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Old 09-12-2011, 10:43 PM
deafwish deafwish is offline
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Location: Melbourne, Australia
Join Date: Sep 2011
Posts: 34
Mein Auto: E83 X3 3.0d M Sport
Originally Posted by Evlengr View Post
When you replace door speakers it's like replacing tires. Make sure you do them all and they match. this is so they match electrically, and will put an equal load on the amplfier.

Also, I respectfully disagree that mounting co-axial type speakers (underneath the seats) will give you an added benefit over the mid bass subs. Bass frequencies are non-directional so where you mount them is not critical. Once you move up the audio spectrum to higher frequencies placement can be very important.
In fear of looking like I'm trying to prove you wrong - your above statements are not entirely true.
All the factors in having ideal sound reproduction in a car is to generate the imaging & complete sound spectrum of a live recording/ event.
Putting the same speakers in the back of your car as the front will give you too strong a 'rear stage'.
When was the last time you went to see a concert/ band or even orchestra & had the sound coming from behind you?!
A strong front stage is paramount in any audio build - regardless of the environment it is installed in (home, live, car etc).
Rear speakers are called 'rear fill' & they are designed for exactly that.
In just about every install I do, I either dis-connect the rear speakers or leave the stock ones connected - but faded out.
In a perfect world, you want the rear speakers to only be audible by the rear passengers.

You are correct in that bass frequencies (<100Hz) are non-directional.
The sound emitted from the under seat mid bass is NOT subsonic - as it is not a sub woofer.
Mid Bass speakers are designed to reproduce frequency ranges of between approx 100Hz & 250Hz and those frequencies are directional.
Mid range speakers (like our door mounted 4" drivers) typically reproduce frequencies around 300Hz to 3.5KHz and is even more directional.
Tweeters are the most directional frequency and have a dramatic effect on imaging in a car.
Go have a listen to a passive 3 way system and cover the mid bass with cardboard. You will instantly know what I'm talking about!


Last edited by deafwish; 09-12-2011 at 10:45 PM.
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