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Building my first Belle


longdrive03

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It isn't the 15C but the numbers on it are 11-15 -04  Here are the specs I measured.

 

 


Buffer[1] Vas                                                       Ver 7.01     

Completed: Sun Nov 09 21:57:31 2014

Drive level 69.504% [2.465 mA]

Sine,LoZP(LV/LA)->Vas,21 pts

;------------------------------------------------------------------

Re         =      4.9895 ohms

Fs         =     30.0773 Hz

Zmax       =    114.3375 ohms

Qes        =      0.3160

Qms        =      6.9247

Qts        =      0.3022

Le         =      3.6119 mH  (at 1 kHz)

Diam       =    336.5500 mm  ( 13.2500 in  )

Sd         =  88958.8296 mm^2(137.8865 in^2)

Vas        =    289.3886 L   ( 10.2197 ft^3)

BL         =     18.0167 N/A

Mms        =    108.7740 g

Cms        =    257.4179 uM/N

Kms        =   3884.7336 N/M

Rms        =      2.9685 R mechanical

Efficiency =      2.3415 % 

Sensitivity=     95.7130 dB @1W/1m

Sensitivity=     97.7634 dB @2.83Vrms/1m

Krm        =   8.289E-03 ohms     Freq dependent resistance

Erm        = 808.551E-03          Rem=Krm*(2*pi*f)^Erm

Kxm        =  63.176E-03 Henries  Freq dependent reactance 

Exm        = 677.122E-03          Xem=Kxm*(2*pi*f)^Exm

;------------------------------------------------------------------

Ftest                   =    21.975 Hz

Ftest/Fms               =    0.7306

Test Mass used          =   95.0000 g (Equal to 19.0 nickels)

Test Mass (Ft=Fms*0.90) =    25.515 g (Add -69.485g for Ft=27.070)

Test Mass (Ft=Fms*0.75) =    84.602 g (Add -10.398g for Ft=22.558)

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  • 2 weeks later...

It isn't the 15C but the numbers on it are 11-15 -04  Here are the specs I measured.

 

 


Buffer[1] Vas                                                       Ver 7.01     

Completed: Sun Nov 09 21:57:31 2014

Drive level 69.504% [2.465 mA]

Sine,LoZP(LV/LA)->Vas,21 pts

;------------------------------------------------------------------

Re         =      4.9895 ohms

Fs         =     30.0773 Hz

Zmax       =    114.3375 ohms

Qes        =      0.3160

Qms        =      6.9247

Qts        =      0.3022

Le         =      3.6119 mH  (at 1 kHz)

Diam       =    336.5500 mm  ( 13.2500 in  )

Sd         =  88958.8296 mm^2(137.8865 in^2)

Vas        =    289.3886 L   ( 10.2197 ft^3)

BL         =     18.0167 N/A

Mms        =    108.7740 g

Cms        =    257.4179 uM/N

Kms        =   3884.7336 N/M

Rms        =      2.9685 R mechanical

Efficiency =      2.3415 % 

Sensitivity=     95.7130 dB @1W/1m

Sensitivity=     97.7634 dB @2.83Vrms/1m

Krm        =   8.289E-03 ohms     Freq dependent resistance

Erm        = 808.551E-03          Rem=Krm*(2*pi*f)^Erm

Kxm        =  63.176E-03 Henries  Freq dependent reactance 

Exm        = 677.122E-03          Xem=Kxm*(2*pi*f)^Exm

;------------------------------------------------------------------

Ftest                   =    21.975 Hz

Ftest/Fms               =    0.7306

Test Mass used          =   95.0000 g (Equal to 19.0 nickels)

Test Mass (Ft=Fms*0.90) =    25.515 g (Add -69.485g for Ft=27.070)

Test Mass (Ft=Fms*0.75) =    84.602 g (Add -10.398g for Ft=22.558)

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Update.  Got the bass bin put together and veneering now.  Pics show the front before the veneer was attached to the sides and top which are now still clamping.  Should unclamp tonight.  One picture is the back which I veneered as well.

 

I have all the parts cut out for the second bin and should start that later in the week.  Can't wait to hear some sound with the K33 and EV SM120A horn and different drivers!

IMG_5440.JPG

IMG_5453.JPG

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UpdIt isn't the 15C but the numbers on it are 11-15 -04  Here are the specs I measured.

 

 


Buffer[1] Vas                                                       Ver 7.01     

Completed: Sun Nov 09 21:57:31 2014

Drive level 69.504% [2.465 mA]

Sine,LoZP(LV/LA)->Vas,21 pts

;------------------------------------------------------------------

Re         =      4.9895 ohms

Fs         =     30.0773 Hz

Zmax       =    114.3375 ohms

Qes        =      0.3160

Qms        =      6.9247

Qts        =      0.3022

Le         =      3.6119 mH  (at 1 kHz)

Diam       =    336.5500 mm  ( 13.2500 in  )

Sd         =  88958.8296 mm^2(137.8865 in^2)

Vas        =    289.3886 L   ( 10.2197 ft^3)

BL         =     18.0167 N/A

Mms        =    108.7740 g

Cms        =    257.4179 uM/N

Kms        =   3884.7336 N/M

Rms        =      2.9685 R mechanical

Efficiency =      2.3415 % 

Sensitivity=     95.7130 dB @1W/1m

Sensitivity=     97.7634 dB @2.83Vrms/1m

Krm        =   8.289E-03 ohms     Freq dependent resistance

Erm        = 808.551E-03          Rem=Krm*(2*pi*f)^Erm

Kxm        =  63.176E-03 Henries  Freq dependent reactance 

Exm        = 677.122E-03          Xem=Kxm*(2*pi*f)^Exm

;------------------------------------------------------------------

Ftest                   =    21.975 Hz

Ftest/Fms               =    0.7306

Test Mass used          =   95.0000 g (Equal to 19.0 nickels)

Test Mass (Ft=Fms*0.90) =    25.515 g (Add -69.485g for Ft=27.070)

Test Mass (Ft=Fms*0.75) =    84.602 g (Add -10.398g for Ft=22.558)

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UpdIt isn't the 15C but the numbers on it are 11-15 -04  Here are the specs I measured.

 

 


Buffer[1] Vas                                                       Ver 7.01     

Completed: Sun Nov 09 21:57:31 2014

Drive level 69.504% [2.465 mA]

Sine,LoZP(LV/LA)->Vas,21 pts

;------------------------------------------------------------------

Re         =      4.9895 ohms

Fs         =     30.0773 Hz

Zmax       =    114.3375 ohms

Qes        =      0.3160

Qms        =      6.9247

Qts        =      0.3022

Le         =      3.6119 mH  (at 1 kHz)

Diam       =    336.5500 mm  ( 13.2500 in  )

Sd         =  88958.8296 mm^2(137.8865 in^2)

Vas        =    289.3886 L   ( 10.2197 ft^3)

BL         =     18.0167 N/A

Mms        =    108.7740 g

Cms        =    257.4179 uM/N

Kms        =   3884.7336 N/M

Rms        =      2.9685 R mechanical

Efficiency =      2.3415 % 

Sensitivity=     95.7130 dB @1W/1m

Sensitivity=     97.7634 dB @2.83Vrms/1m

Krm        =   8.289E-03 ohms     Freq dependent resistance

Erm        = 808.551E-03          Rem=Krm*(2*pi*f)^Erm

Kxm        =  63.176E-03 Henries  Freq dependent reactance 

Exm        = 677.122E-03          Xem=Kxm*(2*pi*f)^Exm

;------------------------------------------------------------------

Ftest                   =    21.975 Hz

Ftest/Fms               =    0.7306

Test Mass used          =   95.0000 g (Equal to 19.0 nickels)

Test Mass (Ft=Fms*0.90) =    25.515 g (Add -69.485g for Ft=27.070)

Test Mass (Ft=Fms*0.75) =    84.602 g (Add -10.398g for Ft=22.558)

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AVGUY,  this is one of the very satisfying but sometimes pain in the butt builds.  I think the second cabinet will be much easier not that I have figured out the construction order.  Big tip is to cut all the parts that share a common dimension at the same time.  I've got 3/4" mdf and plywood along with the 1.25" plywood sides so the front edge trimming with solid cherry will be a little different.  I'm thinking I'll go with the Kappa 15C woofer and see how those sound with the EV SM120A horns and yet to be decided upon driver (not sure if I'll settle on two or three way).  Do you have to components for the build?  

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Update.  Got one bass bin built and installed the Eminence 15"  woofer which is physically impressive.  Here are the WT2 test results and a pic of the woofer on the left next to the K-33.

 

This is a cast frame monster with a 3" vc and huge spider.  Sounds good right now sitting on my portable work bench.  Tonight I'll connect the EV ND6X driver to the EV SM120A horn and a temporary crossover to see how it sounds.  I'll post cabinet pics below.

15 INCH EMINENCE SAMPLE WOOFER 1.docx

IMG_5583.JPG

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1 hour ago, longdrive03 said:

Right now I'm running the woofer wire out the bottom since I might do the DJK ported base arrangement.

For what it's worth, here are comparative measurements I took last weekend for a stock vs ported belle bass bin  with eminence kappa 15c

 

belle_ported_compare.png

Subjectively, I can't hear much of a difference.  The sound is a bit more solid but it's not night and day

I'm not sure what the deal is with the  dip at 50 Hz. It's either a room mode or the port is working way below where the horn gives up, .. leading to a discontinuity. I tried all manner of EQ and boost etc but really , the addition of ports doesn't give this speaker "wings" :)

 

OTOH, the fact that the port cuts down on the 150 Hz peak does help somewhat, IMO .

I used two 4.5" DIA ports of length 6" each. Not exactly the specified recipe but close enough. I could always lengthen the ports (these are parts express telescoping ports). If anything, I would think that SHORTENING the ports might move the resonance up to meet with the horn rolloff

t

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longdrive03 - your assembly and veneer are world class beautiful !   Zobsky - that's a real nice graph - the dip has to be the room pulling on the curve.   Bifurcated horns with their symmetry are prettier (with wood - not FH!) than single mouth variety , and the Belle with its proportions and flat section between the mouths, even nicer perhaps than a nice La Scala.  The omission of mouth braces is the aesthetic icing on the cake,

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Guys, thanks for the compliments.  

 

Zobsky, I'm using the heatlock glue iron on method with edge clamping overnight.  The veneer I'm using is aircraft grade veneer and almost 1/16" thick with wood backing.   The side panels are 1 3/8" (1/8" for the inner and outer veneer panels. 

 

I haven't used contact cement because we know when it touches it is stuck.  However, you probably get a better bond and probably don't need to clamp.

 

Rich, I could be persuaded!!  These don't have a home yet.  

 

I hooked up the horn and ND6X  driver last night crossed at 500hz and was impressed.  These things are too heavy to put on the floor right now.  Had them on my mobile workbench 3 feet off the concrete floor.  Still good solid bass.  Here are some pics. The ND6X is impressive.  First time I've heard one.   

IMG_5639.JPG

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