I've 4.635cf gross space to play with, but am having a devil of a time getting an enclosure to play low and not have port noise/have a port that fits in the box. At present the customer has one sub and a 4000wrms amp, though he wants to add another sub and amp-so up to 8000wrms on tap.
With an 8x8" "slot port" I'm ending up with a port length of 40" and still getting port noise with 4000w, up it to 8000w and it will be whistling like Fred Astaire.
The guy wants this for street bass and I've recommended he goes for different subs, but having invested £600+ in this one he doesn't want to shift product
The "recommended" enclosure for these is 1.75cf gross volume with two 4" ID ports 9.84" long-but that will chuff off just under 300wrms according to BBpro-which to me says the box/vents are massively too small or GZ presume you'd only use this for SPL and not care about the extra noise from the port?
Am I wasting my time with attempts at a low tune?
Does anyone have any more TS spec for these? I have WT3, but the guy is a 4hr drive away and I don't paid enough for that drive!
Customer has relented a little-realises 2 subs is going to be near impossible, and have now got it modeled for the one sub-200mm x 200mm x 1m long port, gives 37Hz tuning.
you need 2.82cf and the port is 1xØ 6.3'' and 10'' long for one sub....this is the box i will made in a few days and i play it with one gzpa 1.6000d at 2ohm....
Merci pour la suggestion, mais mon client a besoin d'une plus faible Fb et la vérification de votre conception, il serait très hauts niveaux de bruit d'évent évidente du monde 300Wrms et la mise ne vous rencontrez ce?
Désolé pour mon français, 20 ans depuis que j'ai étudiés, il et un peu de Google translate-ce qui est probablement aussi mauvais que mon français!
Hello Greg....... from my mistake i wrote France but i am from Greece....I am sorry..nice french language but i dont understand word....only with the help of google translation...
if i understand correct you have a noise from the port ?? try to do it bigger then to stop the noise...
lol-how's your German or Italian? Perhaps a bit of Latin?
Ok, what I said was:
Thanks for the input, I've modeled the spec you gave me and it tunes too high for my customer and, according to BBpro, would start producing lots of port noise on as little as 300wrms. Do you have port noise? If so when does it become evident?
from what ive read over the last 20 years, most drivers are up to 20% off published specks, measuring the actual driver and building the box for those results is best.
Customer was mail order so wouldn't have been an option-I have WT3 so would have offered the service if he came in store and wanted me to (would have to take the driver home to measure, not an option on this POS pc!)
I've used WT3 to measure the spec on speakers and some have been miles off, claiming 90dB + sens and getting 86dB-cheap ass'd crap! Better brands have been closer to spec but always deviated a little.
Ground zero plutoniun gzpw12
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