Hello everyone.
First, sorry for my probably not very good english.
I have 2 different DVC drivers for different subwoofer/bass speaker projects (Ciare HSG200-44 and Ciare HSB320-44). I simmed only dividing Re by 4 but i just read that Bl also has to be divided (by 2).
However i still don't know how to sim with 2 separate amps as the BL apparently also has to be divided by 2 (same for Re) which doesn't match with Qes.
Btw, I have to say i still have doubts as many 4ohm drivers often have close Bl characteristics to the 8ohm models (for drivers that have both 4 and 8ohm available).
And if Bl has to be somehow proportional to Re, is it really possible for a 8" Deaf Bonce driver to have 2x1ohm impedance (Re not specified) with a Bl of 18,4 and a Qts of 0,55 (while this Bl would mean a qts of around 0,26) ?
Could someone help me to make it a bit clearer before i start building everything ?
Thanks a lot for reading.
First, sorry for my probably not very good english.
I have 2 different DVC drivers for different subwoofer/bass speaker projects (Ciare HSG200-44 and Ciare HSB320-44). I simmed only dividing Re by 4 but i just read that Bl also has to be divided (by 2).
However i still don't know how to sim with 2 separate amps as the BL apparently also has to be divided by 2 (same for Re) which doesn't match with Qes.
Btw, I have to say i still have doubts as many 4ohm drivers often have close Bl characteristics to the 8ohm models (for drivers that have both 4 and 8ohm available).
And if Bl has to be somehow proportional to Re, is it really possible for a 8" Deaf Bonce driver to have 2x1ohm impedance (Re not specified) with a Bl of 18,4 and a Qts of 0,55 (while this Bl would mean a qts of around 0,26) ?
Could someone help me to make it a bit clearer before i start building everything ?
Thanks a lot for reading.
Basically you don't.
So you just model everything with either the winding in parallel or in series.
When in parallel, you could connect those to each their own amplifier, or two just one amplifier.
The impedance is double per amplifier, compared to two in parallel.
This means that each amplifier only has to provide half the power, but still the same output voltage.
What is the watts rating of your driver's?
I don't know what enclosure type your are using
But normally you are displacement limited (xmax)
That means that you do not hit your driver max power rating because you reach your driver maximum cone displacement with much less power.
In that case why you want a 2kw amp if with 500 watts you are hitting xmax on your driver.
All depends on the driver specs and the type And tuning of your sub cabinet.
You can play with power inside horn resp and see if your driver can take the punishment or the cone rip apart in pieces!! 😜
I don't know what enclosure type your are using
But normally you are displacement limited (xmax)
That means that you do not hit your driver max power rating because you reach your driver maximum cone displacement with much less power.
In that case why you want a 2kw amp if with 500 watts you are hitting xmax on your driver.
All depends on the driver specs and the type And tuning of your sub cabinet.
You can play with power inside horn resp and see if your driver can take the punishment or the cone rip apart in pieces!! 😜
I'd love to. The problem is: i don't even know if all the given parameters are for a series wiring. For the 8" it's a Bl of 14,9 and a Re of 6ohm while the Qes is 0,39. Hornresp tells me that the Bl would be 10,61 with the Re at 3ohm (2 amps) and i read i should divide 14,9 by 2 so the Bl would be around 7,5 which is not corresponding.I am hesitant to give a general answer, but just simulate both and you will know
But i find the correct result when simming in parallel (Re at 1,5ohms) with a Bl of 7,5.
Or i read BS or there is something i don't do correctly.
And i also have to ask how can the Bl almost not change between a 4ohm and a 8ohm driver of the same type while i apparently should divide the Bl by 2 going from a serie to a single or parallel wiring on a DVC driver ? (just to be sure there is no different way of measuring or indicating the Bl)
Both rated at 600w max if i remember correctly and the excursion is below 7,5mm (xmax) at the important frequencies and i'll control the rest with a mini-DSP (there's a huge progressive bump between 50 and 90hz both in spl and in excursion with lossy Le, i'll just get rid of it).
The enclosure is a small ~9lt passive radiator enclosure tuned in the low 40hz with a Seas extreme 25"PR that also behaves in its limitations.
(i could build a decently small powerful portable battery speaker with ~110db/1m max volume down to the low 40hz (-3db) if the sim is correct and normally the small mid speakers could survive too according to hornresp)
edit: btw I may also take an ESX QE822 for the job but i would have to take 2 different amps, according to the sim it would go 2db higher in the same volume thanks to its 20Bl but it is bigger and i would have to crossover at a lower frequency so the mids will need more volume too so the overall result may not be that different ('ill just wait to know if i'm correct)
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Ok so i did
Re/4 = 1,5ohm
Bl/2 = 7,5
Le/4 = 0,38
admitting the available parameters are for a serie wiring
With an enclosure volume of 9,5l and taking care of not going with more than 7,5mm excursion, result in half space is
(around)
109db 43,6hz (tuning frequency with the not modified weight of the PR)
112db 50hz
111db 55hz
110db 60hz
110db 70hz
111db 80hz
112db 90hz
112db at 100hz (could go higher at and above this frequency but anyway the small mids will not reach more than 112db, let's not make it sound unbalanced neither)
(mini DSP filter would be -3db at 55hz, -6db at 70hz, -5db at 90hz, -5 at 100hz and then progressively to -2db at 500hz, then crossover)
If you ask, the internal dimensions i expect now are 20x27x27cm and i will see if i have to make it deeper or shallower than 20cm depending on the exact volume of the other components (amps, battery, mids enclosures, tweeters back volume,...).
I'd just like to know if my parameter calculations are correct before going further.
Re/4 = 1,5ohm
Bl/2 = 7,5
Le/4 = 0,38
admitting the available parameters are for a serie wiring
With an enclosure volume of 9,5l and taking care of not going with more than 7,5mm excursion, result in half space is
(around)
109db 43,6hz (tuning frequency with the not modified weight of the PR)
112db 50hz
111db 55hz
110db 60hz
110db 70hz
111db 80hz
112db 90hz
112db at 100hz (could go higher at and above this frequency but anyway the small mids will not reach more than 112db, let's not make it sound unbalanced neither)
(mini DSP filter would be -3db at 55hz, -6db at 70hz, -5db at 90hz, -5 at 100hz and then progressively to -2db at 500hz, then crossover)
If you ask, the internal dimensions i expect now are 20x27x27cm and i will see if i have to make it deeper or shallower than 20cm depending on the exact volume of the other components (amps, battery, mids enclosures, tweeters back volume,...).
I'd just like to know if my parameter calculations are correct before going further.