I'd like to convert my CHT CS18.2 (dual 18") to two vented subs.
This would be the first time I model/build a subwoofer. I'd like to hear your opinion about the the idea in general and, most importantly, if this kind of project should even be considered by a noob like me.
The drivers are Eminence OEM used in all current Chase Home Theater subs, both sealed and vented.
Their vented one, VS18.1, did well in recent data-bass benchmarks
, so it is known that the driver can deliver in a 7-8cu.ft box tuned to 19Hz or so.
I have room for bigger subs behind the screen. they can realistically be up-to 17 cu.ft volume (30x20x50). I am curious if going LLT maybe a better option in my case.
UPDATE: the models below are based on overstated Sd numbers. For models based on more realistic assumptions see https://www.avsforum.com/t/1445228/using-cht-18-drivers-for-llt-type-subs-bad-idea#post_22702909
Here is how 7 cu.ft. @ 19Hz vs 17cu.ft. @ 14Hz tune boxes model with 300W signal. both have HPF just below tuning frequency.
the same boxes and power, no HPF on the LLT version
The specs for the drivers are not listed but they were measured by user LilGator.
Re: 6.963 Ohms
Fs: 21.53 Hz
Le: 3.461 mH
Mms: 369.4 g
Vas: 19.78 Cu Ft
SPL: 93.86 1W/1m
BL: 31.31 N/A
Cms: 0.15 mm/N
Sd: 0.1642 m^2 more likely 0.1140 m^2
from the CHT site:
Xmax: 0.75in (edited. originally had it at 1.5 for peak to peak,did not realize i had to divide it by two)
what do you guys think?