Originally Posted by JackNC
I hear you about battling with sketchup. the learning curve is a pain. Once you learn to make each piece of wood into a separate component and to draw each component in place, life gets easier.
two points (maybe more):
1. Dayton UM15-22 is only $20 more and will give almost 2x the extension. At 15.5" OD it just about fits in the same box design.
2. Your box needs more bracing, particularly on the side panels. Ideally there would be less than8" between braces.
3. That may be one of the better plate amps but its not enough to do justice to those drivers. I would go with something like an iNuke 1000 DSP for $299. More power, much much better equalization and crossover capability. Only downside is its not a plate amp and needs a fan swap to cure fan noise. To make best use of it, you'll need a microphone and a sound card and then you are on that slippery slope to full DIY.
4. Someone should take a close look at your tune. Fbox, vent air velocity, are critical. You'll probably need a high pass filter to protect the driver from overexcursion at frequencies below Fbox.
Hey, Jack, I appreciate the feedback. Once I got the hang of Sketchup it really started to get fun.
I should tell you a little more about my room as this may weigh in on the design. The room is 23' x 14' with 18' vaulted ceiling to a 7.5' length wise. I currently own a Epik Legend sub that is corner loaded on the short side of the room. I am hoping a vented sub on the tall side of the room will help fill the room. The sub will be for mostly a HT application. Thoughts??
1. Yeah, I ran models in WinISD and BassBox for both the UM12-12 and the UM15-15. According to the models the 12 seems to look better. Perhaps I need to take another look at the 15. Maybe I punched in some of the numbers incorrectly. Honestly, I have no clue about drivers and what all the numbers mean. I just picket ones from Parts Express that seem reasonable price wise and that seemed to have good reviews. I did notice in some of my research that both the 12 and 15 have a QTS larger that .4 and really should be used in sealed enclosures.
2. I did consider adding more bracing from side to side using dowels I just got lazy and did not add them in the model. I see lots of horizontal braces in the future so I will fiddle with the model and add some bracing tomorrow and see where I get.
3. I really wanted to go with a plate amp. Adding another amp to my setup just causes another set of space issues. Is there another plate amp you could recommend that would work for both the 12 and the 15?
4. I am concerned about the tuning for sure. WinISD and BassBox seemed to give me different numbers for port length. Not sure what that is about. So, what kind of numbers for Fbox and vent air velocity should I want? I understand what the Vent Air Velocity is but not sure I understand Fbox? ARe there some other tools out there to help with some of these calculations?
5. Any advice on what materials I should use?
Here is the VAV plot from BassBox
With bracing:Edited by j_l_martin - 6/12/13 at 9:17am