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Mobile Electronics Australia > Mobile Electronics Discussion > Sound Quality Discussion
DD Phil
The Villin ute I've been building was using an Alpine DVD screen combo and the add on processor the PXA H700. It simply isn't up to the game.

All it seems capable of is a two way crossover and time alignment (which I don't need or want). Adjusting sub level takes half an hour and it has the worst system noise I've ever heard.

Is the PXA-H900 a lot better than the 700?

Background noise that rises and falls with the volume control is just not on in 2005!

I need a head unit / processing combination capable of:

DVD / screen
Tweeters 2.5k up
Mids 200-2.5k
Mibass 40-200
Sub 20-60/80

In a pinch I can use the amp crossovers for sub and midbass high pass, so a 3 way crossover could do.

Do the new Audio Control digital units have digital in? Has any one used them?

Phil
SCorpion
i dont know much about the PXA H700 but the PXA H701 has 8 channels of crossovers so u can run a fully 3 way front and sub.

and no significant noise issues that i am aware of. did u end up with some dodgy gear somewhere in the line?

im not 100% sure but if a HU can control the 701 i think (not 100% sure on this) that the same HU can control the 700.
shiny_car
both the H700 and H701 offer 3-way xover setups + sub. so you can HP the tweeters, BP the mids/woofer, and LP the subs (there are BP on all channels, so you could BP the tweets too if you wanted to...err. and use a subsonic). no probs.

'noise' is not an issue i've had to contend with before with alpine products to the point of being 'unacceptable'. you are either very fussy - which is very reasonable and we all try to be tongue.gif - the amps could be at fault, or indeed the 'source' combo is not up to scratch.

the PXA-H900 - if you can get one - is not leaps and bounds ahead, but is better. plus offers superior tuning including 11-channel output.

also consider changing the 'multimedia station' to a dedicated SQ HU instead, and adding a standalone screen, or just using the MS as a slave screen.

smile.gif
SCorpion
^^^wat he said

i sort of planned on having a seperate DVD HU and screen but the pioneer DSP just plain bites.
jas
the pxa-h701 or the h700 will do everything you need with the points you want

front 1 = tweeters
front 2 = bandpass mids
rear = bandpass midbass
sub = bandpass subbass (yes you can have subsonic filter)
SirNemesis0
I have noticed some noise from my system. I get a hiss at high volumes when the recorded volume is low. Don't know if its the recordings, or some of my equipment though.
DD Phil
QUOTE (jas @ Nov 2 2005, 11:51 AM)
the pxa-h701 or the h700 will do everything you need with the points you want

front 1 = tweeters
front 2 = bandpass mids
rear = bandpass midbass
sub = bandpass subbass (yes you can have subsonic filter)
*


But then you have no rear output........

Also the noise is anacceptable, at any volume above 15 there is audible hiss.

Phil
Blackrazor
DVD headunit of your choice, hooked into an Altomobile UCS Pro biggrin.gif (or 3... hell for the price of the F1 processor you could have one per driver lol)

http://www.altomobile.com/html/ucs_pro.html





All entirely processor controlled so you can assign whatever outputs you want to whatever you feel like running off them, theres no hard wiring biggrin.gif
DD Phil
DD have something similar in the works, does that one have digital in?

Phil
Blackrazor
Nope, only Analogue. The only ones i know of that do similar but with digital ins are the AudioControl DEQX (when its actually available), the new Zapco processor who's name i momentarily forget, and some pro audio gear like Lake processors etc smile.gif

The advantage of the UCS Pro (or its smaller brother the Drive 30) is the simple fact it costs less than 20% of what most comparable units do... and the other 80% will buy you one stonker of a set of front speakers wink.gif
jas
QUOTE (DD Phil @ Nov 2 2005, 06:07 AM)
But then you have no rear output........

Also the noise is anacceptable, at any volume above 15 there is audible hiss.

Phil
*


maybe thats why the h701 is the updated version

no hiss at all, then again hiss problems ive had have all been due to amps not headunits or processors.

you want surround sound processing and fully active

hmmm

pxa-h900 is the only unit ive seen
DD Phil
QUOTE (jas @ Nov 3 2005, 08:39 AM)
maybe thats why the h701 is the updated version

no hiss at all, then again hiss problems ive had have all been due to amps not headunits or processors.

you want surround sound processing and fully active

hmmm

pxa-h900 is the only unit ive seen
*


The hiss rises and falls with the PXA 700 volume, it doesn't change with head unit volume setting.

The car has 350Wrms per side for tweeters, so any noise becomes a big noise.

Phil
shiny_car
i don't understand that last post. why are you changing the volume with the H700, and not through the alpine DVD screen? they are connected via the Ai-NET cable right? and fibreoptic connection? what model DVD screen is it?

QUOTE (DD Phil @ Nov 2 2005, 05:07 PM)
But then you have no rear output........


you made no mention of rears in the intial post. tongue.gif

QUOTE
Also the noise is anacceptable, at any volume above 15 there is audible hiss.
*


why is it you're listening to 'nothing' at high volume settings - like 0-bit tracks? :huh: or maybe it's 'between music tracks' that it's apparent?

when you're playing music with 350WRMS, surely you can't hear the hiss then!

but indeed, you may be pushing the limits of the processor.

for the record *just went to garage and back*: my setup - including H900 processor - has a very low noisefloor. playing a 0-bit track, there is a very faint hiss when i put my ears within ~30cm of the speakers. this does not change with volume settings, which to me suggests it's inherent in the amps. so i would say that the H900 has a lower noisefloor than my (audison VRx) amps, and probably verges on negligible.

smile.gif
SCorpion
if u want fully active and 5.1 u will need F1 man. coz thats alot of active xovers.

otherwise just bandpass ur fronts wen running 5.1 and run full active fronts wen playin in stereo.

if u r using the digital in (not sure whether 700 has it) then u wont be able to us Ainet so u will have to change it via the 700. personally i cant hear much of a difference between digital and Ainet. thats on a fairly reasonable system.
Brucee
my h700 never have any hiss noise at all, but my friend using 701 with denon hu, have hiss noise, then again u using alpine hu with ainet n optical, doesn't make sense why occur hiss noise
jas
QUOTE (DD Phil @ Nov 2 2005, 11:52 PM)
The hiss rises and falls with the PXA 700 volume, it doesn't change with head unit volume setting.

*


so by that statement i assume you are using the analogue input, that might be the problem
>WAYCON<
QUOTE (Blackrazor @ Nov 2 2005, 04:45 PM)
The advantage of the UCS Pro (or its smaller brother the Drive 30) is the simple fact it costs less than 20% of what most comparable units do... and the other 80% will buy you one stonker of a set of front speakers wink.gif
*

How much for one of these BR? PM if need be.
foxey
I asked the same thing WAYCON.

He doesn't actually sell them, and the distributer doesn't bring them into the country anymore.

Only option is to import one, and even then trying to find one doesn't seem to be easy.
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