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Old 21st December 2012, 02:51 AM   #491
toobhed is offline toobhed  United States
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Join Date: Jun 2010
Hi JHutka,
No, I used the same dimensions for the 4" as Bjorn posted for the 3"....sounds great!
Mario
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Old 21st December 2012, 07:34 AM   #492
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Location: Bombay [aka Mumbai]
Hi Bjorn: In India we are starved for speaker drivers but I have found a local manufacturer [http://www.iwaispeakers.com] and they seem to have a promising FR driver which might work well in the TABAQ:

4" Driver
Nominal Impedance 8 Ohms
Resonance Frequency 110 Hz
Power Handling {IEC-268-5C} 25 Watt
Long Term Power {IEC-268-5L} 75 Watt
Short Term Power {IEC-268-5S} 125 Watt
Sensitivity (2.83V/1m) 90 dB
Resistance (DC) 5.5 Ω
Qts 0.81
BL 3.8 T-M
VAS 1.44 Liters

Can I please request you to simulate this and see if this would work in a folded T-L?

Thanks! in advance.

-\keith

Last edited by keith_correa; 21st December 2012 at 07:41 AM.
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Old 21st December 2012, 11:48 AM   #493
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Join Date: Jan 2009
Location: Bombay [aka Mumbai]
Quote:
Originally Posted by keith_correa View Post
Hi Bjorn: In India we are starved for speaker drivers but I have found a local manufacturer [http://www.iwaispeakers.com] and they seem to have a promising FR driver which might work well in the TABAQ:

4" Driver
Nominal Impedance 8 Ohms
Resonance Frequency 110 Hz
Power Handling {IEC-268-5C} 25 Watt
Long Term Power {IEC-268-5L} 75 Watt
Short Term Power {IEC-268-5S} 125 Watt
Sensitivity (2.83V/1m) 90 dB
Resistance (DC) 5.5 Ω
Qts 0.81
BL 3.8 T-M
VAS 1.44 Liters

Can I please request you to simulate this and see if this would work in a folded T-L?

Thanks! in advance.

-\keith
Got revised parameters for the driver from the manufacturer:
Nominal Impedance: 8 Ohms
Resonance Frequency: 100 Hz
Power Handling {IEC-268-5C}: 25 Watt
Long Term Power {IEC-268-5L}: 75 Watt
Short Term Power {IEC-268-5S}: 125 Watt
Sensitivity (2.83V/1m): 88 dB
Resistance (DC): 7.4 Ω
Qms: 2.81
Qes: 0.85
Qts: 0.65
BL: 4.69 T-M
VAS: 3.18 Liters
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Old 21st December 2012, 11:56 AM   #494
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Location: Copenhagen
Hi Keith,

do you have the cone area Sd ? And maybe also Lh (mH).
First impression si that this would work, but I will simulate it.

Hi from
Bjorn
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Old 21st December 2012, 12:19 PM   #495
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Location: Bombay [aka Mumbai]
Bjorn: they have not given this on their website but I will mail and ask. Thanks!
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Old 22nd December 2012, 10:02 AM   #496
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Location: Germany
Hi Keith,

I just had a look the freq-range of this driver on the iwai-website. You shouldn't expect too much from it at >8kHz. From the picture and the measures the sd should be around 51-55 cm². To me it looks more like a midwoofer than a fullrange-speaker.
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Old 25th December 2012, 11:22 AM   #497
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Location: Copenhagen
Default IWAI in TABAQ

Hi Keith

I agree with kNOPFLER, this is not a full range driver.

If you put it into TABAQ you will experience a week bass - and no high treble as you can see on the manufactures webpage.

For your information I have attached the simulation of the IWAI driver in TABAQ.

Happay X-mas from
Bjorn
Attached Images
File Type: jpg IWAI.jpg (45.9 KB, 573 views)
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Old 25th December 2012, 01:34 PM   #498
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Location: Bombay [aka Mumbai]
Thanks Bjorn. Merry Christmas to you and all here.
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Old 27th December 2012, 06:18 AM   #499
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Location: Bombay [aka Mumbai]
Hi Bjorn:

I got all the measured parameters from the manufacturer. Also some graphs. Have attached them. Do your simulations with this data still show that this may not work well?

In advance, Thanks!

-\keith
Attached Images
File Type: jpg SPL&IMP-Sample# 1646.jpg (147.7 KB, 545 views)
Attached Files
File Type: txt TSP Sample #1646-1.txt (779 Bytes, 5 views)
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Old 27th December 2012, 10:09 AM   #500
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Join Date: Jan 2005
Location: Copenhagen
Hi Keith this will not change the sim.

You could try less stuffing - like 70 gram and no baffle step filter.
As you can see the driver frequency is dropping in the high end and would need help from a tweeter.

Build one and see what you think.

Hi from
Bjorn
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