rx7duck

Car: '89 vert.

I've read through a lot of the radio threads but still have a few points requiring clarification:

1) Speed compensating volume(i.e. faster=louder, slower=lower): I'm looking at a Blaupunkt deck that has this feature and think it would be great for a vert. Anyone here ever hooked this up in an RX7? If so, how?


2) Speakers: I plan to rip out the factory speaks and amps in the front, rewire and hook up the front/rear speaker leads to new underdash/door speakers respectively. Then take the pre-amp signal from the headunit and put that into the headrest speaker amp. I covered the subwoofer in another thread.

a)Will the pre-amp signals vary with head unit volume so that my headrest speaker volume will be controlled by the head unit volume? (This is probably a dumb question but it's been a few years since I've played with car stereos.)

b) Does this sound like a logical speaker scheme?


3) Power Antenna: Thanks for posting the relay diagram - got this one covered.


4) Best mounting kit: From what I can tell from looking around, there are two: Metra Mazda S&E Rack and American International "Universal" w/ pocket. It looks like with either I'll end up with a nice new pocket in which to keep my crack pipe and pocket version New Testament.

Which gives the best looking finshed product? I've got a mototool so I can tweak either, I'm most concerned with having a good looking end product. Anyone out there tried both?

vectorminds

1) its a great idea, im looking to try to hack that into my system... but if the deck already supports it the install should be no diff than how they say to hook it up in the manual

2) (im guessing you are getting an amp for the front speakers?)

a) i belive the headrest speakers use high level inputs, so that would be a yes (but look at the wireing diagrams to make sure)

b) thats similar to what i did, cept since i had separates i put the tweeters in the door between the handle and the vent

3) radio... whats radio

4) made my own... cant help ya there

Icemark

for #4
If you have the desire and ability, use the stock brackets rather than any kit, and build a trim ring.

Don't use the kits, it will always look after market and non-factory

rx7duck

That's the problem, they tell you which wire it is and that's it. They give absolutely no indation of how or where to hook it up. I emailed Blaupunkt tech support but have yet to hear back from them. If and when I ever figure out how to get it hooked up, I'll report back to the forum.

Icemark

its normally a function inside the head unit

rx7duck

Im not sure I understand your post - are you saying there's something in the head unit (based on inertia or noise level or whatever) that does it automatically? If so, why do they have a wire coming out of the head unit for it and where does it connect?

I'm not saying you're wrong, I'm just trying to understand this thing and how it works.

Icemark

There is a mic in or attached to the head unit and a processor in the unit that reads all noise and subtracts anything coming out of the stereo effectively monitoring the ambient noise in the car (usually though on a A weighted dB scale).

So the head unit monitors the outside sound and adjust accordingly.

Blaupunkt has been using this technology since the early 80's. It is nothing new.

Matt22

iTrader: (10)

Thats funny

rx7duck

Hmmm...interesting. I'd looked all through their US site which had no direct mention of it. Your post piqued my curiosity so I went to the UK site just to see if they might have something about it there. Guess what?

" A Blaupunkt innovation: DNC

Pure, unadulterated sound
While the vehicle is in motion, a signal processor uses a microphone to measure and analyse the driving noise (interference signal) that covers the music reproduction (desired signal) in the bass frequency range in particular. This problem is compensated by specifically boosting the audio signal in the corresponding frequency range.
As a result, DNC keeps the sound and the volume at a constant level, independent of the driving speed and road conditions: driving noise covering that would not be possible with conventional, wideband volume control."

Of course, in the US, they call it something different as well, either Autosound or GALA. And I still don't understand why there's a lead coming out of the head unit for it if it's already built into the head unit. Oh well....

Thanks for the explanation - you're right on the money.

Icemark

yeah it was a feature on some of the decks back in the mid eighties, and standard on some of the old early 80's L7/735 BMWs.

rx7duck

Heard back from the Blaupunkt tech support email guys:

"That lead goes to the VEhicle Speed Sensor of the vehicle."

I guess the unit doesn't have it built in as discussed in earlier posts to this thread. It looks like I'll have to hook it up to G/R lead behind the instrument cluster. (According to my reading of the Haynes wiring diagrams and a wiring diagram I found posted in this forum.)

This is the speed sensor lead which is used for cruise control, power steering and AT.

Before I rip apart my dash (PITA), is this as straightforward as it sounds to get to and identify this wire?

(aside from the incredibly short wires behind the guages - I guess making them two inches longer would have added too much weight )

Icemark

easy to get to the speed sensor wire at the power steering computer right behind the drivers dash speaker.

You should not have to even disassemble anything to get to it.