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Help selecting woofer for boombox
Help selecting woofer for boombox
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Old 30th June 2017, 04:25 AM   #1
LumpyLouis is offline LumpyLouis  United States
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Default Help selecting woofer for boombox

Im looking to build a battery powered boombox with a class d 2x50 amp. I really wish I could do a boominator mini but my budget will fall a few hundred dollars short of that project.

Ill probably go with a 2-way setup with a woofer/tweeter on each channel. I'm looking at parts express woofers in the 6-8" range around $20 or less (some 6.5s are much less). What T/S parameters do I need to look for in a woofer in a strictly oudoor application?
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Old 30th June 2017, 06:50 AM   #2
picowallspeaker is offline picowallspeaker  Italy
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Quote:
Originally Posted by LumpyLouis View Post
Ill probably go with a 2-way setup with a woofer/tweeter on each channel.
So this pertains to Multi-way
Or do you think that full-range applies to whatever produces the audible band ?
For outdoor, I'd choose some treated paper or better polypropylene /phtalate .
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Old 30th June 2017, 12:43 PM   #3
OffGridKindaGuy is offline OffGridKindaGuy  United States
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For decent bass, I wouldn't suggest any driver smaller than an 8 in. in a sealed enclosure. Something with a higher SPL rating. 8 ohm saves battery but 4 ohm will be a little hotter..

Employ a tone control (EQ) and some BSC to help with the bass and control of the upper frequency region of the driver..

An example that won't break the bank..
https://www.parts-express.com/grs-8f...-51fw--292-430
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Old 30th June 2017, 04:51 PM   #4
LumpyLouis is offline LumpyLouis  United States
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Thanks OffGrid! I have posted in the full range forum where I should have posed my question in the multi-way forum (maybe an admin can move this for me?). My plan was to use a 2-way setup.

The numbers for this driver on the PE datasheet are inaccurate according to one of the reviews:

* This data was exported from the Dayton Audio WT3 Woofer Tester
*
* Manufacturer: GRS
* Model: 8FR-8
* Piston Diameter = 165.1 mm
* f(s)= 63.25 Hz
* R(e)= 7.43 Ohms
* Z(max)= 49.80 Ohms
* Q(ms)= 5.702
* Q(es)= 1.000
* Q(ts)= 0.851
* V(as)= 32.170 liters (1.136 cubic feet)
* L(e)= 1.14 mH
* n(0)= 0.78 %
* SPL= 91.00 1W/1m
* M(ms)= 12.67 grams
* C(ms)= 0.50 mm/N
* BL= 6.12


I'm not sure how problematic this would be other than I think will need a larger sealed cabinet than 0.71 ft.. I see the Q(ts) is 0.851 vs the 0.4 listed.

How do I evaluate how directional my woofer will be? For outdoor use I need something that will radiate broadly so that people who aren't in front of the speaker will hear the same/similar sound that those in front of the speaker will hear.
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Old 2nd July 2017, 02:22 PM   #5
OffGridKindaGuy is offline OffGridKindaGuy  United States
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"The numbers for this driver on the PE datasheet are inaccurate according to one of the reviews"

I respect someone using tools as such but I must question how experienced they are in using them.. JMO..

Low frequency leaves the enclosure rather broadly and a portion actually rolls around to the rear, hence the need of Baffle Step Compensation in some cases. Mid/High frequency will always be predominant within the "Beam" pattern of the driver(s). Listeners outside of this beam will hear the lower frequencies at a higher level in an outdoor environment..

Don't plan to fill a football field with sound from a small source. Keep your listening area somewhat small and keep a little distance between the unit and the group. (10-15 Ft.) Place the unit ~4 Ft. off the ground and avoid a flat surface under the unit. (Table top) Pole mount or suspend it from whatever in open air. Then you'll find out how good your build is..
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