Stereo Integrity TM65 MkII drivers...

CRiZO

Can you please explain why this is significant?

In calculating their peak diaphragm displacement volume (if I'm getting this right), the TM65 III is at 1258. I've been really happy with my 165's with a noticably lower 390. I just don't know what that means in application.

Is it basically having to move 3x less to hit the same frequencies? More efficient, meaning more volume out of the same power?

markesc

Well, I'm not a math whiz, but I after not having my car for 3 weeks then getting back in, I'm thinking there has to be room for improvement from the Hertz. I've had them for a year, but I just think there's additional room for improvement, however I cannot quantify the differences, but did notice the wild difference in xmax between the two brands which leads me to believe that the TM's must put out more bass / play louder.

I'll let Ron / others chime in on the technical part.

markesc

arrived!

TMIII's + M25's:

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RonRizz

It doesn't have to get technical. The watered down version is this...To make lower frequencies (bass) you need to move air. The higher the xmax, the more cone travel you have to move air.

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P99rs Head Unit--- Amps- 2 Pioneer Prs800d --- Zapco ST1000MX---Zapco ST-4XSQ---- SI BM mk5 Subs---SI TM65v2 Midbass--- SI M3 mids--- SI M25 xbl2 tweeters ----- 2016 MECA street class 3rd place at world finals