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GRS 8FR-8 Full-Range 8" Speaker Pioneer Type B20FU20-51FW
i have these mounted in 5 gallon buckets with approximently .67 cubic feet per bucket. should i port the buckets? If so, what diameter and length tube
That volume is basically ideal as a sealed design, I would not recommend porting these if you want smooth bass response. You can expect in room response into the mid to lower 40's.
Date published: 2013-09-30
Are the recommended enclosures dimensions the Outer Dimension?
To choose one - You list: 1) Ported bookshelf: 17-3/4" H x 11" W x 9" D. Use a 2-1/2" diameter port that is 8-1/2" long. That will tune the box to 45 Hz and give you an F3 of 64 Hz.Is the 17-3/4 ; 11 ; and 9 inch dimensions the OD assuming 3/4 inch MDF or Plywood? If so that gives about 17 Litres.
Yes those are external dimensions assuming 3/4" material.
Date published: 2013-09-26
What is the recommended size box for two of these both with port and sealed?
Sealed: 1.43 cubic feet for both, F3 of 78 Hz.Vented: 3.6 cubic feet for both, 3" ID vent that is 1" long provides a tuning frequency of 37 Hz and F3 of 43 Hz.
Date published: 2013-06-10
What is the Port/Vent Dimensions/Volume?
What is the volume/dimension for the port/vent in the vented volume listed in box size section? 1.76 cu. ft., 43hz
The port dimensions for this volume and F3 would be 2" diameter and 1.6" long.
Date published: 2013-10-21
How would these work in a line array?
I would like to build a stackable, portable line array for use with an acoustic instrument group. I will have 2 drivers in each box and those boxes will stack 8 drivers (4 boxes) tall. I would like to keep the boxes as narrow as possible (9.25" wide) for the widest dispersion. If these boxes are sealed, and are 9.25" wide (8.25" interior) by 17.5" tall (16.5" interior), how deep would they need to be for the deepest bass response ?
0.71 cubic ft per speaker is what is required. Multiply 8.25 X 16.5 then by a variable depth to get the number of inches front to back [interior]. My only concern, is that you want a wide dispersion. The nature of a line array is to "throw" sound to the back of the room without causing as many reflections. That means narrow dispersion. The "critical distance" [that point in the room where direct & reflected sound is equal], becomes farther back from the speakers. I have two suggestions. Stack 2 X 2 speakers at around 15-25 degrees to get better side to side dispersion [you could consider a trapezoid box to maintain speaker coupling],AND include a tweeter in every other box to get that clarity needed for acoustic music. I have suggestions below. Nice project!!
Date published: 2013-11-01
Would this work well in an open baffle setup?
This would work well as long as you don't expect much below about 80-100 Hz from it. It would need to be paired with a woofer or subwoofer for best results.
Date published: 2014-02-19
I'm sorry this is a trivial question, but how do you connect one of these speaker drivers to an amplifier? I'm a high school student looking to make a rubens tube and want to use this with a keyboard amplifier. Thanks!
This speaker will have two terminals on it, a positive and negative just like the amplifier. You can use standard 16-18 gauge two conductor speaker wire to connect the two together.
Date published: 2014-02-21
I have a box of 3.84 cubic feet and would like to use these speakers as my mids. My woofer is 12". Should I use ported or sealed unit. Or these too bassy? Am I on the right track and would appreciate any suggestions.
The type and size of enclosure depends entirely on how low you plan to cross this over. If it is any higher than about 250 Hz, the box size and type will make no difference.
Date published: 2014-02-27