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RE: we shall see...




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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  • RE: we shall see... - deathtube 667 22:46:40 07/02/14 (0)

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