Speaker Asylum

Aging NHT 1259 parameter shift

71.53.31.20

altecboy

I have a pair of NHT 1259 subwoofers that had sat around for some time. When I retested them before installing in a new system, if found that the T/S parameters don't match those specified.

my qts is 0.66 vs. the spec 0.445
my vas is 5.4 vs. the spec 8.4
my fs is 24 vs. the spec 16.5

I used a DATS2 speaker measuring system.

Is my spider getting stiffer over time and maybe it's time for some new drivers?

Any input appreciated.

Follow Ups:

not surprising - Mr. Dick Hertz 07:42:16 07/06/16 (1)
In order to get the most accurate T/S parameters for the 1259's, I'd give them a few days break in to "wake up" after their long slumber. Then re-test.

There is no beer in food, but there is food in beer.
- RE: not surprising - altecboy 12:32:22 07/06/16 (0)
  I'll give it a try. Thanks for the suggestion.

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