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Hd15’s |
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Msnell83 
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Joined: 16 October 2017 Status: Offline Points: 61 |
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 Posted: 18 October 2017 at 8:58pm |
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Cheers norty, we’ve decided on building a couple of dual 18” g subs and a smaller mid tops cab than the mt122. Then if we’re feeling lairy we can always build a couple more g’s and wheel out the mt and start trying that out. You’re right though that mt122 is big old lump, wont need the gym membership if I’m gonna be dragging that thing around with me!
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norty303
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Joined: 18 August 2004 Location: Eastbourne Status: Offline Points: 8806 |
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Posted: 20 October 2017 at 12:26pm |
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Have a good think about what driver you're going to use for mid in that case.
You may find that crossing from a 12" into an 18" leaves you with insufficient energy in the low mid/upper bass region, and basslines lack attack. You could go with a 15" mid, but you then make some concessions on quality of the midrange unless you go 3 way top (imho) 2x12" mid cabs in a reflex loading can be surprising in a good way, and be plenty loud enough, especially if you're not trying to get them too low. |
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Msnell83
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Posted: 20 October 2017 at 3:37pm |
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Well we’ve got two hd15’s we were going to chuck in the mixer too ;)
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norty303
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Posted: 20 October 2017 at 4:02pm |
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2x HD15 will seriously struggle against 2x 2x18 reflex.
I had 3x HD15 per dual 18 box and it was about right. |
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bob4
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Joined: 29 February 2004 Location: Finland/Germany Status: Offline Points: 1843 |
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Posted: 20 October 2017 at 5:19pm |
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4 x BMS 15s330 reflex loaded can move surprising amounts of air though......
 4 single 15" boxes will be much smaller too compared to a Gsub. And scaleable. Small party in a front room? Take one box, fits even the smallest of cars, sorted! try the same with a Gsub..... 
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Msnell83
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Posted: 22 October 2017 at 5:47am |
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Yeah I think we’re gonna try two hd15’s with the one 2 x 18 and and the smaller mid tops, which brings me on to my next question. Does anyone know what delay setting to use to match the phase on an hd15 and a g sub!?
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Msnell83
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Posted: 22 October 2017 at 5:59am |
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I’m guessing time alignment/phase alignment are the same issue and get sorted by putting a delay on the g sub in the dsp?
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norty303
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Posted: 26 October 2017 at 12:49pm |
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Trick for time aligning.
Play a sine wave at the crossover frequency and flip the polarity on one of the frequency bands you want to align. Then start to add delay to the box that's furthest forward (in your case the reflex box) until you hear the most cancellaton. Then flip the polarity back and you're done. |
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toastyghost
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Joined: 09 January 2007 Location: Manchester Status: Offline Points: 10919 |
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Posted: 26 October 2017 at 3:19pm |
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Except you aren't. This is really getting old now, to be honest. |
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Pasi
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Posted: 26 October 2017 at 7:10pm |
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Welcome to the club Toasty. |
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toastyghost
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Posted: 26 October 2017 at 7:59pm |
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When do I get my official stick to wave angrily at people? |
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Msnell83
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Posted: 27 October 2017 at 8:48am |
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Ok well norty’s method sounds like it could be good for getting in the right ball park and then adjust from there. I was thinking that each cabinet would have a known horn length or wave path (if that’s even a term?) that would equate to a time in ms, and that these could be used to calculate delays in relation to the other cabinets. For example an hd15 (assuming you’ve followed the plan right) would have a distance of x metres, and that this would equate to x Mili seconds for the wav to get from the cone to the edge of the cabinet.
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norty303 wrote: