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Any car audio gurus?

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b5l4ll
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2009/07/19 10:39:38 (permalink)

Any car audio gurus?

I have a nissan primera 2.0 with a stock headunit.
 
I've added to this, an Alpine 6 Disc Changer via a NISA1 M-bus interface (lets the headunit talk to the changer).
 
Everything works brilliantly. I've had a great improvement in sound quality from listening to CDs vs the radio. (The stock speakers are more than fine for mid and high range sound)
 
 
I've now purchased a "Vibe CBR10 Active" sub...
 
The amp supports both high and low level inputs. My stock headunit has no low level (pre-amp) output.
 
- THE PLAN -
 
1) Disconnect rear speakers
2) Feed Rear-Left and Rear-Right lines into high level input on the amplifier. 
 
................................................................
 
Do amplifiers with High Level Inputs convert the signal to low level prior to amplification? As to reduce potential distortion.
 
 
 
 
 
 
#1

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    JK2
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    Re:Any car audio gurus? 2009/07/19 10:43:50 (permalink)
    Is this to make the rear window of the car buzz loudly while you're driving by secondary schools?

    #2
    b5l4ll
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    Re:Any car audio gurus? 2009/07/19 10:50:32 (permalink)
    JohnKerr2

    Is this to make the rear window of the car buzz loudly while you're driving by secondary schools?


    No it's to cover the full range on frequencies while I listen to my music actually.
     
    Not enough to make anything buzz hence the 10" sub.
     
    Nice suggestion though but not the kind of thing I'm personally into.
     
     
     
     
    #3
    beef_pumper
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    Re:Any car audio gurus? 2009/07/19 11:15:56 (permalink)
    So to be clear, you want to run a sub and your rear speakers through the amp, or just the sub through the amp and the speakers through the headunit.
     
    What channel amplifier is it?
     
    Are the rear speakers stock?
     
    Also, sounds like you are gonna need a new headunit too.
    #4
    b5l4ll
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    Re:Any car audio gurus? 2009/07/19 11:29:30 (permalink)
    beef_pumper

    So to be clear, you want to run a sub and your rear speakers through the amp, or just the sub through the amp and the speakers through the headunit.
     
    What channel amplifier is it?
     
    Are the rear speakers stock?
     
    Also, sounds like you are gonna need a new headunit too.


    Hi mate,
     
    Thanks for your reply.
     
    It's an active sub so the amp is mounted to the enclosure. It's a mono channel amp so will only drive the sub.
     
    The amplifier will need an input (often taken from the back of new headunits as a PRE-AMP OUTPUT) If this isn't available, as is the case with stock headunits, some amplifiers have High-Level inputs. The idea is to tap off from the rear speakers (these are stock speakers) to provide the amp with this High Level input. I will be disconnecting the rear speakers altogether so this won't be a problem.
     
    The front door speakers are driven by the headunits built-in amp and are more than loud and clear enough.
     
    Sub driven by its own amp.
     
     
    I will eventually upgrade the headunit as I now intend to keep this car for a few more years, but for now this will do and it's at no additional cost (no extra adapters etc will be required to get this working)
     
     
     
     
    #5
    swordfish
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    Re:Any car audio gurus? 2009/07/19 12:34:30 (permalink)
    it will work off the rear speakers but will sound shocking.

    if its not for impressing school girls then you really dont need a sub to give you the full range of freq for music if you want it ballanced with your standard speakers. you could just seal the front door enclosures better to give your fronts some low end
    #6
    shane278
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    Re:Any car audio gurus? 2009/07/19 12:39:19 (permalink)
    This is a very helpful site for answers to questions like that.
    http://www.talkaudio.co.uk/vbb/index.php
    #7
    beef_pumper
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    Re:Any car audio gurus? 2009/07/19 13:30:20 (permalink)
    Yep, TA is a good site. ^^
    post edited by beef_pumper - 2009/07/19 13:31:40
    #8
    cu3ed
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    Re:Any car audio gurus? 2009/07/19 13:57:56 (permalink)
    DOnt know how thats gonna work TBH, how are the signals supposed to slip from a r/l channel for the Sub?
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    beef_pumper
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    Re:Any car audio gurus? 2009/07/19 14:02:29 (permalink)
    Yeah, I know it's not good for the source being the headunit to feed a sub like that, via the higher frequency r/l channels.  It can be done though i think.
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    b5l4ll
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    Re:Any car audio gurus? 2009/07/19 18:07:06 (permalink)
    cu3ed

    DOnt know how thats gonna work TBH, how are the signals supposed to slip from a r/l channel for the Sub?


    New amplifiers are built to accomodate this.
     
    They have both a low-level and a high-level input. The high-level is taken from the speakers (front or back). Ideally low-level is preferred as it's a "cleaner" signal. Aftermarket headunits have this built-in.
     
    It's possible to purchase devices designed to accept high-level speaker inputs, filter and clean the signal, then throw out low-level via RCA terminals. I have one of these which I'll be using with my stock headunit.
     
    Will be installing on the 24th this month. If anyone's interested, I'll upload some pictures of progress and when it's complete.
     
     
    #11
    cu3ed
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    Re:Any car audio gurus? 2009/07/19 18:15:38 (permalink)
    Yes, I have an Amp sub in my car, but I suppose I had the Amp out cables, so cant figure out how the Amp is supposed to in a quality sence split the sound from the same srouce as the speakers.
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    b5l4ll
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    Re:Any car audio gurus? 2009/07/19 18:23:10 (permalink)
    cu3ed

    Yes, I have an Amp sub in my car, but I suppose I had the Amp out cables, so cant figure out how the Amp is supposed to in a quality sence split the sound from the same srouce as the speakers.


    The source won't be split. I can understand what you're saying... having the rear speakers working but at the same time tapping off them to supply input to my amp to drive the sub. This will most definitely cause performance issues however, when using devices such as http://www.dvbcaraudio.co.uk/hifonics-addasub-hightolow-level-converter-p-5778.html this problem is eliminated.
     
    I was planning on disconnecting the rear speakers altogether and feeding their supply directly to the amp. This is no longer necessary because of the high-to-low converter.
     
    The front coax speakers I'll soon be replacing with components... Then eventually I'll have a new Alpine headunit installed.
     
     
    #13
    cu3ed
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    Re:Any car audio gurus? 2009/07/19 18:27:48 (permalink)
    Well you dont use rear speakers, period, you dont listen to speakers at home with your back to them, good fronts and teh Sub is all you should need.

    But dont know really anything about those other devises TBH, would it nut just be btter to save the money and get a HU with an AMP out?
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    b5l4ll
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    Re:Any car audio gurus? 2009/07/19 18:35:48 (permalink)
    cu3ed

    Well you dont use rear speakers, period, you dont listen to speakers at home with your back to them, good fronts and teh Sub is all you should need.

    But dont know really anything about those other devises TBH, would it nut just be btter to save the money and get a HU with an AMP out?


    I'm in a position to purchase the headunit now if I wanted but I'd like to maintain the stock headunit unless this setup turns out to be no good.
     
    I'll have the left and right rear cables into this converter then from there take the RCA out to the RCA in on the amp. Providing the converter does a nice job of filtering, I should be happy with the result.
    #15
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