Si TM65 mkiii midbass - Page 2 - Car Audio | DiyMobileAudio.com | Car Stereo Forum

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Old 12-18-2018   #26
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Default Re: Si TM65 mkiii midbass

Makes sense - thanks.

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Pre-orders are normally at a discounted price, which are paid ahead of time. Essentially, you’re helping fund the considerable costs associated with buying a run of drivers. You’ll get a nice discount on the drivers but you won’t receive them for up to a few months.
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Old 12-19-2018   #27
 
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Default Re: Si TM65 mkiii midbass

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Wasn’t sure........ just curious about them. Seen the FS was 98hz on the Si site and was hoping someone had tried them out lol.
Will Fs likely change when it's mounted in a door? SI claims that these drivers have "clean bandwidth of 45 Hz to 10,000 Hz (in-vehicle)". How can that be if the FS is 98 Hz?
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Old 12-19-2018   #28
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Default Re: Si TM65 mkiii midbass

Fs isn't necessarily a limitation of extension. Fs is the point of excitation, however, a driver can play below especially depending on the acoustics of the environment. There's a few other calculations to see where the driver will naturally begin to roll-off and the point excursion begins to ramp up. Modeling helps some but the acoustics of the environment still comes into play.

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Old 12-19-2018   #29
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Default Re: Si TM65 mkiii midbass

What about thd concerns at and below fs?

2012 Subaru Impreza Sedan. Pioneer P880prs, Helix Dsp.2, JL 12w6v2 sealed, Arc KS1000.1, Modified Arc KS900.6, FI N.7 midbass, Illusion Audio C3cx. Ipod Classic - apple lossless. Just keep tryin' to get a little better.
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Old 12-19-2018   #30
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Default Re: Si TM65 mkiii midbass

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What about thd concerns at and below fs?
On paper and for upper frequency drivers, yes that's a concern. The amount of tolerable distortion in lower frequencies plus the fact that the sub still contributes in that area makes it not much of a concern. The SI isn't the only one with such a seemingly high Fs. Others have done well with such a design. Fs is just part of the the picture.

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Old 12-19-2018   #31
 
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Default Re: Si TM65 mkiii midbass

I just did some quick Googling, so correct me if I'm wrong, but it looks like Fs goes up with every generation of the TM65.

MKI: 57 Hz
MKII: 69 Hz
MKIII: 98 Hz
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Old 12-19-2018   #32
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Default Re: Si TM65 mkiii midbass

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Originally Posted by Tweezer View Post
I just did some quick Googling, so correct me if I'm wrong, but it looks like Fs goes up with every generation of the TM65.

MKI: 57 Hz
MKII: 69 Hz
MKIII: 98 Hz
That is correct....basically the design changes have improved the speakers ability to play cleaner at even higher midrange frequencies thus allowing it to be used as a midrange driver in a 2 way system. If being used as a dedicated mid BASS driver, there ireally s not much reason to swap to the mk3 unless you just GOTTA have the looks of carbon fiber cones.

In fact, I am still trying to decide whether to use dual Mk1 ported in the doors or dual Mk2 sealed in door pods in my next build. I have bought 4 of each, so I get to choose, but there is really no reason forum to even think about the mk3 iteration.

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Old 12-19-2018   #33
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Default Re: Si TM65 mkiii midbass

Not to compare, but as an example. Here's another popular mid with a higher Fs than stated lower frequency limit.


https://www.audiofrog.com/gs60-premi...e-loudspeaker/

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