Open Back spkr project

tajanes · April 2018

Latest project I went with an Open Back design, altered the H frame to a V configuration, and kept top of spkr open for the mid/tw sub box (opportunity to switch out), and kept overall size and width of speakers ~reasonable (for my room).

Thoughts were: V design offsets loading (spkrs at 30 degrees) and cancelation a bit (~offset drivers positioning relative to front baffle), preference to keep spkr frames & their related distortions towards back (its not about noise level equalization front to rear, its about getting best sound forward...), wanted to provide flexibility to try different top box set-ups (full range, M Tw, coax, etc) and this set-up provides some isolation (rubber feet on top box) from the woofer section.

Currently running with miniDSP targeting 4th order LR crossover ~280Hz top from W section (and allows for eq -6db of open back design), dual Beyma 12BR70s (http://www.usspeaker.com/beyma 12BR70-1.htm), the top W’s (which angle slightly downward) have an additional .38mH inductor (thx to Meniscus Audio)

I initially tested a pair of 10’s and was fairly satisfied with the low frequency capability, just ended up going with the 12s to get the lows with a bit less drama (movement). Dimensions: width 14 3/8 , height 41 1/4, depth of frame 6, depth of base 10 ½

Continue to work with crossover points / slopes / eq of OB design, getting these right are difficult with open design