Looking for 55-1875 MCM 18" woofer box design

lXxAndyxXl · 22nd September 2004, 04:06 AM

Can anyone help me i am looking for a 55-1875 MCM 18" woofer box design. http://mcm.newark.com/NewarkWebComme...KU=55-1875&N=4 .

Thanxs

Hornlover · 22nd September 2004, 05:44 PM

It would help if they gave T/S parameters for it. Without those, its a guess. All I can tell from the photo is that its made by Eminence.

lXxAndyxXl · 22nd September 2004, 09:08 PM

Sry bout that its the first one the 55-1875.
http://www.newark.com/product-detail...o_speakers.pdf
.

Thanxs

Tim Moorman · 23rd September 2004, 01:57 AM

Email MCM tech support and they usually follow up the next day with the TS parameters.

Tim

Leonrocksnrolz · 23rd September 2004, 02:10 AM

Driver Properties
Name: 55-1875
Type: Standard one-way driver
Company: MCM Electronics
No. of Drivers = 1
Fs = 31 Hz
Qms = 2.193
Vas = 404.9 liters
Cms = 0.171 mm/N
Mms = 154.2 g
Rms = 13.7 kg/s
Xmax = 4.4 mm
Xmech = 6.6 mm
P-Dia = 405.5 mm
Sd = 1292 sq.cm
P-Vd = 0.568 liters
Qes = 0.46
Re = 6.8 ohms
Z = 8 ohms
BL = 21.07 Tm
Pe = 400 watts
Qts = 0.38
no = 2.528 %
1-W SPL = 96.18 dB
2.83-V SPL = 98 dB
-----------------------------------------

Hornlover · 23rd September 2004, 03:57 PM

For a max. flat alignment, it would be 13.34 ft3 for an F3 of 31.2 Hz. In a 6th order alignment, it would be 8.46 ft3 for an F3 of 24.5 Hz.
Both of these are fairly large boxes for what you get. For info on 6th order alignments, and drivers that will give the same or lower F3's in smaller boxes, go here and check out the downloads/enclosures page.

www.highefficiencyloudspeakers.com

lXxAndyxXl · 27th September 2004, 06:07 PM

what about the port hole. If i want the length to be 3/4 in. What would the diameter of the port be?

Hornlover · 28th September 2004, 03:32 PM

Check here:

www.highefficiencyloudspeakers.com

Go to the downloads page, and read the article on alignments. It gives you the formulas to calculate port sizes, at the end of the article.

22nd September 2004, 04:06 AM	#1
lXxAndyxXl diyAudio Member Join Date: Sep 2004 Location: New Mexico	Looking for 55-1875 MCM 18" woofer box design Can anyone help me i am looking for a 55-1875 MCM 18" woofer box design. http://mcm.newark.com/NewarkWebComme...KU=55-1875&N=4 . Thanxs

22nd September 2004, 09:08 PM	#3
lXxAndyxXl diyAudio Member Join Date: Sep 2004 Location: New Mexico	for got to put information Sry bout that its the first one the 55-1875. http://www.newark.com/product-detail...o_speakers.pdf . Thanxs

23rd September 2004, 01:57 AM	#4
Tim Moorman diyAudio Member Join Date: Nov 2002 Location: Indiana	Tech Support Email MCM tech support and they usually follow up the next day with the TS parameters. Tim

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22nd September 2004, 05:44 PM	#2
Hornlover diyAudio Member Join Date: Sep 2004 Location: Central California	It would help if they gave T/S parameters for it. Without those, its a guess. All I can tell from the photo is that its made by Eminence.

23rd September 2004, 02:10 AM	#5
Leonrocksnrolz diyAudio Member Join Date: Sep 2004 Location: Sydney	Driver Properties Name: 55-1875 Type: Standard one-way driver Company: MCM Electronics No. of Drivers = 1 Fs = 31 Hz Qms = 2.193 Vas = 404.9 liters Cms = 0.171 mm/N Mms = 154.2 g Rms = 13.7 kg/s Xmax = 4.4 mm Xmech = 6.6 mm P-Dia = 405.5 mm Sd = 1292 sq.cm P-Vd = 0.568 liters Qes = 0.46 Re = 6.8 ohms Z = 8 ohms BL = 21.07 Tm Pe = 400 watts Qts = 0.38 no = 2.528 % 1-W SPL = 96.18 dB 2.83-V SPL = 98 dB -----------------------------------------

23rd September 2004, 03:57 PM	#6
Hornlover diyAudio Member Join Date: Sep 2004 Location: Central California	For a max. flat alignment, it would be 13.34 ft3 for an F3 of 31.2 Hz. In a 6th order alignment, it would be 8.46 ft3 for an F3 of 24.5 Hz. Both of these are fairly large boxes for what you get. For info on 6th order alignments, and drivers that will give the same or lower F3's in smaller boxes, go here and check out the downloads/enclosures page. www.highefficiencyloudspeakers.com

27th September 2004, 06:07 PM	#7
lXxAndyxXl diyAudio Member Join Date: Sep 2004 Location: New Mexico	what about the port hole. If i want the length to be 3/4 in. What would the diameter of the port be?

28th September 2004, 03:32 PM	#8
Hornlover diyAudio Member Join Date: Sep 2004 Location: Central California	Check here: www.highefficiencyloudspeakers.com Go to the downloads page, and read the article on alignments. It gives you the formulas to calculate port sizes, at the end of the article.

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