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Hello,
Would the MCM 55-1880 15" woofers be a good choice for a Econowave project? I have the QSC waveguides and will be ordering up some Radian 475PB drivers. These look like they would be a good choice but I came to ask my fellow AA brothers who have actually built the Econowaves and others that have actually used this MCM woofer. this woofer seems more like a 16" woofer than a 15". I was looking to xover at 1200hz and wanted to order the Parts-Express Knock Down 2 way Pro cabs for this project also.
here's the specs below for the MCM woofer:
•Rigid paper cone
•Treated cloth accordion surround
•Die cast basket
•4" voice coil
•100oz. magnet
Specifications::
•Power Capacity: 400W/800W RMS/peak
•Sensitivity: 98dB (W/M)
•Impedance: 8ohm
•Re: 6.6ohm
•Le: 1.2mH
•Frequency response: 26Hz~3500Hz
•Fs: 28Hz
•Qts: 0.23
•Qes: 0.27
•Qms: 1.46
•Vas: 463 (liters)
•Xmax: 4.4mm
Dimensions:
•Overall frame diameter: 15.75"
•Required cutout: 14.63"
•Mounting depth: 5"
any help would be greatly appreciated!
Thanks
Follow Ups:
Hello all,
I know it's been a while since I posted on this project and things have come up that have kept setting me be back on the start of this project.
This week I finally got around to starting this project. I first built a 1st order Xover with the xover point at 1.5khz. I know this may be a little on the high side for this MCM 55-1880 woofer but as far as the specs and winISD software it seemed it would be ok. but this isn't going to be the final xover anyways so the Xover point will change. So far so good with the 1st order Xover.
I installed the Dayton D250P on the QSC CD horn and was breaking it in for 2 days. Today I made (don't laugh) a Box made from heavy thick cardboard for just a rough draft BOX for the MCM 55-1880 since it was the size that was suggested by winISD. I didn't want to be cutting wood/MDF board and it not work out. That's too much time and wood since I have not much time I thought this would be the fastest and more easy on the wallet.
I put the woofer in and set up the QSC horn top and let it go! At First there was almost zero hint of bass but that was due to the woofer being so stiff but after a few hours the bass started to come in little by little.
After 4 hours the speaker is starting to have some of that magic the horns in a 2 way system have. It kind of reminds me of my Altec Model 14's I used to have. So far I have been taking it easy on them but will try to do some serious listening tomorrow.
This week I will start building the Z19 Xover that was planned for this project to begin with and hopefully I will have it done by the end of the week. Then I can get a more better idea of what this project will come out sounding like. So far I really like the direction this project with the 1st order Xover is going. I have the Dayton D250P/QSC horn cap parts are Solen the Duelund Alexander caps I left over from the Aikido preamp (that still isn't done yet). Those Alexander caps are really nice and I strongly recommend them on the HF portion of the xover.
I will try to post back later next week with another update.
Thank everyone!
These are heavy nice looking woofers. Very stiff but the will need break in still. Hope they work out, if not will use them in a different configuration. Now all I need is the Radian 475PB drivers or I may try the Dayton D250P driver with the QSC waveguide. Just a few more parts and I'm ready to roll! :)
How are those 55-1880s working out? Any problems? JH
I have my Counterpoint SA-12 that has been upgraded to an SA-100 and restored on the way back to me from Green Street Audio. So I had to hold off on the speaker build. but I will be getting the CD's soon and I will post back as I start the build and finish the speakers.
I've had one laying around for a decade - think its made by Tangband
#90
freddi is invisible freddi United States
diyAudio Member
Join Date: Aug 2005
- got an 1880 buried somewhere in my pile - - not looked at it for ~5 years - Fs seemed ~1/2 octave higher than spec but it wasn't run-in hard but do remember running it at 20vrms in a Karlson -IIRC Sd looked lower than some 15 and unit made by Tangband. -didn't' sound special in K15 - I thought this unit was discontinued (?)
AH - here's its basic Q's - I think somehow MCM confused it with something else -? its pretty much anti-Altec
;================================================= =================
; Woofer Tester 2 Log File: 55-1880_Try1.log
;------------------------------------------------------------------
; 55-1880
;================================================= =================
;================================================= =================
Calibration test completed: Tue Apr 26 19:11:30 2005
Calibration drive current 3181.82 uA
;------------------------------------------------------------------
Calibration R = 10.000 ohms
Cable Resistance = 0.196 ohms
Cable Inductance = 0.000 micro-h
KResist = 1.015490 ohms/ohm
(internal R= = 223.408 ohms)
KPhase = -1.882435 microrads/Hz
;================================================= =================
;================================================= =================
Q test completed: Fri Apr 29 18:06:00 2005
Q drive current 3181.82 uA
;------------------------------------------------------------------
Revc= 6.5807 ohms
Fs = 38.1263 Hz
Zmax= 35.3349 ohms
Ro = 15.2489 ohms
F0 = 21.9715 Hz
F1 = 61.3508 Hz
Fmin= 182.9694 Hz
Qms = 2.2435
Qes = 0.5134
Qts = 0.4178
Le = 1.3208 mH @1kHz
XLe = 14.7362 impedance @1kHz
PLe = 34.2748 phase @1kHz
;------------------------------------------------------------------
Vas test completed: Fri Apr 29 18:18:28 2005
Vas drive current 3181.82 uA
;------------------------------------------------------------------
Revc = 6.5807 ohms
Fs = 38.1263 Hz
Zmax = 35.3349 ohms
Qes = 0.5134
Qms = 2.2435
Qts = 0.4178
Le = 1.3208 mH (at 1 kHz)
Diam = 308.0000 mm ( 12.1260 in )
ConeArea =74506.0071 mm^2(115.4845 in^2)
Vas = 175.6643 L ( 6.2035 ft^3)
BL = 15.4098 N/A
Mms = 77.3410 g
Cms = 225.3101 uM/N
Kms = 4438.3267 N/M
Rms = 8.2583 R mechanical
Efficiency = 1.8279 %
Sensitivity= 94.6194 dB @1W/1m
Sensitivity= 95.4676 dB @2.83Vrms/1m
;------------------------------------------------------------------
; When testing drivers with an up/down radiation (cone motion)
; enough weight should be used to get a decent resonance change
; without significantly altering the drivers suspension zero point.
; A typically good configuration is when Fs/Fsa=1.25.
; Horizontally mounted drivers are less susceptable but require
; a clay or soft caulk mass. The following may be of help
;------------------------------------------------------------------
Fs= 38.1263 Mms = 77.3410 g
Fsa= 29.4823 Mms+Ma=129.3410 g
Fs/Fsa = 1.2932
Ideal Test Mass = 43.5043 g
Test Mass used = 52.0000 g
Missed ideal by = 8.4957 g (too heavy)
Nickels used = 10.4000
Nickels desired = 8.7009
;-------------------------------------
Last edited by freddi; 4th August 2010 at 09:55 PM
Karlson Evangelist
MCM woofers seldom come even close to their published specs.
I would look at the Dayton Audio PA380-8 15" Pro Woofer first.
Hi djk,
I was thinking about the Daytons too but I have seen some reviews about it sounding muddy so that kinda changed my mind. Hopefully the these MCM 15's will be closer to the specs. I have seen some good reviews on them. I wish Dayton still made the older Dayton Pro 15" those were nice!
I had those Dayton pro 15's in my jbl c550 bass horn diy copies. They sounded great. Nothing muddy about there sound. But there sensitivity was a little lower then spec'ed.
They do start to roll off around 50hz though. But for there price there hard to beat.
Nick
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