zobsky contemplates a variation on the belle klipsch - diyAudio
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Old 1st February 2015, 07:26 AM   #1
zobsky is offline zobsky  India
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Default zobsky contemplates a variation on the belle klipsch

For a little while now, I've considered building a variation of the lascala / belle klipsch . This post mostly concerns the bass bin design of the belle.

For your reference, I've attached the standard plans for a belle klipsch .

1. From these plans, I've attempted to simulate the response of a belle klipsch running an eminence kappa 15c with the DJK ported mod on the front baffle (see pic). From the sims, it looks like I don't really need to add a riser (the riser mod adds more deep bass, though at lower SPL - this level can be lifted via an EQ boost). I can live with a solid 50 Hz and implement a sub to take care of the first 1.5 octaves . Regardless. I've added an arbitrary "underbelly" to my rendering that can be increased if needed.

Thoughts on my analysis of the EQ mod (I used the stock rear chamber volume of about 68 liters (65 liters + 3 liters I intend to use by cutting into the dead space enclosed by the 2 V, the rear of the enclosure and the motorboard)?
Attached Images
File Type: png klipsch_belle.png (211.6 KB, 374 views)
File Type: png belle_hr_input.PNG (36.0 KB, 373 views)
File Type: png belle_Response.PNG (36.9 KB, 361 views)
File Type: png klipsch_belle_wire.png (87.4 KB, 365 views)
Attached Files
File Type: pdf Belle_LATEST.pdf (99.5 KB, 45 views)
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Last edited by zobsky; 1st February 2015 at 07:31 AM.
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Old 1st February 2015, 07:35 AM   #2
zobsky is offline zobsky  India
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Also, A few weeks ago, I inquired about the possibility of using multiple drivers in push pull ( see Push pull vs single driver for bass horn ) . That's a possibility for this project, once I'm assured mmy current proposal is feasible.

Another wild thought I've had is to implement a paraline (without a horn extension) with a few suitable midranges and a compression driver on the board with the ports (and completely dispensing with the upper horn section). Thoughts ?
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Old 1st February 2015, 07:46 AM   #3
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Quote:
Originally Posted by zobsky View Post
Also, A few weeks ago,
A few centuries ago there were experimentations about the adiabatic theorem and Bernoulli's principle
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Old 1st February 2015, 07:51 AM   #4
zobsky is offline zobsky  India
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For reference, here is a comparison of the standard response of the belle (in black) vs the chosen port (in light grey)
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File Type: png ported-vs-not.PNG (60.0 KB, 354 views)
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Old 1st February 2015, 07:41 PM   #5
zobsky is offline zobsky  India
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Looking at the detail of the motorbikes, the driver fires into a 3" x 13" which is immediately bifurcated into two 3" x 13" throats . Shouldn't the first throat be nominally 6" x 13", or is there something else going on?

Thanks
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Old 1st February 2015, 08:41 PM   #6
DrBoar is offline DrBoar  Sweden
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The odd constriction is supposed to do with path length differences and such and improves the upper end of the horn.The bass highpass do look early. Have you tried reducing the camber volume by 2/3 or so? I tried several drivers in a horn similar to the La Scala and the bass was deeper with mid Q drivers (0.4 or so) so try running a simulation with a cheaper driver! You should get the horn down to 60 Hz without ports.
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Old 1st February 2015, 09:39 PM   #7
zobsky is offline zobsky  India
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Will try so and report back
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Old 1st February 2015, 11:29 PM   #8
freddi is offline freddi  United States
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I'm not sure how well the rubber throat works. With the stock Peavey woofer, here's what my FH1 did in ~2pi conditions . FH1 was about the same frontal size as Belle but 2 feet deep. A Belle knockoff could probably come from one 4' x 8' sheet. (that would be cool if XRK971 made one of pink foam board)

Click the image to open in full size.
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Old 2nd February 2015, 03:44 AM   #9
zobsky is offline zobsky  India
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Here's the response with a somewhat less powerful woofer, the community 110470

Code:
Nominal Diameter15"Power Handling (RMS)200 Watts
Power Handling (max)400 WattsImpedance4 ohms
Frequency Response40 to 5,000 HzSensitivity97.91 dB 1W/1m
Voice Coil Diameter2.38"
THIELE-SMALL PARAMETERS
Resonant Frequency (Fs)39.03 HzDC Resistance (Re)2.29 ohms
Voice Coil Inductance (Le)0.83 mHMechanical Q (Qms)4.62
Electromagnetic Q (Qes)0.43Total Q (Qts)0.40
Compliance Equivalent Volume (Vas)10.26 ft.≥Mechanical Compliance of Suspension (Cms)0.25 mm/N
Diaphragm Mass Inc. Airload (Mms)65.47gMaximum Linear Excursion (Xmax)2.50 mm
Not too shabby for a sealed rear chamber though I can't speculate how this will sound subjectively compared to woofers with more powerful motors. The FAQ on parts express implied that this cone might not be beefy enough to handle the high throat compression ration.

Increasing / decreasing the rear chamber size does alter the response somewhat in either direction. I'll experiment with some other drivers
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File Type: png community.png (73.7 KB, 63 views)
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Old 2nd February 2015, 03:53 AM   #10
zobsky is offline zobsky  India
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Here's my sketchup model in case any one else needs / wants it
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File Type: zip klipsch_belle.zip (154.2 KB, 35 views)
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