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GRS 4PF-8 4" Paper Cone Foam Surround Woofer
Low pass filter needed?
Do I need a low pass filter for these if using them in a line array with Piezo tweeters?
You should use a 1.6 mh coil to filter these, at least that's what I did. Sounds good.
Date published: 2013-04-13
Recommended crossover frequency?
For a 1st order butterworth crossover, paired with the given tweeter, what would a good frequency be/what inductors and capacitors should I get?
The Butterworth slope is not feasible in a 1st order (6db/octave) network. it starts in the 12db/octave,Second order and up.See attached crossover drawing and assuming parts are all 8 ohms...round values to the nearest,,,, good luck
Date published: 2012-12-13
Help with calculating ported or sealed enclosure?
I'm attempting to build a cheap... ahem... inexpensive tv soundbar using these woofers. EBP is showing 51.58 which indicates this speaker is good for both ported or sealed enclosures, although it looks like it favors sealed. I've tried online speaker box calculators, but they show at least 6+ cubic feet (EACH - left and right channel) Vb for either designs. That seems just too big for a soundbar.I'm using a 50W x 2 to drive these (and their corresponding PE Buyout tweeter) so I'd like (if feasible) to lean toward a ported design so that I don't have to use all that power for lower volumes. But if a sealed design is the best way to go, well then I go with that. Any suggestions, experiences, or recommendations for a MUCH smaller design would be well appreciated. Thanks in advance!
Hi Pal,,,lol, funny stuff,, Dual 18" concert subs don't even use 6 cubic ft.Make sure you place those decibel points correctly and type in all numbers exactly!!!0.1 cubic ft. per driver is what i am showing,The internal cabinet volume measurements would be:H 6.00" x W 6.00" x D 6.00",,, 12" x 6" x 6" is 0.25 cubic ft and good for two drivers (with a tad extra space that cant hurt).Cut-off says 39hz, I feel its closer to 50hz !!!!..Be sure to line top back and side with dampening material found here at PE,,,, fiberglass insulation works in a pinch, but you'll itch a bit....Best of luckPS: Keep it sealed, use silicone on all internal seams (leaking air will compromises bass performance)
Date published: 2013-01-05
mounting in micro guitar amp
I have a 5 watt @8 ohm peavy amp .I was hoping to upgrade the speaker Do u think this would improve the sound? this speaker looks beefier than the one in the cabinet and better quality..could u send me mounting diagram or give me the dimension for hole center to center for the mounting screws thanks Toml
Hi Tom,,,This driver will work great for the dollar...Overall Outside Diameter is 4.125"Baffle Cutout Diameter is 3.75"Depth 2.125"screw positioning would be circle squared but I'd wait for driver before drilling...If i can suggest spending a little more for best output and better match with your Peavy's 5 watt amp,recommend theVisaton 9020 W100S 4" Woofer with Treated Paper Cone 4 Ohm.The advantages are:2db louder/ more efficient @ 86 db with 1 watt of power.its 4 ohm impedance will automatically allow the Peavy amp to double its power by producing 10 watts...Calculating and doing the math using both speakers parameter sensitivity @ 3.3 feet:the Visaton and 10 watts, SPL will be 98.9 db whereas the GRS 4PF-8 93.9 db.The difference in 5 may not seem like much, butt, with audio 5-6 db is like Niagara Falls to a garden hose.....if you can, go with the Visaton.Overall Outside Diameter 4.80"Baffle Cutout Diameter 3.70"Depth 1.89"My Best... S
Date published: 2013-01-16
I recently used these in a school project are there any replacements that have more bass? or go lower in frequency?
This depends on how low these are playing. With a 4" driver you can't expect much below 70-80 Hz in a small cabinet. We do offer a few 4" models that will play into the upper 50's in a larger enclosure but they are in the $25-$30 price range.
Date published: 2013-01-26
recommended cabinet size
what size cabinet should be used to place two of these in plus a Dayton Audio DC28F-8 1-1/8" Silk Dome Tweeter? I'm build a cheap custom center channel speaker.P.S. I would prefer a sealed box but a ported box is okay.
A sealed enclosure of approximately 0.25ft³ will yield an F3 frequency of almost exactly 100Hz, which should be quite conducive to your center channel enjoyment.
Date published: 2011-05-24