Interesting RTA tuning question... - Chevy Impala SS Forum
 
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post #1 of 7 (permalink) Old 05-18-2002, 08:55 PM
sinsstr
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Well, I think the system I am going to finally end up with will consist of components in the doors, 6x9's in the rear deck, and two AURA Bass Shakers mounted under the rear seat. (for anyone unfamiliar, bass shakers are transducers that actually vibrate the surface they are mounted to, not speakers).

So my question is this: Since the bass transducers are really only felt, not heard, will I see their "frequency" reproduced on the RTA, or should I tune assuming there is really more percieved low-frequency information than is showing on the display?

The question is really moot anyway since I usually tune by ear (butt), I really just use the RTA to find trouble spots. I haven't tried any of this yet, the qustion just struck me as curious because of the way transducers work and the fact that an RTA works off of a microphone. Since subs are actually moving air, a microphone will pick up their frequency and register it on the RTA, but a transducer is just vibrating body panels so it may not necessarily be "heard" by the RTA's microphone.

Any thoughts?
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post #2 of 7 (permalink) Old 05-20-2002, 06:06 AM
gbelli
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The vibration will indeed produce a sound wav. What Freq, etc I have NO idea. It'd definatly be interesting to hear what you come up with though!
post #3 of 7 (permalink) Old 05-20-2002, 06:21 AM
SS964mo
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I wish I had an RTA
 
post #4 of 7 (permalink) Old 05-20-2002, 12:23 PM
sinsstr
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Should be interesting when I get it all hooked up.

We do a lot of audio playback at work, so I have a couple of RTA's to choose from.
post #5 of 7 (permalink) Old 05-20-2002, 01:03 PM
Sinij kot
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You should take a look at the specs of your microphone. I belive most microphones will not pick up very low frequencies, meaning they will be attenuated. Just look at the frequency response curve of your mic.
Btw, which RTA you are using, and what mic ?
I will be doing the software-based RTA as my senior project for EE this summer.
Another thing to keep in mind. Are you really interested in the low frequencies below 20Hz ? since you can't here it. I know the SPL competitors concentrate on them since there is a lot of power generated at that end, but for SQ it is better to filter out those frequencies in order to use power where it needs to be used. This is the reason why many EQs and EQTs have build in subsonic filter.
How are those shakers anyway ? I never had any experience with them.
post #6 of 7 (permalink) Old 05-20-2002, 02:18 PM
camel
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i don't think the bass shakers produce anything below 30 hz and i think they go to about 60 or 80. most spl teams tune there boxes to 55-60 hz because that range gets te loudest i beleive.
post #7 of 7 (permalink) Old 05-20-2002, 02:36 PM
jelzey
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Camel you are correct and the bass shakers will effect the RTA since it does effect the cabin air pressure. It forces the speakers to move less air in the cabin and the effect varies due to the shaker placement and how big the cabin is.
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