lukeamdman Posted January 25, 2017 Author Share Posted January 25, 2017 Top is on as well as the bracing for the baffle: Link to comment Share on other sites More sharing options...
lukeamdman Posted January 26, 2017 Author Share Posted January 26, 2017 Link to comment Share on other sites More sharing options...
Ricci Posted January 26, 2017 Share Posted January 26, 2017 One half way down 7 to go? I forget what are you powering these with? 2x SP-12000's? Link to comment Share on other sites More sharing options...
lukeamdman Posted January 26, 2017 Author Share Posted January 26, 2017 One half way down 7 to go? I forget what are you powering these with? 2x SP-12000's? Yep. Link to comment Share on other sites More sharing options...
lukeamdman Posted January 27, 2017 Author Share Posted January 27, 2017 Final piece is on! Link to comment Share on other sites More sharing options...
Ricci Posted January 27, 2017 Share Posted January 27, 2017 I know it's a way off but an impedance curve would be nice whenever you get around to it. That'll tell us roughly where the tune ended up and how bad the vent resonance is. I bet the tune comes in lower than the sim. Link to comment Share on other sites More sharing options...
lukeamdman Posted January 27, 2017 Author Share Posted January 27, 2017 I know it's a way off but an impedance curve would be nice whenever you get around to it. That'll tell us roughly where the tune ended up and how bad the vent resonance is. I bet the tune comes in lower than the sim. That's what I'm doing first whenever I drop the driver in tonight or tomorrow. WinISD said the port length should be 64" for a 15hz tune in 11.72cu.ft, but I made the port about 55" instead based on some feedback from LTD and notnyt. Link to comment Share on other sites More sharing options...
lukeamdman Posted January 28, 2017 Author Share Posted January 28, 2017 1/4" round over and ready for testing! Link to comment Share on other sites More sharing options...
Rowan611 Posted January 29, 2017 Share Posted January 29, 2017 Looking good man. Really like that round over. How are you getting this downstairs? Link to comment Share on other sites More sharing options...
lukeamdman Posted January 29, 2017 Author Share Posted January 29, 2017 Looking good man. Really like that round over. How are you getting this downstairs? I had one of my brothers over to help me out. Took a nice chunk out of the drywall getting it down there too! Oops. Link to comment Share on other sites More sharing options...
lukeamdman Posted January 29, 2017 Author Share Posted January 29, 2017 I know it's a way off but an impedance curve would be nice whenever you get around to it. That'll tell us roughly where the tune ended up and how bad the vent resonance is. I bet the tune comes in lower than the sim. Here you go Josh: Min is 13.8hz (4.5ohm), max is 38hz. Two of these will be paralleled to a channel of the SP2-12K. Link to comment Share on other sites More sharing options...
lukeamdman Posted January 29, 2017 Author Share Posted January 29, 2017 Those are 1.5" ports on my mains: I was comparing various music tracks and movie clips to one of the dual sealed boxes: Looks like that 90deg turn and the port proximity to the side wall lowered the tune by 1hz. Oh darn No port noise to speak of, and 12-20hz one of these is louder and cleaner than one of the dual sealed boxes. Definitely the reduction in harmonic distortion in that range I was looking for. Link to comment Share on other sites More sharing options...
lukeamdman Posted January 30, 2017 Author Share Posted January 30, 2017 I had a few minutes to run some sweeps. This is with no EQ or XO (receiver set to the max of 250hz), and I did lower the dual-opposed sealed sub by 3db since the DCR is half (1.5ohm vs. 3.0ohm) because two drivers are paralleled. The sealed still has an advantage though since it has twice the Sd but you get the idea and this isn't completely apples to apples anyway since they're not positioned the same in the room: Ported vs. ported with a 14hz BW3 HPF: Link to comment Share on other sites More sharing options...
Ricci Posted January 30, 2017 Share Posted January 30, 2017 Looks like your tuning came in at 14Hz or so from the impedance curve. Nice. What are you setting a HPF at 14Hz with? Minidsp? Link to comment Share on other sites More sharing options...
lukeamdman Posted January 30, 2017 Author Share Posted January 30, 2017 Looks like your tuning came in at 14Hz or so from the impedance curve. Nice. What are you setting a HPF at 14Hz with? Minidsp? Yes, a MiniDSP 10x10HD. Link to comment Share on other sites More sharing options...
Infrasonic Posted January 30, 2017 Share Posted January 30, 2017 Well done! I'm surprised it worked as well as it did. Good work. So now.... seven more? *shudders* Link to comment Share on other sites More sharing options...
lukeamdman Posted January 30, 2017 Author Share Posted January 30, 2017 Well done! I'm surprised it worked as well as it did. Good work. So now.... seven more? *shudders* What I assembled over 4 days before (basically everything but the baffles), I'm going to assemble in a single evening, so that should cut the build time in half at only 3 days per box. Link to comment Share on other sites More sharing options...
maxmercy Posted January 31, 2017 Share Posted January 31, 2017 Do you have an umbrella policy on your house that covers 'structural damage from sound system' and/or 'Acts Attributed to the Bass Gods'? JSS Link to comment Share on other sites More sharing options...
SME Posted February 1, 2017 Share Posted February 1, 2017 The resonance looks a bit high Q, but that could just be a room thing too. I'd probably want to try to knock it down a bit with a PEQ. Link to comment Share on other sites More sharing options...
lukeamdman Posted February 1, 2017 Author Share Posted February 1, 2017 The resonance looks a bit high Q, but that could just be a room thing too. I'd probably want to try to knock it down a bit with a PEQ. These with have a 32hz BW3 LPF with othorns taking over above that. Link to comment Share on other sites More sharing options...
SME Posted February 2, 2017 Share Posted February 2, 2017 Err, I meant there's of bump visible at the tuning frequency. Link to comment Share on other sites More sharing options...
lukeamdman Posted February 2, 2017 Author Share Posted February 2, 2017 Err, I meant there's of bump visible at the tuning frequency. Ah gotcha. Link to comment Share on other sites More sharing options...
lukeamdman Posted February 2, 2017 Author Share Posted February 2, 2017 Last night I removed the DO sealed cabinet and pushed the ported cab closer to the back wall and it mostly fixed that dip between 50-70hz. With just one of these I was hitting 128-129db during the 17hz note of Bass I Love You, and 121-122db during the 14hz note of Curtain Shaker. Still no port noise. +18db with 7 more! Just because it'll bug me if I don't, I'm going to do a 1/2" round over on the ports and also add a tiny bit of bracing. Link to comment Share on other sites More sharing options...
Ricci Posted February 2, 2017 Share Posted February 2, 2017 Are you firing the ports and drivers forwards so you can get that standing in front of a box fan wind effect? Plug 2 ports on each cab for the sub 10Hz tuning? Link to comment Share on other sites More sharing options...
lukeamdman Posted February 2, 2017 Author Share Posted February 2, 2017 Are you firing the ports and drivers forwards so you can get that standing in front of a box fan wind effect? Plug 2 ports on each cab for the sub 10Hz tuning? lol no. They'll be firing at the side walls. It's going to be a tight fit. They'll be 2" from the back wall and only 10" from the side walls, but it's the only way to make it work. Link to comment Share on other sites More sharing options...
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