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
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
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.
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.
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!
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!
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.
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.
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
Regards,
Roger
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
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
downloaded it, but caint get it to work...
and it doenst have DAYTON speakers in it at all....whats up with that ?
Acording to my volume stated by factory, what diminsions does the bow need to be
and it doenst have DAYTON speakers in it at all....whats up with that ?
Acording to my volume stated by factory, what diminsions does the bow need to be
Are you planning on building the 2 cubic foot vented box specified in your first post? For the MA driver? Are you thinking Dayton now (winisd lists them under DLS by the way)?
Well if you are building the vented box for the MA you just need to make sure the internal volume of your box is 2 cubic feet + the volume of your two ports (3"d x 15.5") + the volume of your plate amp(s) + the volume displaced by the speaker + the volume of your internal bracing.
This is how I would do it quickly.
1. Calculate port volume
Assuming you use .25" pvc pipe each of your ports are roughly 150 cubic inches each (pi*1.75*15.5, 1.75 opposed to 1.5 to account for .25 inch wall thickness).
2. Calculate the volume displaced by your plate amp.
Lets just assume 35 in^3.
3. Calculate (guesstimate) volume displaced by speaker
Let's assume 50 in^3
4. Calculate (guesstimate) volume displaced by bracing
Let's assume 300 in^3 (20" x 20" x .75")
4. Add up these volumes
Then you add up these measurements 2*12^3 (2 cubic feet) + 150*2 (for both ports) + 35 (plate amp) + 50 (speaker) + 300 (bracing)
... and you get 4141 in^3 (2.4 ft^3)
5. Find box dimensions with appropriate internal volume
You might have a depth, width, or height consideration that you need to abide by, but I am going to calculate a cube b/c it is easy and efficient by taking the cubed root of 4141 which is roughly 16 inches. The exact dimensions don't really matter (assuming they are not wildy disproportional) as long as the internal volume remains close to what you need.
Note: If you have 1" walls your port ends up being 1.5" from the rear wall, which might be to close for some but this is purely hypothetical.
Does that help at all?
Well if you are building the vented box for the MA you just need to make sure the internal volume of your box is 2 cubic feet + the volume of your two ports (3"d x 15.5") + the volume of your plate amp(s) + the volume displaced by the speaker + the volume of your internal bracing.
This is how I would do it quickly.
1. Calculate port volume
Assuming you use .25" pvc pipe each of your ports are roughly 150 cubic inches each (pi*1.75*15.5, 1.75 opposed to 1.5 to account for .25 inch wall thickness).
2. Calculate the volume displaced by your plate amp.
Lets just assume 35 in^3.
3. Calculate (guesstimate) volume displaced by speaker
Let's assume 50 in^3
4. Calculate (guesstimate) volume displaced by bracing
Let's assume 300 in^3 (20" x 20" x .75")
4. Add up these volumes
Then you add up these measurements 2*12^3 (2 cubic feet) + 150*2 (for both ports) + 35 (plate amp) + 50 (speaker) + 300 (bracing)
... and you get 4141 in^3 (2.4 ft^3)
5. Find box dimensions with appropriate internal volume
You might have a depth, width, or height consideration that you need to abide by, but I am going to calculate a cube b/c it is easy and efficient by taking the cubed root of 4141 which is roughly 16 inches. The exact dimensions don't really matter (assuming they are not wildy disproportional) as long as the internal volume remains close to what you need.
Note: If you have 1" walls your port ends up being 1.5" from the rear wall, which might be to close for some but this is purely hypothetical.
Does that help at all?
well sort of....
thats alot of math there...
pretty sure rectacgle...for port issues...
and the speaker has a double stack magnet(Hugh) even larger that than the titianic's
you stated a 16" cube...
so to go rectangle i need 18" Tall/Long...and 12"/14" for the rest
correct ?
thats alot of math there...
pretty sure rectacgle...for port issues...
and the speaker has a double stack magnet(Hugh) even larger that than the titianic's
you stated a 16" cube...
so to go rectangle i need 18" Tall/Long...and 12"/14" for the rest
correct ?
18*12*14=3024 cubic inches, which is smaller than what you need.
In my example you needed ~4041 in^3.
You could have internal dimensions of 18" x 15" x 15".
And don't forget that these are internal dimensions so if you use 3/4" MDF your box will have external dimensions of 19.5" x 16.5" x 16.5".
In my example you needed ~4041 in^3.
You could have internal dimensions of 18" x 15" x 15".
And don't forget that these are internal dimensions so if you use 3/4" MDF your box will have external dimensions of 19.5" x 16.5" x 16.5".
the box is built...
and drying...
tommorow is Sub Day...Yeah !
Built it out of 3/4" MDF, seperated the amp from the main box, and placed an extra 1/2" on the front and back, for a total of 1 1/4 thick...
braced the ports in the rear as well...
24" Long Total (last 4.5" is for the amp)
16.5" x 16.5" for the rest, with two 3" x 15.5" Ports...
Caint wait to hear it...
Keep ya posted...
and drying...
tommorow is Sub Day...Yeah !
Built it out of 3/4" MDF, seperated the amp from the main box, and placed an extra 1/2" on the front and back, for a total of 1 1/4 thick...
braced the ports in the rear as well...
24" Long Total (last 4.5" is for the amp)
16.5" x 16.5" for the rest, with two 3" x 15.5" Ports...
Caint wait to hear it...
Keep ya posted...
Sorry Of course it's 12 ohm in serie.
BUT The Small/Thiele parameters DO CHANGE, if you use the voice coils separate.
The parameters you got, was with the DVC in series og paralell.
Qes = 0,47 & Qts = 0,41
With the DVC separate this will be:
Qes = 0,94 & Qts = 0,74
Just try, and you will hear that with seriell or paralell you can achieve an flat response, but try separates, an you would get an about 6 dB boost around 50 Hz, who will make the sub sound "boomy"
An another issue is to adjust the gain of to amps to give the same amount of power, that aint easy.
Norcad
BUT The Small/Thiele parameters DO CHANGE, if you use the voice coils separate.
The parameters you got, was with the DVC in series og paralell.
Qes = 0,47 & Qts = 0,41
With the DVC separate this will be:
Qes = 0,94 & Qts = 0,74
Just try, and you will hear that with seriell or paralell you can achieve an flat response, but try separates, an you would get an about 6 dB boost around 50 Hz, who will make the sub sound "boomy"
An another issue is to adjust the gain of to amps to give the same amount of power, that aint easy.
Norcad
The parameters are the same as long as both coils are driven, be that series, parallel or separate. They only change when one coil is left open or shorted.
- Status
- Not open for further replies.