Turbomax Reflex - It begins...

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   Aren't ports against a wall of the cab meant to offer a lower tuning than calculated anyway?

I'll have a go with the high pass, though having looked at the cone movement during breakdowns with silly sustained low sub noises it looks very controlled but then again they aren't full power, it's just when the tracks going full pelt that it starts to lose it around the 900W mark.

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SteveAATW Members Profile Send Private Message Find Members Posts Add to Buddy List Young Croc Joined: 04 September 2007 Status: Offline Points: 1173	Post Options Post Reply Quote SteveAATW Report Post Thanks(0) Quote Reply Posted: 10 July 2009 at 1:19pm
	Aren't ports against a wall of the cab meant to offer a lower tuning than calculated anyway? I'll have a go with the high pass, though having looked at the cone movement during breakdowns with silly sustained low sub noises it looks very controlled but then again they aren't full power, it's just when the tracks going full pelt that it starts to lose it around the 900W mark.

paulus Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 14 December 2005 Location: SOUTH BIRMINGHA Status: Offline Points: 3181	Post Options Post Reply Quote paulus Report Post Thanks(0) Quote Reply Posted: 10 July 2009 at 3:57pm
	this is what worried me when i fitted the turbomaxx in my cabs the amount it moved!!!!!my boxes are braced to the hilt(ASS SCOOPS) BUT even they move backwards with the turbos in running at 3kw(the 1850s never moved the boxes and they are 12 stone each!!!)love to heard those cabs
	TRENDSETTER SOUND SYSTEM

paulus Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 14 December 2005 Location: SOUTH BIRMINGHA Status: Offline Points: 3181	Post Options Post Reply Quote paulus Report Post Thanks(0) Quote Reply Posted: 10 July 2009 at 3:58pm
	just to add they are the 1200is on the old fane chassis running 25-75 hz 48db both ends
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SteveAATW Members Profile Send Private Message Find Members Posts Add to Buddy List Young Croc Joined: 04 September 2007 Status: Offline Points: 1173	Post Options Post Reply Quote SteveAATW Report Post Thanks(0) Quote Reply Posted: 10 July 2009 at 4:10pm
	Did the cone make any noise once you got up to the higher limits of its rating? It's hard to tell whether its the cone or the box moving or the surroundings rattling but it definitely sounds like the cone

SteveAATW Members Profile Send Private Message Find Members Posts Add to Buddy List Young Croc Joined: 04 September 2007 Status: Offline Points: 1173	Post Options Post Reply Quote SteveAATW Report Post Thanks(0) Quote Reply Posted: 11 July 2009 at 10:21pm
	Hmm, put the tuning into WinISD to double check it (used Bassbox for the main design), it came out near enough the same. However one graph did make me wonder, this is the turbomax cab, and then the same cab with a 600W 18XB in. What's the dip all about? And are the manually entered T/S parameters for the Turbomax missing some data in comparison to the 18XB?

Contour Members Profile Send Private Message Find Members Posts Add to Buddy List Young Croc Joined: 03 March 2004 Status: Offline Points: 625	Post Options Post Reply Quote Contour Report Post Thanks(0) Quote Reply Posted: 11 July 2009 at 10:38pm
	Did you enter x-max data? Best regards, Walt

Timebomb Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 11 October 2004 Location: Lancaster Status: Offline Points: 2717	Post Options Post Reply Quote Timebomb Report Post Thanks(0) Quote Reply Posted: 12 July 2009 at 2:20am
	Excursion peak above the port tuning, the max input power the cab is capable of taking is limited by the xmax of the driver in that frequency range. It can take more power down low as the port is reducing excursion. If you were using that driver id suggest a little boost and 40Hz and a cut at 54Hz, it would increase overall power handleing of the cab, or maybe even dial it in as a dynamic EQ on the DCX if you have one? , so it only kicks in at high power. Edited by Timebomb - 12 July 2009 at 2:29am
	James Secker facebook.com/soundgearuk James@soundgear.co.uk www.soundgear.co.uk

SteveAATW Members Profile Send Private Message Find Members Posts Add to Buddy List Young Croc Joined: 04 September 2007 Status: Offline Points: 1173	Post Options Post Reply Quote SteveAATW Report Post Thanks(0) Quote Reply Posted: 12 July 2009 at 4:45pm
	Sorry brain fart, forgot about the xmax issue on the 18XB The only thing it might be is the shelf port against the wall affecting the tuning to the extent that its very low and its starting to impact on the 30Hz region which will push the Turbomax towards xmax. Is there any definitive way of physically finding out the tuning, or of calculating the affect of putting the port shelf against the wall of the cab?

ceharden Members Profile Send Private Message Find Members Posts Add to Buddy List The 10,000 Points Club Joined: 05 June 2005 Location: Southampton Status: Offline Points: 11776	Post Options Post Reply Quote ceharden Report Post Thanks(0) Quote Reply Posted: 12 July 2009 at 5:38pm
	I think WinISD calculates based on sine wave signals so the excursion is worst case. I wouldn't worry too much unless the predicted excursion goes several mm over xmax at full power input. In the above example, the input power is on a linear scale, if you converted it to log (dB scale) then you'll find the dip is probably only 2dB or less. What is the cabinet volume and port tuning for those plots?

SteveAATW Members Profile Send Private Message Find Members Posts Add to Buddy List Young Croc Joined: 04 September 2007 Status: Offline Points: 1173	Post Options Post Reply Quote SteveAATW Report Post Thanks(0) Quote Reply Posted: 12 July 2009 at 6:21pm
	195L tuned to 39Hz iirc Interestingly just put the Sub18 into Bassbox. The design claims 35Hz, Bassbox says 42.97Hz Put the Q Sub in and Bassbox is claiming 45.6Hz (which is fairly near I think). Just wondering how far out the calculated is from the real for shelf/corner ports

ceharden Members Profile Send Private Message Find Members Posts Add to Buddy List The 10,000 Points Club Joined: 05 June 2005 Location: Southampton Status: Offline Points: 11776	Post Options Post Reply Quote ceharden Report Post Thanks(0) Quote Reply Posted: 12 July 2009 at 6:33pm
	In the actual cab the port will be effectively extended. Simulation software doesn't seem to take that into account very well. When designing port lengths in WinISD I generally set the tuning up to 5Hz higher than I want it to be on the real cab.

SteveAATW Members Profile Send Private Message Find Members Posts Add to Buddy List Young Croc Joined: 04 September 2007 Status: Offline Points: 1173	Post Options Post Reply Quote SteveAATW Report Post Thanks(0) Quote Reply Posted: 12 July 2009 at 7:12pm
	I had a second set of panels cut and ready to go subject to testing the first one (let's face it, I was bound to cock at least part of it up), I'll try modifying the port length accordingly. Much lower tuning than expected would explain it though - it didn't kick as hard as expected but went devastatingly low (was resonating 18mm MDF bar panelling 20 yards away)