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GRS 12PF-8 12" Paper Cone Foam Surround Woofer
This speaker + Grs 8 paper cone in "woofer" air space 2.1 cu ft ?
I found these great cabinets this weekend at a yard sale.Drivers were bad. wanted to use this  12" which I already have 6 of and the  grs-8 paper cone which I own 2 of, in the same air space wired in parallel with the dayton 3way crossover set to 4ohms.question is my internal volume of the entire cabinet is 2.9 cu. ft. and the space after bracing and enclosing the "woofer"area is 2.079cu. ft. is that enough space for this 12" and it's little brother the 8" together for the low end? Thank you.
Unfortunately you never want to mix two different woofer sizes in the same airspace. There is no way to properly model this and the smaller of the two will always be fighting the pressure of the larger, plus there is no benefit in the long run anyway.
Date published: 2013-09-25
Is it possible to get a full set of thiele-small parameters for this driver? I am specifically looking for Bl and Sd figures.
Unfortunately the manufacturer does not specify what these figures are. However, my modeling program gives me an Sd of 494.6 sq cm and a BL factor of 6.197 Tm. These are based on the rest of the parameters and calculated via BassBox.
Date published: 2013-06-20
Specs say 11.69" cutout diameter & 12" overall diameter. I don't see how this could be correct. What's the true cutout dimension?
Yes the cutout listed online is incorrect, the actual cutout for this woofer is 11.0625"
Date published: 2013-03-02
can you put the grs 12'' with the grs 8'' and the Goldwood GT-510 tweeter in the same sealed box
I was wondering if you could put the GRS 12PF-8, GRS 8PF-8, and the Goldwood GT-510 tweeter in the same sealed box with an internal volume of 3.295 cubic feet and the sound not be distorted at all.
Tweeters and most mids have sealed backs. Drivers that have open backs need to have their own chamber - volume designed to match their specs. So no, you can't put the 12 and the 8 in the same air space. Each air space needs to be determined by taking the specs and using an online speaker box calculator.
Date published: 2012-09-28
can i put this 12 inch sub in a 1.38 cubic feet sealed box and it still sound nice??
You need to take the specs (theile-smalle parameters) and plug them into an "online box calculator". It will then tell you the volume and tuning for a ported enclosure. You'll see response curves and the 3db down point for bass response. You will also see the same for a sealed box. Specify a total Qts of .707 for the most accurate bass. I can't use the adjective "nice" - but can say that if you use this method - that you will get optimum performance from this driver.
Date published: 2012-09-28
I plan on using this in a ported alignment under a bed for moderator listening and mostly sounds FX.I understand this device works better with a sealed enclosure about 3.0 cu.ft., but is there any smaller configuration possible? This would include porting and sealed boxes.
This woofer is really only meant for larger sealed boxes, the recommend vented box volume is almost 70 cubic feet. You can undersize a sealed box quite a bit but the problem you will run into with this woofer is the excursion. It might play low but only at very low listening levels. It will function in a box as small as 1 cubic foot but will be limited with output with anything below 40 Hz.
Date published: 2012-08-30
What is the diameter between mounting holes? Thank you.
The most important measurement is the cutout diameter. If the mounting holes don't line up, it's no big deal. You can always drill new holes.
Date published: 2012-01-19
Internal Cabinet Size?
what size cabinet would these need if they are inside a sealed cabinet? Also what cross-over frequency should you use when paired with a GRS 8PF-8 and Dayton Audio DC28F-8?
this woofer would need aprox 3 cu.ft. then you also would have to account for the air space the 8 needs. personally i would suggest the grs 6 1/2, but if you want to use the 8, then you will need even more airspace. you would be looking at 3.5-3.85 easy, and maybe more. these sound like the makings of a good pair of tower speakers. i would suggest the crossover here at part number 260-152. it seems to fit the bill. this would also work with the 6.5 grs if you reconsider. hope this helps you in your quest to low cost hi fi.
Date published: 2011-10-18