PSN-L Email List Message

Subject: Subwoofer to reproduce sine waves at low frequencies?
From: "Tiago A." tiagoagre@.........
Date: Mon, 22 Jul 2013 01:08:39 +0000


After searching a bit about subwoofers at low frequencies, i put the
cheapest subwoofer i have (90mm) near (2/3mm) from a L15B 4.5Hz
horizontal geophone. Using a sine wave tone, it recorded very well at
10Hz, <10Hz was a bit tricky but managed to get good results.

Then i tried at 10s, at first i was only getting a very weak noise at
5s from the subwoofer (supposedly its a subwoofer noise when moving
up/down at the top of the sine wave), but after many settings i
managed to get the subwoofer making a strong "blowing" noise at 5s
period, i could hear clearly a sine wave at 5s (i know the sound is at
much higher frequencies).

This is the recording of the 5s period on a 4.5Hz horizontal geophone:

Its a good reproduced 5s sine wave?

Best Regards,

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