RazMan
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 posted on 5/8/06 at 12:17 PM |
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Setting up my soundz
My middy has got sufficient room to mount a head unit and four speakers. I've installed component speakers (mid & tweeter) mounted in the
side pods and a pair of small subs either side of the service tunnel and behind the seats.
The stereo image is fairly good but I only need the front channels for clarity with the subs to provide a little extra oomph in the bass
department.
Question - As the subs will only need low frequency signals, is it ok to fit a low pass filter to them or is an amp required?
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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emsfactory
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| posted on 5/8/06 at 12:56 PM |
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Some head units can remove the high frequency signal to some channels, for subs.
It depends how hard you drive them if you need an amp or not. When I worked on stereos the headunit standard was 40 amps per channel. Enough to run a
small sub. 4/6 inch size but not too loud. If you want them loud you will probably need an amp.
What size are the subs you are using? If they are big then you will need an amp.
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RazMan
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| posted on 5/8/06 at 01:20 PM |
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Thanks for the reply - I'm not really interested in bass that make my ears bleed  I just want to reinforce it a little.
The subs I have are 5.25" units so quite tame by most standards. The head unit has a phono sub output for an amp but the firmware doesn't
allow switching the rear channels over to a dedicated sub like some do.
I was just wondering if the subs would work better if the high frequencies were filtered out on the rear channels.
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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graememk
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| posted on 5/8/06 at 01:36 PM |
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why not get a amp with cross over built in? so you have high mid and sub outputs from just one phono input ?
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David Jenkins
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| posted on 5/8/06 at 02:23 PM |
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Any form of sound system would be a waste of time and money in my little toy car - I wouldn't hear it over the wind and engine noise! (and I
prefer their noise, anyway)
David
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Danozeman
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| posted on 5/8/06 at 02:34 PM |
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A little amp may be your best choice. But as said some head units will play bass only through some channels. I know my sony does.
You can leter upgrade to a 15inch sub in the back and a dam great amp!
Dan
Built the purple peril!! Let the modifications begin!!
http://www.eastangliankitcars.co.uk
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emsfactory
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| posted on 5/8/06 at 02:48 PM |
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I was just wondering if the subs would work better if the high frequencies were filtered out on the rear channels.
Yes. they will work and sound better if you block the high frequencies. Also, if you have the space, putting them in a box will make them sound much
better. Unless they are free air speakers, but they aren't that good anyway.
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RazMan
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| posted on 5/8/06 at 07:35 PM |
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They are in a shared storage box with a hinged lid so the sound changes according to how much junk is stored in them (variable capacity acoustic
enclosure? )
Looking on ebay I can't find any low pass filters but I am sure they exist somewhere - any ideas? I guess I could use a passive crossover and
just leave the high frequency outputs disconnected?
[Edited on 5-8-06 by RazMan]
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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MkIndy7
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| posted on 5/8/06 at 09:17 PM |
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I've found this site to be very useful in explaining car audio components and terms.
http://www.bcae1.com/capspkr.htm
http://www.bcae1.com/passxovr.htm
It is quite technical but if you can understand it you might be able to make your own Crossover to filter out the ranges you require.
Failing that I'm pretty sure Maplins do a range of Audio Crossovers .
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RazMan
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| posted on 5/8/06 at 11:17 PM |
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Maplins to the rescue!
"Low Pass 12dB/Octave 100W Information:
A one-way crossover with a 12dB/octave filter curve Designed for using with high power subwoofers."
£4.99 - sorted
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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