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problem modeling with WinISD for Dayton Titanic 1200

4K views 12 replies 3 participants last post by  Binary 
#1 ·
Hi,

I've been a reader for quite a while, just registered on the site as it seems to have the best information available.

I have WinISD, and put the paramaters of this driver, a Dayton Titanic 1200, PN 295-400,and I'm coming up with very odd results. When I called PE about the driver, they have nothing on it. Where I'm coming up with a screwy number I believe is the listed SPL versus what WinISD calculates being off almost 20db (!). Obviously, it's not showing optimum output, but the cone excursion when ballparking PE's "recommended" enclosure size looks weird too.

Idea is a sealed 2.5 cu ft (70.79 ltr) sonotube, powered (for now) by a proficient M3, rated at 180w. This level of power seemed appropriate for this driver, and I'm not going for extreme overkill. I listen to alot of music, but this will be in my HT setup as well. AV receiver is a HK AVR347 powering several old Sansui floor standers (Kabuiki Theater!). Lowpass will be around 80hz, as I get respectable output before a steep roll off from the Sansui's.

I have an eclipse 88120.4 (TC 1000 dual 4) that I could use, but I think it'd be severely underpowered with this amp.

Anyway, if someone can assist on properly modeling the Old Titanic, I'd greatly appreciate it.

Specs:
Parameter Specification
Sens. 2.83v/1m 90 dB
Impedance (nom. Z) 4 ohms
Power Handling (rms) 350 W
Fs 16.26
Qts .407
Qms 8.226
Qes .428
Vas (ft3) 9.89
Vas (liters) 280.16
Cms (µm/N) 932.37
DCR (W ) 3.66
Levc (mH) 1 KHz 1.963
BL (Tesla m) 9.47
Sd (in2) 71.30
X max; one way (linear mm) 14.22
Vd (linear ft3) .0231
Vd (peak ft3) .0387
Mms (grams) 102.73
Magnet Weight (oz) 84.0
Coil length (mm) 38.1
Coil diameter (in) 2
Gap Height (mm) 9.6


Thanks ~ Steve
 
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#2 ·
Welcome Steve!

2.5 cu.ft will have a Q of .9 which will sound boomy, 5 cu.f.t would have a Q of .7. Is the Proficient M3 a 4 ohm amp? I can't find any specs on it.

Here's the driver file for the Titanic 1200.

View attachment Dayton Titanic 1200.wdr

Here is how it models in 2.5 cu.ft with 180 watts.

Text Oscilloscope Line Slope Technology
 
#3 ·
Ah, many thanks, that looks tons better than what I was seeing. The proficient is a 4 ohm amp, yet another thing that holds me back from trying out the TC, unless I were to use a single voice coil.

Also, I appreciate the driver file, I'll play with it ported also and see if it looks any better. I think my overall current front stage will overpower that sub sealed.

S
 
#8 ·
I wish I could figure out how to save screen and post it.

90ltr, tuned to 18hz. Port length may become an issue to overcome inside a sonotube that small.

If I can do a couple mm in excursion, that'll leave me some more, but puts it right at xmax at 35hz or so.

The amp is 180w at 4ohms, 0-3db boost at 40hz, 4th order LW variable. Unknown if it has a highpass filter or not (but I assume so).
 
#12 ·
Will do. I'm waiting on my local concrete supplier to get some 16" sonotube in. Doing some reading, the THT build for this may work also, as I have the room for a 36x36x18. The output with the THT may do a better job of keeping up with my higher sensitivity mains (95db).

If all works out, I'll do an A/B comparison with the same driver and amp in both enclosures.
 
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