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Old 04-03-2002, 20:30   #1 (permalink)
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Car Kits

Please kick my arse if this is too out of topic for this forum... it's more of a general car question then an EA one.

I've been in a few cars that have mobile phone car kits though actually output the phone through the car's internal stereo speakers, dimming the sound of any music currently being played.

The closest I've seen while shopping around myself are the car kits which include a mini speaker that plugs in to the cigarette lighter with a mic that can be placed on the A pillar (I think that's the proper name for the pillar anyway).

Does this sort of set up require a specific product or a special brand of stereo or amp?

Thanks,

James
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Old 04-03-2002, 20:55   #2 (permalink)
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The car kits that play through the car's speakers can be used with any headunit providing you are not running an amp. The way it works is that the kit is interfaced between the headunit speaker outputs and the speaker wires themselves....this involves cutting all the speaker wires. That's why you can't use it with an amp because the music signal is sent through RCA's. To be honest, these type of kits are shithouse. I don't know of anyone who makes them anymore. The old "Parrot" kits that we used to install had heaps of problems.

You'll find most PROPER hands-free kits (not the plug in cig-lighter one u talked about) come with a seperate speaker that is mounted under the dash somewhere. They also have a separate microphone that is placed on the A-pillar and a seperate module, phone cradle, antenna and power lead. Some of these kits can be interfaced with the radio so it plays though the speakers. Smartec kits have this feature but it is an option (they come with a seperate speaker normally). Personally, I wouldn't recommend running it though the car's speakers, you'll get too many feedback problems. It's much better just to use the seperate speaker. Hope this helps.
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Old 04-03-2002, 22:57   #3 (permalink)
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SPHELL....

ive been pretty blunt with a few people lately on this board, because i decided to stick my "come good" attitude because the board turned into some kind of performance enhancing forum where all the advise was from people who know nothing, ie it was just a big circus......anyway i have decided to reply to your comments...

the handsfree kits are not shithouse, and you can use them with an amp by all means....it saves turning the radio volume down when driving if a call comes through in busy traffic. If the music can be sent to an amp through an RCA, why cant the handsfree voice output be sent through an RCA ?.....it can, and they often have preamps on them to control the level of it :) ......also if you dont wish to use the amp, you can interface the kit with the speaker outputs of the amp, basically meaning it cuts off the speaker from the amp, and joins the speaker to the handsfree unit. quite easy to install.

and how in the world can a handsfree kit produce negative feedback?, it doesnt produce any radiation significant to FM or CDAF and certainly doesnt induce a ground loop.

just a suggestion.......state facts with a bit of knowledge.

ben
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Old 04-03-2002, 23:53   #4 (permalink)
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Just a question - does regular feedback become a problem with these kits? I'd imagine that if the person speaking to you is being outputed through your speakers, the mic in your car would pick that up and they'd hear their own voice (?) Is this the case? Or is there some mechanism in place to prevent this?

James
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Old 04-04-2002, 19:42   #5 (permalink)
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Dear Ben

Ben, I think you are the one that needs to read up on the installation of hands-free kits and what they can and can't do.

For a start, where in my post did I say the kit will produce negative feedback? The feedback I'm talking about is from the multiple speakers in the system feeding back into the microphone.....this is why it's preferable to use the single speaker that comes with the kits as you can mount it further away from the microphone to eliminate this problem. OzOrion was right on the money with his last post.

Secondly, please show me where I can get a hands-free kit with pre-amp (RCA) outputs and a input sensitivity control! I'm pretty sure they market this type of equipment as a line driver (with a built in hand-free module as a bonus!! woo hoo!)

Your comment on interfacing the kit with the speaker wires after the amp was fair....it can be done, however, lets say for example that as a minimum most popular 4ch amps are rated at 4X50WRMS. Now I'd hardly trust the reliability of that little switching box running 200WRMS+ though it when the kit is not engaged. Not to mention the degradation of sound quality....who knows what cheap and nasty components the music signal may be sent though on it's way though that box. That is why it is suggested that they only be used with headunits as even the most powerful models would be lucky to output 4X15WRMS....and any system only running a deck is obviously not going to be the sound quality system of the century so a loss of S/N ratio is not a great concern.

And where you say the kits "can be used with an amp by all means....it saves turning the radio volume down when driving if a call comes through in busy traffic" I think you are confusing this with radio mute....which is a handy feature most hands free kits have that does exaclty that....mutes the radio on incoming and outgoing calls.

So there are the facts Benny boy, coming from a guy that has fitted at least 7 hands-free kits a week in cars for the last 2.5 years.
Cya later.
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Old 04-04-2002, 21:14   #6 (permalink)
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Re: Dear Ben

the feedback you speak of is in phase feedback, or positive feedback, my bad. this is eliminated with gain settings and mic position.....they are no worse in some handsfrees than in others

pre-amp outs dont have to be RCA plugs, a "headphones" jack is exactly the same for instance

the switching box you refer to would be none other than a switch mode power mosfet, which is a mcuh higher quality device than used in car amplifiers anyway

i know what cheap and nasty signal would be sent through the box, whatever your amp puts out!, no other

hope this clears up any misunderstanding of what i said.....'

cheers

ben
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