Could someone model the 19O.v2?

[jinjuku]

I have the Parms in WinISD Pro and not quite trusting the port/box dims it is giving me.

Shooting for a 20hz tune in a box as compact as possible. Slotted port or round ports Ok.

Qts: .369
Qes: .37
Qms: 7.5
Fs: 26.00Hz
Re: 3.5
Vas: 228L
Mms: 307.0g
Bl: 22.10T*m
SPL: 90.5dB
Sd: 1200cm²
Xmax: 22.0mm
Voice Coil: 62.5mm

Magnet Width: 8.200"
Cutout Diameter: 16.375"
Mounting Depth: 9.625"
Weight: 42lb
Total Height: 10.600"
Displacement: .10 ft³

 

[TLS Guy]

I have the Parms in WinISD Pro and not quite trusting the port/box dims it is giving me.

Shooting for a 20hz tune in a box as compact as possible. Slotted port or round ports Ok.

Qts: .369
Qes: .37
Qms: 7.5
Fs: 26.00Hz
Re: 3.5
Vas: 228L
Mms: 307.0g
Bl: 22.10T*m
SPL: 90.5dB
Sd: 1200cm²
Xmax: 22.0mm
Voice Coil: 62.5mm

Magnet Width: 8.200"
Cutout Diameter: 16.375"
Mounting Depth: 9.625"
Weight: 42lb
Total Height: 10.600"
Displacement: .10 ft³

You did not give the power rating, so I put in 200 watts.

That driver is for high spl rather than bass extension. Your box tuning is too low. The F3 in an optimal box of 4.8 cu.ft with a 10" x 3" slot vent 20" long gives an F3 of 35 Hz and an spl of 116 db with a drive of 200 watts.

The F3 is 35 Hz. If you go to an 8 cu.ft box you only gain 3 Hz with an F3 of 32 Hz and loose a lot of spl.

Within its band this is a superior woofer, but you won't get close to 20 Hz with it no matter what you do.

You will need a slot vent. I need to know the power you intend to use and that the driver can handle, as the port might have to be bigger. However at 200 watts max air velocity is only 12m/sec.

This driver has T/S parameters that make it equally suitable for ported or sealed applications.

 

[jinjuku]

eDesign lists a 4.5 cu foot sealed enclosure with a non-eq'd 22-100hz extension +/- 3dB.

The RMS with both voice coils is 1100 watts.

 

[its phillip]

Unfortunately eD's specs are a little optimistic. Ricci did test a A7S-450 not too long ago...review is here if you are interested:
http://avsforum.com/avs-vb/showthread.php?t=1345833

 

[TLS Guy]

eDesign lists a 4.5 cu foot sealed enclosure with a non-eq'd 22-100hz extension +/- 3dB.

The RMS with both voice coils is 1100 watts.

The 3 db point of that enclosure is 70 Hz. With the correct power, then that driver will deliver a whopping 124 db.

Now the output at 18 Hz is identical for the sealed and vented alignment.

4.5 cu.ft is optimal for sealed with an ideally situated Q.

Unequalized the output of the vented and sealed alignment is identical at 18 Hz which is 106 db.

However you have plenty of room to Eq the sealed alignment. With 12 db per octave boost starting at 100 Hz and a high pass filter somewhere between 20 and 25 Hz you have an awesome sub.

After running both alignments, I think the sealed alignment is the much more intelligent choice for that driver.

Now I know the power, then the vent needs to be 3.5" X 12" X 29. This gives a vent velocity of 18 m/sec.

 

[jinjuku]

The 3 db point of that enclosure is 70 Hz. With the correct power, then that driver will deliver a whopping 124 db.

Now the output at 18 Hz is identical for the sealed and vented alignment.

4.5 cu.ft is optimal for sealed with an ideally situated Q.

Unequalized the output of the vented and sealed alignment is identical at 18 Hz which is 106 db.

However you have plenty of room to Eq the sealed alignment. With 12 db per octave boost starting at 100 Hz and a high pass filter somewhere between 20 and 25 Hz you have an awesome sub.

After running both alignments, I think the sealed alignment is the much more intelligent choice for that driver.

Now I know the power, then the vent needs to be 3.5" X 12" X 29. This gives a vent velocity of 18 m/sec.

Cool. I started modeling with a sealed alignment and it's matching up. Sealed it is...

I figured with it's Bl and power handling it was going to be sealed.

Picked two for $250.