Thinking 46L x 30w x 22.5h
Center vent..not sure dimensions
Baltic birch... .75
Got 12 PD186 ON THE WAY
Center vent..not sure dimensions
Baltic birch... .75
Got 12 PD186 ON THE WAY
The high qts us going to result in a seriously droopy ebs alignment in your proposed box size if you attempt to tune to 32hz.
MAybe model and consider tuning lower for 6th order alignment. Depending on how loud and low you want to go you might get away with mid 20s.
Just a thought.
Just a thought.
Well, the pioneers of audio [electrical & mechanical engineers with a few physicists rounding them out] claimed that the ideal ratio of air mass to driver suspension compliance ratio for a bass reflex [vented] was 1.44 and when tuned to Fs had the optimum transient response, i.e. ~136.28 L tuned to Fs based on published specs, whereas a T/S max flat alignment is ~453.55 L tuned to ~27.7 Hz, though due to differences in the various program’s math the latter can be a bit different, but not audibly so.
Anyway, here’s a quick comparison sim of the two and any alignment between these two are considered acceptable [and common] depending on what performance trade-offs you choose. As you can see, it’s about trading peak power SPL for a lower tuning and inaudibly smoother transient response [HR files attached].
Decided to do a TH to compare to the ‘classic’ BR even though it’s probably too large [HR file attached]. Note that since the TH doesn’t have much of a ‘tail’ below the line, its transient response is the best of the bunch. Note too that all sims have no damping to speak of, so all the little squiggles and high Q peaks are normally absent or at least extremely muted.
GM
Attachments
GM...thanks
Looks to be a 5db difference at cut off
It seems like most typical double 18 cabinets are tuned to 35hz for more power..spl
Looks to be a 5db difference at cut off
It seems like most typical double 18 cabinets are tuned to 35hz for more power..spl
Greets!
Yes [if I understand your question], I use Prof. Leach's compression horn design routine to design them, so it's 'weak' motor is accounted for in its Qes spec.
GM
Yes [if I understand your question], I use Prof. Leach's compression horn design routine to design them, so it's 'weak' motor is accounted for in its Qes spec.
GM
Yes I agree
For more volume and power ratio..
I believe 36hz vent would be better
22.5h x 30d x 22.5w
I am seperating them with a divider so it will be 2 seperate boxes in one
Now I need a vent calculated
Hi,
Can you refer to the right specs link? Note: they don't model/fit for the same enclosures.
Old/previous Precision Devices PD.186 and new PD.186/2
PRECISION DEVICES PD 186, 8 Ohms Fs 27.00Hz VAS 353.00L Qts 0.313, Xmax± 9.0mm, Sens.96.9 dB/2.83V/m
PRECISION DEVICES PD.186/2, 8 Ohms Fs 34.18Hz VAS 192.15L Qts 0.523, Xmax± 10.5mm, Sens.94.6 dB/2.83V/m
link PD.186/2
Can you refer to the right specs link? Note: they don't model/fit for the same enclosures.
Old/previous Precision Devices PD.186 and new PD.186/2
PRECISION DEVICES PD 186, 8 Ohms Fs 27.00Hz VAS 353.00L Qts 0.313, Xmax± 9.0mm, Sens.96.9 dB/2.83V/m
PRECISION DEVICES PD.186/2, 8 Ohms Fs 34.18Hz VAS 192.15L Qts 0.523, Xmax± 10.5mm, Sens.94.6 dB/2.83V/m
link PD.186/2
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