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Holy Crap! Sounds to make the sub go baaaaarf... (1 Viewer)

Geno

Supporting Actor
Joined
Oct 1, 2001
Messages
637
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did you get an SPL reading during that???
 

Seth_L

Screenwriter
Joined
Apr 5, 2002
Messages
1,553
No I didn't.

Edit: I just took one. It's about 92dB to the ratshack meter a few dB below reference. Your guess is as good as mine as to how far off the SPL meter is at 6Hz.
 

Lee-c

Supporting Actor
Joined
Sep 2, 2000
Messages
509
Add at least 25db to that figure for frequencies that low to give you an idea of the real SPL involved...

Wonder what the distortion is like with this sub at this extreme of performance?
 

JimPeitersen

Second Unit
Joined
Dec 7, 2001
Messages
470
These videos are great. I've got to get someone to host some shots I have of my BP 1803 (LT) during testing at 10 Hz and during the "Jurassic Lunch" segment of the Great Fantasy Adventure test CD. There is nothing like seeing an 18" driver moving over an inch each way!!!
JP
 

Eric Eash

Second Unit
Joined
Aug 3, 2003
Messages
367
is there anyone here that can host a video of my av15s if i send it to them. i have webspace, but have no idea how to use it.

eric
 

Justin Ward

Supporting Actor
Joined
Jun 6, 2002
Messages
673
I just fired up BHD to that part you guys were talking about. I didn't hear or feel much right off. Just for fun I used a mirror to watch the sub. I was watching at 6dB from reference with no infrasonic filter. The cone was just flapping, you could indeed count the cycles. amazingly it didn't bottom out though, despite being ported at 18hz.
 

Paul_Wright

Auditioning
Joined
Dec 6, 2003
Messages
10
I hadn't noticed the really-really low frequency in BHD, so I fired it up on my IBs (don't use a high-pass filter). Of course I couldn't hear it...it just modulated the room surfaces.

I'll offer a theory that it is the beat frequency of 2 helicopters running at slightly different speeds.
 

Eric Eash

Second Unit
Joined
Aug 3, 2003
Messages
367
i just caught (the act of marshalling in an aircraft or helicopter, assist in shutting it down, chocking it, grounding it, and other related tasks) 2 blackhawk helicopters over the weekend, and i think the bass in BHD is spot on. one thing i noticed when i launched them, as i was around 30ft away from the tips of the blades, the bass wasn't there during startup or idle, only when they changed the pitch of their blades to lift off the ground did the bass start thumping. i wish i could've got a ride, but they said with the wind we are getting here, that they couldn't have given me a proper ride anyway.

eric
 

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