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Old 27th December 2012, 10:09 AM   #501
xrk971 is offline xrk971  United States
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This driver falls off rather fast after 10 khz but has usable power levels if you are not tweeter fanatic and don't mind the muted highs. It is quite nice below 10 khz though. If it went at least to 14 or 15 khz that would not be as bad as much can still be heard treble wise if that were the case. You can easily test if the high end is sufficient for your taste by listening to them without a tabaq box - just mounted open baffle into a piece of large cardboard to get some semblance of bass, and as the highs don't require an enclosure. If it sounds lacking in the treble department, it will only get worse when the bass end is strengthened with the tabaq enclosure.
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Old 27th December 2012, 10:55 AM   #502
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Good comment, xrk971 !
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Old 28th December 2012, 05:15 AM   #503
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Thanks all!
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Old 4th February 2013, 12:08 PM   #504
dzwer is offline dzwer  Bulgaria
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Default Help with Pioneer TS-E1076 car drivers

Please, someone with free time and willing to help to make calculations for this project with these car drivers with measured parameters:
Driver: Pioneer TS-E1076_1
Compliance (Vas) 1.065 liters
Resonance (Fs) 131.515 Hz
Mechanical Q (Qms) 5.990
Electrical Q (Qes) 1.089
Total Q (Qts) 0.922
DC Resistance (Re) 3.187 Ohms
Piston Area (SD**2) 50.000 sq cm

Driver: Pioneer TS-E1076_2
Compliance (Vas) 1.055 liters
Resonance (Fs) 131.512 Hz
Mechanical Q (Qms) 6.000
Electrical Q (Qes) 1.087
Total Q (Qts) 0.920
DC Resistance (Re) 3.198 Ohms
Piston Area (SD**2) 50.000 sq cm

avtozvuk.com - in Russian
TS-E1076 (Archived) - Pioneer UK
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Old 4th February 2013, 05:07 PM   #505
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I wouldn't with an Fs that high; the theoretical absolute minimum Fb that could be done is 71.476Hz, and even then it's likely to be begging for mercy. You can do it, you might even get lower, but sound quality goes out of the window as HD etc. rockets.
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Old 4th February 2013, 05:38 PM   #506
dzwer is offline dzwer  Bulgaria
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75-80Hz is OK.
I don't expect they go any lower than 70Hz.
Can you make the calculations?
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Old 4th February 2013, 05:40 PM   #507
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I can, but time doesn't permit at this second. If I get a few minutes later tonight I'll take a gander at it.
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Old 13th March 2013, 07:42 AM   #508
dzwer is offline dzwer  Bulgaria
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Any help?
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Old 13th March 2013, 08:29 AM   #509
xrk971 is offline xrk971  United States
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Default Accidental MLTL Technique

Dzwer,
In situations where you cannot get a full sim of your driver with a MLTL, but would like something that may work, try this. It has worked for me on two occasions already and maybe I was lucky... I call it the "Accidental MLTL" technique.

Use WinISD bass reflex software (free) and plug in your driver's T/S params and design a vented bass reflex speaker enclosure using the default optimal case. That will give you the volume of the box and the vent cross sectional area and length.

Now choose a maximum length you are willing to have based on practical size constraints, typically 30 inches to 40 inches long. This will correspond to a quarter wave length that is probably higher than the tuning freq of the bass reflex design that came out of WinISD (circa 60 to 75 Hz).

Calculate the cross sectional area (csa) of the transmission line using volume from WinISD and the length you set. If the csa is bigger than you prefer, you can go off the optimal case by going back to WinISD and adjusting the box volume manually to a smaller value and tweaking the frequency even. You can play with the vent to get it to a diam and length you like. Typically, I do this because the default vent is not very practical. Then use new box volume and vent dimensions to calculate the new csa based in length of the line again.

Now build the enclosure with the csa and length and put a vent with dimensions from WinISD at the distal end. On the closed end, measure 1/3 of distance down and make cutout for driver and mount it there. Put polyfill stuffing from closed end to about half to 2/3 of the way down the line. Adjust this to taste, less stuffing gets more boomy bass. More stuffing gets tighter bass at expense of amplitude. I have found that the position of the driver need not be exactly at 2/3 and indeed can even be at the closed end.

Doing this approach will guarantee that at worst, the speaker will perform as a bass reflex optimized for volume and vent size. But if physics of a MLTL and quarter wave theory kick in, you will end up with a speaker that has deeper bass extension than predicted by WinISD. The speakers that I have built following this recipe have measured very well when I look at what is coming from the bass port - typically, I get the low frequency extended or 'pulled down' by an additional 15 Hz from the plain bass reflex prediction. The speakers also sound great - very balanced when the bass port output integrates with the direct radiation from the driver.

If you want to experiment without investing too much in wood, use foam core to build quick and dirty speaker. Even cardboard can be used as a test speaker for this.
Good luck.

Last edited by xrk971; 13th March 2013 at 08:44 AM.
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Old 13th March 2013, 09:39 AM   #510
dzwer is offline dzwer  Bulgaria
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Thanks for the technique!
I'll try it!
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