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GRS 4PF-8 4" Paper Cone Foam Surround Woofer
My cabinet has a cut out of 4.25 will this fit or should I go with the 5 inch woofer?
This woofer will be too small and the 5" would be too large. You would be better off enlarging the hole to fit the 5" since that is easier to do.
Date published: 2014-03-31
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: 2014-04-24
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
This will work well for an application like this although we cannot say whether you will see an improvement in sound or not. The holes are on a 4-1/8" circle.
Date published: 2013-01-15
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
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
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