Punisher plots |
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cravings
Old Croc Joined: 30 January 2007 Location: Ireland Status: Offline Points: 7441 |
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would shorting the drivers in the unused boxes get past the dips in testing? just curious.
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minaximal
Old Croc Joined: 26 September 2004 Location: United Kingdom Status: Offline Points: 1780 |
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that is a nice set of responses, a stack of three looks perfectly useable, slowly dropping 3dB from 70hz to 43hz. just dont forget to short the unused cab to get rid of the destructive interference. prog is: roomeqwizard and the berry / dayton mics are fairly reliably flat over this passband, i had a cal file made for mine and there was no deviation to worry about here. |
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doober
Young Croc Joined: 03 January 2006 Location: Cornwall UK Status: Offline Points: 1118 |
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Shorting the unused driver may have helped, concentrating on what we were doing and only adding another cab at a time certainly would have.
I usually high pass mine at 42hz regardless of stack size, although I don't give them huge amounts of power, and I'm not keen on dubstep. Here's the impedance plot As I suspected the spikes are at the same place as the dips in the plots. My understanding of this is that the impedance spikes are caused by larger cone excursion (more back EMF), due to the horn acoustic resistance being lower at these frequencies (or reactance being higher?). This will mean that a cab playing next to it will move the unpowered driver easier at these points, absorbing acoustic energy. I'm still learning with this measurement malarky, this has definitely been a lesson for me. It would have been good to get some more plots with the cabs stood upright in a row, horns to the ground, and upright two high two wide with mouths coupled. Unfortunately time (and daylight) was running out, and I wanted to have a quick play with my new matrix 5000 whilst outdoors. That was painful, in a good way! Kieran |
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doober
Young Croc Joined: 03 January 2006 Location: Cornwall UK Status: Offline Points: 1118 |
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This plot is two punishers compared with 1 18" reflex. Its not really fair because there are two cabs to one, the two cabs get more total power due to the 4 ohm load, and the reflex box is a Behringer. The punishers will gain an extra 3dB due to there being two of them, and another 1.7dB due to the 50% extra power the amp puts out when running 4 ohm load. The point I'm making is that in some situations two punishers would be enough. The berry boxes sound a lot fuller than the plots would suggest, probably due to the rolloff being quite smooth. This sort of response is good enough for chart/pop etc parties, and for smallish band gigs. The punishers actually have a more gentle rolloff than the reflex box. Kieran |
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VaultzPA
Registered User Joined: 28 May 2014 Location: United Kingdom Status: Offline Points: 50 |
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What would you recommend 2 Punishers v2 or 2 18 reflex bins say for instance active ones made by Cerwin vega for use at Disco's and outdoor marquee parties.
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doober
Young Croc Joined: 03 January 2006 Location: Cornwall UK Status: Offline Points: 1118 |
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If you already have the punishers- stick with them. A single 18" reflex cab won't be much smaller than a punisher, and will almost certainly not be as loud. If you are looking at disco/music shop subs you will probably need 4 to do the job that 2 punishers will do.
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