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Straight Line Array SB65WBAC25-4
Straight Line Array SB65WBAC25-4
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Old 9th August 2018, 11:08 PM   #1
mlee is offline mlee  Canada
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Default Straight Line Array SB65WBAC25-4

Hi All,

Been lurking with the idea of assembling a straight line array based on the Two Tower, Corner Full Range, Jim Griffin CBT and IDS-25. Thank you for starting and posting in those threads as the information is invaluable!

I originally was going to do a 3-way Open Baffle line array but that was too cost prohibitive with results unknown so straight fullrange line array it is.

After reading through the subjective 3-5inch test threads (also thank you) and based on Jim Griffins glowing recommendation for the SB65WBAC25-4.............just ordered 70 units for a straight line array. Trying to get 35 or so on 1 side.

Will post build and listening impressions with some rudimentary measurements and another endorsement of the full range line array.

Goals are wide dispersion in the upper range, usable down to at least 80hz and small footprint. Will assess the need for a bass array after listening tests performed. Onto the enclosure cutting!

21/2" SB65WBAC25-4 :: SB Acoustics
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Old 10th August 2018, 03:19 AM   #2
perceval is offline perceval  Taiwan
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If you could get 36 of them per array, you could wire them in groups of 6 x 6 and retain the same impedance at 4 Ohms. Good luck!
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Old 10th August 2018, 04:50 AM   #3
mlee is offline mlee  Canada
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Thanks! Dang it already ordered! I can't fit 36, ceiling too low . Seems like 7x5 it might have to be. Looking forward to sound testing.
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Old 10th August 2018, 05:08 PM   #4
xrk971 is offline xrk971  United States
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Straight Line Array SB65WBAC25-4
These are 3.6ohms DCR. 7 series and 5 parallel gives 5.0ohms (almost suitable for an 8 ohm amp) but you will take a slight hit in sensitivity. You may actually be better off making it a true 6 parallel x 6 series with a 3.6ohm 25w dummy resistor hidden in the cabinet to simulate one extra driver. The power you lose is now only 1/36 of the total vs a much more substantial loss from wiring as a 7x5.
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Old 10th August 2018, 05:08 PM   #5
chris661 is offline chris661  United Kingdom
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Quote:
Originally Posted by mlee View Post
Thanks! Dang it already ordered! I can't fit 36, ceiling too low . Seems like 7x5 it might have to be. Looking forward to sound testing.
A 4-ohm-capable amp will be fine with that.

Chris
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Old 10th August 2018, 05:12 PM   #6
mlee is offline mlee  Canada
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xrk971, thanks and good idea. Will keep that in mind.
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Old 10th August 2018, 09:14 PM   #7
mlee is offline mlee  Canada
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Hi All,
Does anyone have any suggestions for cabinet material for a 90" length line array? 3/4" MDF, 1"MDF, 3/4" Canadian birch plywood (this type has some cavities in the middle)? Baltic Birch available here is only 60" square in length.
Thanks,
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Old 10th August 2018, 11:11 PM   #8
5th element is offline 5th element  United Kingdom
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This is going to look and sound amazing.
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Old 10th August 2018, 11:26 PM   #9
mlee is offline mlee  Canada
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Sure hope so, getting excited! Looks like 3/4 inch MDF. Looking at 91" inches for the front panel and 92.5" in total height. Might be close to scrapping the roof when standing this upright . That is with 66mm centre to centre spacing, this might be cutting it too close. Hope the frame tolerance for the SB65 is tight. Might have to relax to 32 drivers per side.
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Old 10th August 2018, 11:32 PM   #10
planet10 is offline planet10  Canada
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Straight Line Array SB65WBAC25-4
Quote:
Originally Posted by mlee View Post
Hi All,
Does anyone have any suggestions for cabinet material for a 90" length line array? 3/4" MDF, 1"MDF, 3/4" Canadian birch plywood (this type has some cavities in the middle)? Baltic Birch available here is only 60" square in length.
Thanks,
you should be able to get 4x8 sheets of murphy ply which is a high grade baltic birch with maple face veneers.

I’ll ping Chris who can tell you which distribs carry it. You should be able to get 12mm sheets which will be sufficient.

MDF is not a great speaker building material. The 12mm quality ply will outperform 3/4” MDF.

dave
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