Hi all, my name is chloe and i used to run a home theater installation buisness. i have recently become disabled and have decided to follow a little dream of mine in building a awesome sounding subwoofer for my home.Budget is a concern but cabinet is not, as i have a professional cabinet maker willing to help me out. i really need a design for a Pyle Pro PDW18125 18 inch subwoofer. I am barely familiar with specifications and design , so here is a list of what i was given. power 800w rms, 8 ohm, fs 33hz Qms 4.0 Qes .295 Qts .275 spl 101 and Vas 305.8 liters. i was going to build a sealed cabinet , but from what i read that is a waste of the resources i have avalable, aka driver, all the amplification i need, and a professional cabinet maker. hopefully you guys can help me out, you can reach me at 650-888-0754 if you have other questions, or e-mail me. thank you guys a ton, chloe 🙂
more info
Hello all, heres some more clarification. ok, my room is 12x23ft and i plan to use this mainly for music listening, with some home theater. i like really loud bass, and i am going to use a parasound HCA-1500 amplifier with a NHT X1 crossover to run it. i have a marantz avp-7701 preamp and a stack of 5 NHT A1 amplifiers for my main speakers, a set of Klipsh RF5 mains with some RF3's in the back and the RF center. i am currently using 4 12" subwoofers, 2 sealed NHT w2's and 2 Power Acoustic MOFO 12's in a ported car audio box. i like the sound i get from the sealed W2's but they dont output enough, which is why i am making the 18" sub. this will replace the 2 12" PA MOFO subs. i am guessing i need to get to the 24-30 hz range to get the type of bass that i am looking for and am really looking forward to get this subwoofer up and running. please help with a suggestion or a design, i have alot of resourses available in the next few days but i am running blind on what to do. thanks a ton, chloe.
Hello all, heres some more clarification. ok, my room is 12x23ft and i plan to use this mainly for music listening, with some home theater. i like really loud bass, and i am going to use a parasound HCA-1500 amplifier with a NHT X1 crossover to run it. i have a marantz avp-7701 preamp and a stack of 5 NHT A1 amplifiers for my main speakers, a set of Klipsh RF5 mains with some RF3's in the back and the RF center. i am currently using 4 12" subwoofers, 2 sealed NHT w2's and 2 Power Acoustic MOFO 12's in a ported car audio box. i like the sound i get from the sealed W2's but they dont output enough, which is why i am making the 18" sub. this will replace the 2 12" PA MOFO subs. i am guessing i need to get to the 24-30 hz range to get the type of bass that i am looking for and am really looking forward to get this subwoofer up and running. please help with a suggestion or a design, i have alot of resourses available in the next few days but i am running blind on what to do. thanks a ton, chloe.
You really need to get the thiel / small parameters measured for that woofer. What you have put down sounds like the usual crap they send with their "woofers". It will most likely need a huge box to get any usable low bass. If you can bring that Pyle woofer back I would suggest getting another brand.
thanks for reply
thanks for the reply. i dont know how to get a thiel measurement, but it might be more possible to get specs from pyle. is there anything else i should ask for?
thanks for the reply. i dont know how to get a thiel measurement, but it might be more possible to get specs from pyle. is there anything else i should ask for?
Assuming Pyle even responds, I imagine they’ll just refer you to the owner's manual here: PylePro - PDW18125 - 18'' Performance Optimized High Power Subwoofer
You'll see in the pdf that the specs are different from what you have and it being Pyle, I doubt either are accurate enough to use for your driver unless you oversize the cab enough to allow some tuning flexibility, though these are probably much closer to reality.
Note too that its inductance [Le] isn’t listed, which is usually a good indicator that it’s high enough to impact its bass performance and that the rest of the specs are somewhat bogus too. Just measuring off the impedance chart indeed it is fairly high at ~2.34 mH/1 kHz.
Anyway, just to show the difference between your specs and theirs for a typical T/S max flat vented cab alignment………
Yours = 108.863 L net/44.74 Hz Fb
Theirs = 460.744 L net/27.45 Hz Fb
Quite a difference and it won’t surprise me if yours will ideally need a 20+ft cab to get down lower in the 20s.
There’s probably at least 10,000 forum threads, websites with Thiele/Small [T/S] measurement tutorials, so search the forums here or Google/whatever how to measure them using without/with a computer or with dedicated test gear or even the way we did it before computers.
GM
You'll see in the pdf that the specs are different from what you have and it being Pyle, I doubt either are accurate enough to use for your driver unless you oversize the cab enough to allow some tuning flexibility, though these are probably much closer to reality.
Note too that its inductance [Le] isn’t listed, which is usually a good indicator that it’s high enough to impact its bass performance and that the rest of the specs are somewhat bogus too. Just measuring off the impedance chart indeed it is fairly high at ~2.34 mH/1 kHz.
Anyway, just to show the difference between your specs and theirs for a typical T/S max flat vented cab alignment………
Yours = 108.863 L net/44.74 Hz Fb
Theirs = 460.744 L net/27.45 Hz Fb
Quite a difference and it won’t surprise me if yours will ideally need a 20+ft cab to get down lower in the 20s.
There’s probably at least 10,000 forum threads, websites with Thiele/Small [T/S] measurement tutorials, so search the forums here or Google/whatever how to measure them using without/with a computer or with dedicated test gear or even the way we did it before computers.
GM
impedance 8 ohm
ok, i found the impedence ,8 ohm, and wanted to thank you also for the reply GM. i will try to get you a thiel measurement but i will be out of town for a few days. thanks again, chloe
ok, i found the impedence ,8 ohm, and wanted to thank you also for the reply GM. i will try to get you a thiel measurement but i will be out of town for a few days. thanks again, chloe
tyvm all
thanks for the replys all. and soundimpressions, i like the thing you state on your post about if its worth doing. That's my entire idea on this. i want to build it 1x, and have it be a awesome subwoofer that i show my grandson someday and he goes' " grampa, thats awesomelydudeical coolrad!". i have a loud music bug that i have had all my life and finally have a chance to play! thanks all, chloe
thanks for the replys all. and soundimpressions, i like the thing you state on your post about if its worth doing. That's my entire idea on this. i want to build it 1x, and have it be a awesome subwoofer that i show my grandson someday and he goes' " grampa, thats awesomelydudeical coolrad!". i have a loud music bug that i have had all my life and finally have a chance to play! thanks all, chloe
Driver Properties
Name:
Type: Standard one-way driver
Company: Pyle
No. of Drivers = 1
Fs = 33 Hz
Qms = 4
Vas = 305.8 liters
Cms = 0.014 in/lb
Mms = 10.26 oz
Rms = 33.25 lb/s
P-Dia = 18 in
Sd = 254.5 sq.in
Qes = 0.295
Re = 8 ohms
Z = 9.6 ohms
BL = 9.091 lb/A
Pe = 800 watts
Qts = 0.275
no = 3.592 %
1-W SPL = 97.7 dB
2.83-V SPL = 97.7 dB
-----------------------------------------
Box Properties
Name:
Type: Vented Box
Shape: Prism, square
Vb = 3.828 cu.ft
Fb = 25 Hz
QL = 6.387
F3 = 80.84 Hz
Fill = minimal
No. of Vents = 2
Vent shape = round
Vent ends = one flush
Dv = 3 in
Lv = 12.99 in
The box volume is what the software recommended, and did yield the best response. If that is too big, let me know and I can work it smaller and give the choice of response.It has a pretty smooth roll off. I can email you the pdf file that has diagrams, response charts and the cut list for the enclosure pieces, just PM me an email address. Also, take not that the front baffle is 1.5 inches thick. With a large driver like this, I always make a laminated fornt, it's so much stiffer that way. Just glue tow layers of 1.5 MDF to make it. There is also an internal brace 3x18.5.x.75 to span the inner walls.
Name:
Type: Standard one-way driver
Company: Pyle
No. of Drivers = 1
Fs = 33 Hz
Qms = 4
Vas = 305.8 liters
Cms = 0.014 in/lb
Mms = 10.26 oz
Rms = 33.25 lb/s
P-Dia = 18 in
Sd = 254.5 sq.in
Qes = 0.295
Re = 8 ohms
Z = 9.6 ohms
BL = 9.091 lb/A
Pe = 800 watts
Qts = 0.275
no = 3.592 %
1-W SPL = 97.7 dB
2.83-V SPL = 97.7 dB
-----------------------------------------
Box Properties
Name:
Type: Vented Box
Shape: Prism, square
Vb = 3.828 cu.ft
Fb = 25 Hz
QL = 6.387
F3 = 80.84 Hz
Fill = minimal
No. of Vents = 2
Vent shape = round
Vent ends = one flush
Dv = 3 in
Lv = 12.99 in
The box volume is what the software recommended, and did yield the best response. If that is too big, let me know and I can work it smaller and give the choice of response.It has a pretty smooth roll off. I can email you the pdf file that has diagrams, response charts and the cut list for the enclosure pieces, just PM me an email address. Also, take not that the front baffle is 1.5 inches thick. With a large driver like this, I always make a laminated fornt, it's so much stiffer that way. Just glue tow layers of 1.5 MDF to make it. There is also an internal brace 3x18.5.x.75 to span the inner walls.
Obviously measuring your own is best but IMO the published TS parameters in this case seem legit in that they are looking pretty modest. Example: BL²/RE=60.97, if I was the guy making stuff up over there, I'd have at least gave it a pair 😀
Name: PDW18125
Fs = 27.12 Hz
Qms = 2.76
Vas = 437.8 liters
Cms = 205.4 µm/N
Mms = 167.7 g
Rms = 10.35 kg/s
Xmax = 7.5 mm
P-Dia = 394.9 mm
Sd = 1225 sq.cm
P-Vd = 0.919 liters
Qes = 0.468
Re = 6.3 ohms
Le = 2.34 mH per GM
Z = 8 ohms
BL = 19.6 Tm
Qts = 0.4
no = 1.798 %
1-W SPL = 94.69 dB
2.83-V SPL = 95.73 dB
Looks decent in the tapped pipe, should be OK with standard 80hz AVR crossover...
Name: PDW18125
Fs = 27.12 Hz
Qms = 2.76
Vas = 437.8 liters
Cms = 205.4 µm/N
Mms = 167.7 g
Rms = 10.35 kg/s
Xmax = 7.5 mm
P-Dia = 394.9 mm
Sd = 1225 sq.cm
P-Vd = 0.919 liters
Qes = 0.468
Re = 6.3 ohms
Le = 2.34 mH per GM
Z = 8 ohms
BL = 19.6 Tm
Qts = 0.4
no = 1.798 %
1-W SPL = 94.69 dB
2.83-V SPL = 95.73 dB
Looks decent in the tapped pipe, should be OK with standard 80hz AVR crossover...
Code:
ID=29.00
Ang=2.0 x Pi
Eg=2.83
Rg=0.00
Fta=-2.23
S1=2000.00
S2=1905.30
Par=25.00
F12=0.00
S2=1905.30
S3=814.39
Par=288.00
F23=0.00
S3=814.39
S4=750.00
Par=17.00
F34=0.00
S4=0.00
S5=0.00
L45=0.00
F45=0.00
Sd=1225.00
Bl=19.63
Cms=2.05E-04
Rms=10.37
Mmd=143.34
Le=2.34
Re=6.30
TH=1
Vrc=0.00
Lrc=0.00
Ap1=0.00
Lpt=0.00
Vtc=0.00
Atc=0.00
Pmax=100
Xmax=5.0
Comment=PDW18125
- Status
- Not open for further replies.