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Precision Devices PD.2150

12K views 23 replies 5 participants last post by  PhilosophyOfSound 
#1 · (Edited)
Ive ordered a PD.2150 which is a 21'' subwoofer containing the following specifications,

Nominal Diameter 53 cm (21”)
Voice Coil Diameter 152 mm (6.08”)
Nominal impedance 4,8 or 16 Ohms
Power Rating 1000 Watts (AES)
Sensitivity (1w / 1m) 99 dB
Frequency Range 30 Hz - 1 kHz
Recommended Enclosure Volume 130-350 Litres
Displacement Limit (peak-peak) 38 mm (1.5”)
Resonance 22 Hz
Voice Coil Copper
Voice Coil Winding Depth 30 mm (1.2”)
Magnet Gap Depth 15 mm (0.59”)
Magnet Material Ceramic
Magnet Weight 6.12 Kg (220 oz.)
Flux Density 1.1 T
Dust Dome Material Paper
Suspension Material Dual Fabric
Cone / Surround Material Paper/Fabric
THIELE SMALL PARAMETERS

Fs 22 Hz
Re 5.48 Ohms
Qts 0.19
Qms 5.51
Qes 0.2
Vas 628 Litres
Mms 305 g
Sd 1630 cm²
Cms 166 µm/N
BL 34.28 T/m
Xmax 10.5 mm
Vd 1.712 Litres
Reference Efficiency 3.39 %

MOUNTING AND SHIPPING INFORMATION

Fixing Holes x 6 Fixing Holes M8
Nett Weight 31.75 Kg (70.17 lb.)
Shipping Weight 33.75 Kg (74.6 lb.)

My goal is to use the design of the
http://www.svsound.com/components/com_virtuemart/shop_image/product/PB13_ULTRA_4ebc79ded07fa.jpg

With this speaker
http://bilder.hifi-forum.de/medium/36504/pd2150_147101.jpg
http://www.toutlehautparleur.com/images/Precision_Devices/2150.dim.gif
 
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#5 ·
Im in a very small room Length 6m Width 3m height 3m, so I think i don't have to compensate allot( heard it has something to do with natural LF lengthening) Any way I do wanna give it the appearance from the SVS PB-13 Ultra.

Im also looking for an amplifier, in between $200 - $500. I don't have much more, maybe the behringer iNuke 6000 DSP.

The receiver I'm using is the Denon AVC A1SE. (do I have to change this or just keep it).
 
#6 ·
Yes, you do have a small room and you'll benefit from room gain.
I would suggest 12 cu.ft. tuned to 21 hz with 800 watts and a hi-pass filter at 18 hz.
Three 4" flared ports 17" long would handle the porting.
The ports should be evenly spaced across the width of the box.
Total internal cabinet volume would be about 13 cu.ft to account for all displacements.
An example of a 13 cu.ft cabinet would be approximately 30" high x 28" wide and 31" deep, assuming 3/4" material.
You can fine tune the exact measurements to suit your needs here:

http://www.hometheatershack.com/forums/enclosure-volume-calculator/#axzz2CBUw89tm


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#7 · (Edited)
Yes, you do have a small room and you'll benefit from room gain.
I would suggest 12 cu.ft. tuned to 21 hz with 800 watts and a hi-pass filter at 18 hz.
Three 4" flared ports 17" long would handle the porting.
The ports should be evenly spaced across the width of the box.
Total internal cabinet volume would be about 13 cu.ft to account for all displacements.
An example of a 13 cu.ft cabinet would be approximately 30" high x 28" wide and 31" deep, assuming 3/4" material.
You can fine tune the exact measurements to suit your needs here:

http://www.hometheatershack.com/forums/enclosure-volume-calculator/#axzz2CBUw89tm
This is an awesome input, I will be using 1.4'' MDF (should be thick enough) and was planning to use a bracing like this http://www.hometheatershack.com/for...2611-what-type-sub-do-i-need-serious-sub1.jpg
 
#22 ·
Expected but a month ago it was also expected, and they lost my trust on their integrity. From the moment I called them the guy said, well we have one. 3 days later I got a message that they didn't have it on stock. Maybe I'm unreasonable but I'm not waiting on something that isn't sure, Thats frustrating as it gets especially with my Autism.
 
#23 ·
Very frustrating indeed, I would be too even though I'm not autistic.
It's a hard to find driver, sorry I don't have more time, would love to help your quest for this driver.
I'm sure you know http://europe-audio.com/
Maybe they have some replacement for the PD. Didn't look myself yet but pricing seems reasonable.
 
#24 ·
They don't have good 21'' speakers, and the only other would be the 21LW1400 which would not perform good (lower xmx). It's a shame because other people around here would get ideas either. On the other hand I will make satellites so I can still provide ideas. Anyway thanks for your help I appreciate it.:T
 
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