Sub design software ?

[Yousuredo]

I just email'd Ma Audio and got a responce less than 15 minutes later with the info I needed....
Now that was Kool...
So, here are me subs spec's...
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Ma Audio Sub MA 10D6 spec's
DVC, 6 0hm, 600w, doublestack magnet...

FO: 29.58
QMS: 3.48
Qes: 0.47
Qts: 0.41
Vas(L): 43.97
Revc(OHm): 2.7
Spl@ 1wate/1Meter(db): 85.66
Xmax Linear PK-Pk(mm): 20
Levc @ 1k Hz(mh): 1.4

Enclosure Volumes - Sealed:
Sealed(cu.ft.): 0.5
Fill Required (%): No
3db Down point(-3db hz): 51

Maximum Sealed(cu.ft.): .75
Fill Required (%): No
3db Down point(-3db hz): 50

ENCLOSURE VOLUMES - Ported:
Vented (Cu. Ft): 2
Vented to (Hz): 34
3dB down point (-3dB Hz): 29
Port Diameter ("): 3
Port Length ("): 15.5
Number of Ports: 2

All specifications are subject to change without written prior notice.

Each recommended enclosure volume is calculated using optimum
standards. You may alter these standards accordingly to suit your needs
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
does all this Look correct ?
if so, good...

now that I know the size for the enclosure...
My questions are:
-should I go, Ported/sealed (benifits of either)...?
-Rectangle/cube(benifits of either)...?
-forward/down firing (benifits of either)...?
-if downward, how far off the ground does it need to be ?

all sugestions welcome...
Chris

[henry zhang]

do you have the size of the box?

[richie00boy]

If you want a sub you have little choice but to go vented, unless you want to contstruct EQ circuits and have a big power amp handy.

I would not do a downfiring design unless the cone moves less than 1mm when tilting from vertical to horizontal positions.

Box shape is not really all that important in this instance as any dimension will be acoustically small.

[henry zhang]

yes,any part of a sub is very important.we need lots of calculation & test.

[Norcad]

This is a dual voice coil woofer, and in serial they will have an Imp of about 8 ohm

My suggestion is a vented box of 64 litres.
Tuned to 24 Hz by an vent tube with diam 100 mm, length 587 mm. As you can see the went tube is long, and may need to be bent in the box.

With an amp of 200 watt@ 8ohm, this will give you 110 dB@ 80 Hz, 107 dB@ 30 Hz, and 102 dB@ 20Hz.

With roomgain added this would be really nice, and powerfull.

The answer is:
- Ported, sealed will need strong eq
- Rectangle, because of the tube length
- Forward firing, because else the cone will "sag"

IMP! Dont use a stereo amp with the voice coils separated! This alters the subs spec alot!

[Yousuredo]

It it is a Dual 6 ohm voice coil...
how do I get it to 8 ohm...?
Parellel=3
series=12
correct...?

My AMP is a MONO Plate amp, from MCM, 150w(rms) @ 4ohms
can been seen Here
thanx for the input everyone...

[richie00boy]

You can't get 8 ohms.

There is also no problem driving it with a stereo amp as long as each channel of the amp is happy driving 6 ohms. If it was me I would bridge the amp and run the coils in series though, better losses and kinder on your amp as well as no problems with channel imbalance.

Running coils in series or separate has no impact on the Thiele-Small parameters.

[roger_lew]

I vaguely remember you saying you bought two of those plate amps in the other thread. You could use one for each voice coil if this is the case

Regards,
Roger

[Yousuredo]

So what is there to use to calculated volume size of a box...
so I can figure out what dimesions to build it...

should the ports fire forward, or ???
should the speaker be centered, offcentered, or ???
please help, I am about to start building it, this weekend

[richie00boy]

Download WinISD Pro and observe the frequency response and excursion and power graphs.