR. But, given you have a quality amplifier that has no noise with a higher gain setting (like most any amplifier on the market today), you gain absolutely nothing by using a higher voltage preamp output.

Maybe people are bitching because they are misinformed or don't understand the impact of preout voltage?

But, again, the Denfords and other Denon headunits have more than adequate preout voltage.

 

[bri487 5,000+ posts]

Umm...nope, not really.


High preout voltage is "nice", because it allows you to lower the gain setting, theoretically increasing the SNR. But, given you have a quality amplifier that has no noise with a higher gain setting (like most any amplifier on the market today), you gain absolutely nothing by using a higher voltage preamp output.

Maybe people are *****ing because they are misinformed or don't understand the impact of preout voltage?

But, again, the Denfords and other Denon headunits have more than adequate preout voltage.

keeping noise out of the signal is the result of keeping the gains down which you are allowed to do by using a stronger output signal. the denons were clean sounding decks, but lacked the output voltage to keep all the noise out. so in reality, the higher voltage is essential to SQ.

and when you use multiple amps off the same pre out, you lose signal because its split so many times. and when you use a line driver or something of the sort, it is another link in the chain letting noise enter the signal path.

 

[squeak9798 5,000+ posts]

keeping noise out of the signal is the result of keeping the gains down which you are allowed to do by using a stronger output signal. the denons were clean sounding decks, but lacked the output voltage to keep all the noise out. so in reality, the higher voltage is essential to SQ.

If you had noise in your system with a lower preout voltage, then the problem was the amplifer and not the signal strength. Any quality amplifier should have near zero audible noise regardless of gain setting.

Preout voltage is anything but essential to sound quality. Anyone who says such a thing is quite simply misinformed and/or ignorant. 2V or higher (which the Denons have) is more than adequate. Anything more is a vanity.

and when you use multiple amps off the same pre out, you lose signal because its split so many times.

You would have to split it quite a few times before the signal strength decreased by a noticeable amount. Split it once, and you may lose hundredths of a volt. Split that one signal twice, and you may lose .1V. Is .1V going to make a noticeable difference anywhere in the system?

I don't know too many people, honestly, who split a single RCA more than once or twice. Most people splitting it at all use different avenues such as amplifier pass through outputs, electronic crossovers, etc. If you have to split a single preamp output more than twice (hell, more than once), I think it's time to rethink your system layout.

 

[bri487 5,000+ posts]

Preout voltage is anything but essential to sound quality. Anyone who says such a thing is quite simply misinformed and/or ignorant. 2V or higher (which the Denons have) is more than adequate. Anything more is a vanity.

you're right, those darn audio companies are sure ignorant.//content.invisioncic.com/y282845/emoticons/crazy.gif.c13912c32de98515d3142759a824dae7.gif

 

[squeak9798 5,000+ posts]

you're right, those darn audio companies are sure ignorant.//content.invisioncic.com/y282845/emoticons/crazy.gif.c13912c32de98515d3142759a824dae7.gif

No, their marketing.

I can see someone reads all of the nice little marketing info like a good little consumer //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

 

[bri487 5,000+ posts]

No, their marketing.


I can see someone reads all of the nice little marketing info like a good little consumer //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif

actually i am not too sure as to what is out there at the moment. i was discussing it a while ago with a big local dealer that i know outside of being a customer. and i was discussing the whole denon pre-out voltage thing with a guy that does zapcos testing.

 

[OldOneEye 10+ year member]

Big difference between the two if you ask me. If we are talking about competition decks, you want the RFX 8250 over the 8240. Balanced output, different DAC, more preout voltage. I love mine, glad I convinced my boss to let us sell these on cardomain, we sold a couple hundred. I wish I had bought a bunch of them, oh well.

Juan

The 8240 had 2v preouts and the 8250Ti had 5v preouts.
Unless you have an incredibly high noise floor in your source material that should be more than enough for the average consumer, I would think...

 

[foomasta69 10+ year member]

what about if you were spliceing into a stock amp/sub setup, such as in my 98 ford explorer where i have to splice a RCA cable and hook that up, would higher voltage preouts effect that??

heres a link of wha i would have to do...

http://www.explorerforum.com/forums/showthread.php?t=154055

 

[drewnashty]

Higher pre-out voltage also helps put less stress on your amps, because they recieve a stronger voltage that they don't have to work as hard to put out the same amount of power. And you can lower the gain level which also puts less stress on them, all in all it also helps them run cooler for longer full blast durations //content.invisioncic.com/y282845/emoticons/naughty.gif.94359f346c0f1259df8038d60b41863e.gif .

 

[squeak9798 5,000+ posts]

Higher pre-out voltage also helps put less stress on your amps, because they recieve a stronger voltage that they don't have to work as hard to put out the same amount of power. And you can lower the gain level which also puts less stress on them, all in all it also helps them run cooler for longer full blast durations //content.invisioncic.com/y282845/emoticons/naughty.gif.94359f346c0f1259df8038d60b41863e.gif .

That's not really true at all either.

 

[desertheat 10+ year member]

Higher pre-out voltage also helps put less stress on your amps, because they recieve a stronger voltage that they don't have to work as hard to put out the same amount of power. And you can lower the gain level which also puts less stress on them, all in all it also helps them run cooler for longer full blast durations //content.invisioncic.com/y282845/emoticons/naughty.gif.94359f346c0f1259df8038d60b41863e.gif .

uh..... 1/3 of my brain just failed to work after reading that... Now I hate you! I only have 10/6th left!

 

[SuperTrooper 10+ year member]

Man this is some good stuff. Threads like this is where us "non-professionals of car audio" learn the most. But one thing I learned a while back is squeak9798 knows his s*@t.

 

[desertheat 10+ year member]

Yeah squeek knows a few things //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

I can add in the cd7000 from eclipse... spec wise she is a beauty for sq.... but I will not get to try her out until end of the week / early next week!