Crossover points for TMS4 and 1850's |
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Young Croc Joined: 26 June 2005 Status: Offline Points: 767 |
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Posted: 03 July 2008 at 11:00am |
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I'm using some 2 x TMS4 and 4 x 1850's at the weekend. I've never used 1850's with the turbo's before and was wondering what crossover points I should use.
When we run the TMS4 we generally run them 2 way set at 250hz. Given that I'm a bit of a novice can anyone give me some advice on running three way? Thanks |
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Bassmentality: Ska, reggae, funk & Hip hop every month @ The Cellar, Oxford
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Young Croc Joined: 26 June 2005 Status: Offline Points: 767 |
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should I crossover at about 200hz as recommended by the plans?
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Bassmentality: Ska, reggae, funk & Hip hop every month @ The Cellar, Oxford
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Robbo
Old Croc Joined: 05 December 2005 Location: Shropshire Status: Offline Points: 4226 |
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It is not so much the crossover points that you are going to have problems with, but the phasing between the 18" drivers in the TMS4 and 1850 cabinets as the two cabinets have totally different horn path lengths so you will have to have a serious play with your LMS to get them back in phase together.
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Risc_Terilia
Young Croc Joined: 15 December 2007 Status: Offline Points: 699 |
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If you use 48db filters and leave a few hz between the crossover points i don't think you'll have to worry about it. Of course it'll sound slightly better if you do get it right but there are possible work arounds.
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Young Croc Joined: 26 June 2005 Status: Offline Points: 767 |
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does anyone know what the hornpath length for the 1850 is?
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Bassmentality: Ska, reggae, funk & Hip hop every month @ The Cellar, Oxford
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toastyghost
The 10,000 Points Club Joined: 09 January 2007 Location: Manchester Status: Offline Points: 10919 |
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H..
Registered User Joined: 07 August 2007 Location: Thailand Status: Offline Points: 197 |
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Back in the day TMS4 & FS218 would have an overlap i would guess cut the 18" of the TMS around 80Hz and run the 1850 upto 100Hz. play around on your lms, try pink noise and a RTA to get your time alignment right |
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Young Croc Joined: 26 June 2005 Status: Offline Points: 767 |
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I'm still not getting this...sorry for being long winded and ignorant!. If anyone can help me that would be great. After speaking to Turbosound they gave me the following information for the TMS4:
Given the information that's been posted above about the 1850's: The horn length of the 1850 is 62.59 inches, this equates to a full wavelength frequency of 216.77hz and the cutoff point is 54hz. The TMS4 info if it helps is available here: ftp://ftp.turbosound.com/datasheets/legacy%20products/tms4.pdf Can anyone help me out and give me the exact delay settings or the formula and info I need so I can work it out (which will also help me in the future!!)?? Thanks!!! Edited by solution - 03 July 2008 at 3:53pm |
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Bassmentality: Ska, reggae, funk & Hip hop every month @ The Cellar, Oxford
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Young Croc Joined: 26 June 2005 Status: Offline Points: 767 |
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I think i may have got there but it would be good for someone to tell me if I'm right or not:
The 1850 has a hornpath of 62.59 in = 0.00 ms delay TMS4 18" has a hornpath of 39.51 in = 5.22ms delay TMS4 10+1" is already delayed by 3.292 ms so I need to delay by 8.52ms? I've worked it out based on a 1ms delay per ft. If anyone can help that would be great. |
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Bassmentality: Ska, reggae, funk & Hip hop every month @ The Cellar, Oxford
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4DPA
Registered User Joined: 11 April 2007 Status: Offline Points: 1127 |
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path length of the 1850 62.59" less the tms4 path length 39.51" leaves a 23.1" difference to be adjusted for to get the tms4 sub in time with the 1850
delay the tms4 18" by approximately 2ms then to bring the mid/high in time with the two subs delay by 5.292ms |
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bs8901 compliant
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Young Croc Joined: 26 June 2005 Status: Offline Points: 767 |
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thanks for your help 4dpa. We'll take some pics and post them next week.
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Bassmentality: Ska, reggae, funk & Hip hop every month @ The Cellar, Oxford
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