1995 A6Q- Bose Speaker Problems

[Ameer Antar]

I think Crutchfield should be able to help you out w/ the adapter. Maybe not, but if they don't have it I doubt anyone else will. 

About how to interface w/ the system, I know from experience from another Bose system on a GM car, they use amps on each driver in the speaker system. That means one for the tweeter and one for the woofer, etc. The reason for doing this is that you get less phase distortion if the signal frequencies are separated (filtered) before being amplified. Most simpler speaker designs just take one input from the amp and have an internal crossover to divide the proper frequency range amongst the drivers in the speaker, which is after the amp. The problem w/ that is the electrical components used in these passive crossovers affect the phase reponse of the drivers due to the relatively large values needed. That's why active crossovers are much better and are found in high-end bi-amped systems. They call it active b/c you need power for splitting the frequencies before the signal enters the amp(s). Passive crossovers don't need any power b/c they affect the actual RLC model of the driver. Active crossovers are more expensive not only b/c of the hardware itself, but also b/c you need a separate amp channel for each driver. If you want to maintain the sound quality (probly increase even), then you'll need to buy an amp or two w/ enough channels for each driver, and you'll need an active crossover before the amp to prevent damage to the drivers. Some fancy amps come w/ crossovers, but most are not flexible enough to provide a cutoff for a 2-way full range system. Most pro audio places recommend using an outboard crossover which allows you to have total control over what frequencies get passed along to each driver. If you want more info on active vs. passive crossovers, just search on google for "active vs. passive crossovers". I've never seen a Bose system on an A6, so I can't be sure of the exact design, but this is what I've seen Bose use in the past. Hope this is of some help.

-Ameer

---Original Message---
Date: Wed, 3 Dec 2003 13:53:49 -0800 (PST)
From: Steve Meyer <quattroslm at yahoo.com>
Subject: Re: 1995 A6Q- Bose Speaker Problems
To: Ti Kan <ti at amb.org>
Cc: quattro at audifans.com
Message-ID: <20031203215349.35410.qmail at web21409.mail.yahoo.com>
Content-Type: text/plain; charset=us-ascii


Thanks for your help! I believe that the speakers have
individual amps on each speaker. So, that leads me to
believe that any signal brought to each speaker is
amped, regardless if the aftermarket head unit is
already amplifying the signal. I thought at one point
I had heard that there was some sort of converter that
would allow aftermarket units to work with Bose
amplified speakers. Have you ever heard of such a
thing? It's been a while since I've looked into this
(off the list for 2 years), so I'm a little rusty. I
guess I know one of my projects for this weekend!

Thanks again!
slm

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