I'm rying to design a low tuned box for two of these SPL brutes, to fit in a car(!):
http://www.gz-usa.com/subwoofers/31/...1256021130.pdf
I've 4.635cf gross space to play with, but am having a devil of a time getting an enclosure
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
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!
Any info/help much appreciated
http://www.gz-usa.com/subwoofers/31/...1256021130.pdf
I've 4.635cf gross space to play with, but am having a devil of a time getting an enclosure
An externally hosted image should be here but it was not working when we last tested it.
to play low and not have port noise An externally hosted image should be here but it was not working when we last tested it.
/have a port that fits in the box. At present the customer has one sub and a 4000wrms amp An externally hosted image should be here but it was not working when we last tested it.
, 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
An externally hosted image should be here but it was not working when we last tested it.
The "recommended" enclosure for these is 1.75cf gross volume
An externally hosted image should be here but it was not working when we last tested it.
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!
Any info/help much appreciated
An externally hosted image should be here but it was not working when we last tested it.
Calculated Vs spec'd eff. implies very high inductance, hence the high tuning to get a ~flat response initially, so all things considered; building the largest sealed cab that will fit and EQing it to suit seems the only reasonable option.
GM
GM
Bose has a patent on using an exponential flare on the entry and exit of a port to reduce port air noise.
Hi,
When you put the T/S parameters into Hornresp it sure looks like those are not the correct parameters. On the ground-zero-audio.com site the recommended box is: "80 Liter/2.82cu.ft. - Rohr/Tube 1 x Dia. 16cm/6.3" - L=25cm/10" ", and it also says: Box recommendation sealed not recommended. If the parameters were correct a tapped horn (with quite bumpy response) would work in the volume you have available, but until you get actual T/S parameters GM's recommendation in Post #2 is the best way to go.
Regards,
When you put the T/S parameters into Hornresp it sure looks like those are not the correct parameters. On the ground-zero-audio.com site the recommended box is: "80 Liter/2.82cu.ft. - Rohr/Tube 1 x Dia. 16cm/6.3" - L=25cm/10" ", and it also says: Box recommendation sealed not recommended. If the parameters were correct a tapped horn (with quite bumpy response) would work in the volume you have available, but until you get actual T/S parameters GM's recommendation in Post #2 is the best way to go.
Regards,
Alas, those are the only spec's they provide🙁
I'll model the recommended enlosure on the sub page-they recommend smaller in the manual.
Oliver-big ask coming-could you do a rough outline of a tapped horn that might work? As you know I'm still trying to keep my head above water with HR!
I'll model the recommended enlosure on the sub page-they recommend smaller in the manual.
Oliver-big ask coming-could you do a rough outline of a tapped horn that might work? As you know I'm still trying to keep my head above water with HR!
Just spoke to the customer, going to stick with one driver and 4000wrms of amplification-should make things a little easier-any suggestions still welcome🙂
Right, just remembered GZ do passive radiators-so looking at going that route instead-slight problem though, GZ do not supply the Qms or RMS of their PRs, just Fs, MMS, VAS and SD and BBpro needs Qms and RMS-any way of deriving these from the supplied spec?
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