In Reply to: RE: we shall see... posted by hennfarm on July 2, 2014 at 21:10:08:
I ran the TS parameters in LIMP again with a 90 gram added mass.That was right in the middle range of what the program said was the ideal phase shift between the added mass and non added mass measurements.
WinISD said a 3.75 cu. ft. closed box would be an ideal enclosure.
Since that was the size of the box I had, I installed the 55-1220 and let it run full range in the closed box.
I threw a Magnavox horn on top of the box crossed over at 2K cycles first order with L-PAD.
The WinISD plot had the low end rolling off at 100Hz, so there was no deep bass when I listened to it.
Edit: got up this morning and ported the box. It is tuned to 38Hz.
Took a Hz sweep in room.
The horns have a bump in their response.
I might try to work on a notch filter, but it is not critical.
The low end down from 1KHz was better with the 55-1220 compared to the Olsen 12" woofer I had in the box previously.
Edits: 07/03/14
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Follow Ups
- RE: we shall see... - deathtube 667 22:46:40 07/02/14 (0)