I did some measuring today with help from my son. He has an oscilloscope, so we could measure the soundcard's output and the amplifier output. We tried several test tones generated by Audacity: 15, 20, 30, 35, 40, 45, 50 and 100 Hz. The output of the RealTek soundcard looks very well at all frequencies: a perfect sine wave,
but the volume is slightly higher at low frequencies (only a bit, but not what I expected). Edit: see my previous post, the equalizer was still on when we did this test, that's why the volume went up a bit at the lower frequencies. No problems here.
My old Pioneer VSX-409RDS 5 channel surround amplifier handles all frequencies also very well (to my surprise): only 15 Hz is a bit lower in volume. The sine wave is perfect at all frequencies. Good old amp!
We could only do audible (or 'feelable'
![Tongue :P :P](/wp-content/themes/gtp16/images/smilies/tongue.svg?v=3)
) tests on my Sinus Live Bass Pump III bass shakers of course. The shaker handles frequencies as low as 45 Hz without problems, but you can hear a volume drop at 40 Hz, with 35 Hz at about half volume. It is almost silent at 30 Hz and nothing left at 25 Hz. The shakers are rated 20 - 80 Hz, so Sinus Live is very optimistic about their product
![Guilty :guilty: :guilty:](/wp-content/themes/gtp16/images/smilies/guilty.svg)
. It's not the amp, that's for sure.
Using the RealTek equalizer I have set the 31 Hz boost to 12 db (max), now 30 Hz can still be felt at about half volume. At 25 Hz nothing is felt anymore. FYI: the 31 Hz boost does not boost 45 Hz, so that's good.
My amp can handle the 12 db boost: no distortion seen on the scope, a perfect sine wave.
Even though the frequency response of my Sinus Live shakers is a bit disappointing I must say I'm a happy SimVibe user. The Sinus Live shakers are suitable for SimVibe. It's such a great addition for sim racing!
Is anybody willing to test their
<insert brand and model here> shakers? A subjective audible test using Audacity is enough (not everybody has a scope...). I'm curious what the real (felt) frequency response is of your shakers.