Qts and VAS for monacor sp-300pa

[fire]

I need qts and VAS parametar for monacor sp-300pa (12in) . I only know fs=40Hz.

[kelticwizard]

Well, I can give you a good guess on the Qts, but not the Vas.

If you look here from the Monacor website, you will see that at Fs, the SPL is about 85 dB. that is about 8 dB les than the rated midband of 93 dB, therefore the Qts is about 0.4, more or less.

My guess the Vas is somewhere around 4 cubic feet, (113 liters), but don't hold me to it.

My personal guess is to stick into a 3 cu ft, (85 liter), box tuned to 50 Hz, (4 inch diameter or 100 mm) and 1.5 inches long (38mm).

Or you can lengthen the port to tune to 40 Hz-that would require a port 100 mm diameter by 100 mm long.

Then decide which sounds better.

You have a pretty good chance of being close to right.

[kelticwizard]

The other possiblity is to email Monacor from this page:
http://www.monacor.com/int/en/mail.html?spr=EN

Ask them for the Thiele-Small specs or, if they don't have them, for a recommended box size and tuning. I am sure they have some idea of what size and tuning of box would work well with the speaker.