Is this a good cabinet for a 8" (alone) woofer ?

lduarte1973 · 26th December 2011, 01:26 PM

Is this a good cabinet for a 8" (alone) woofer ?

Dayton Audio TW-0.75MA 0.75 ft³ 2-Way Cabinet Maple 302-736

bear · 26th December 2011, 01:37 PM

No way to know.

You need to have the T/S parameters of the driver first, then drop that information into a simulator to see the resulting curve. That will tell you if the volume of the box is large enough for a given driver, and what freq response at the lowest frequencies you might expect. If you have too much volume, it is possible to reduce the volume inside. But you can not make it larger.

_-_-bear

lduarte1973 · 26th December 2011, 01:41 PM

Visaton GF200

Nominal power handling 120 Watt
Peak power handling 180 Watt
Nominal impedance 8 Ohm
Frequency response (-10 dB) fc - 2000 Hz
Mean sound pressure level 88 dB (1 W/1 m)
Maximum cone displacement 20 mm
Resonance frequency fs 29 Hz
Magnetic induction 1,3 Tesla
Magnetic flux 930 µ Weber
Height of front pole-plate 6 mm
Voice coil diameter 38 mm
Height of winding 20 mm
Cutout diameter 190 mm
Net weight 2,5 kg
D.C. resistance Rdc 6,0 Ohm
Mechanical Q factor Qms 3,69
Electrical Q factor Qes 0,35
Total Q factor Qts 0,32
Equivalent volume Vas 73
Effective piston area Sd 214 cm2
Dynamically moved mass Mms 25 g
Force factor Bxl 9,2 T m
Inductance of the voice coil L 1,3 mH

jerome69 · 26th December 2011, 01:55 PM

Yes, 21 liters for a closed box or an aperiodic box, f3~60Hz. I like a lot this config

lduarte1973 · 26th December 2011, 02:25 PM

Thanks Jerome

oldmanaudio · 26th December 2011, 03:14 PM

50 Liters will give you a Qtc .707 which is max flat and a f3 of 48.5hz. This is with heavy fill in the box.

Michael Chua · 26th December 2011, 03:39 PM

Quote:

Originally Posted by lduarte1973

Is this a good cabinet for a 8" (alone) woofer ?

Dayton Audio TW-0.75MA 0.75 ft³ 2-Way Cabinet Maple 302-736

Yes, Box is suitable. You can use a Bass Reflex for lower F3 (50Hz).

If you want some mid bass punch, tune box for Fb=55Hz. Damping is still good at System Q=0.67

lduarte1973 · 26th December 2011, 04:14 PM

Thanks guys this will be a closed box , also closed box for mid/tweeter and 1 sub for channel.

Inductor · 26th December 2011, 05:26 PM

Quote:

Originally Posted by lduarte1973

Thanks guys this will be a closed box , also closed box for mid/tweeter and 1 sub for channel.

Duarte,
Good luck with your new project. Is it a 2+1? Are you using 1 (?) of the Visatons as a sub?
GF 200 2 x 4 OHM

oldmanaudio · 26th December 2011, 08:07 PM

Inductor makes a good point. This is a dual voice coil driver. Both coils in series makes it 8 ohms and EBP is 91 and Qts of 0.32 A vented box is a better choice.
25 liter box tuned to 37 hz with f3 53hz. In parallel makes it a 2 ohm load. Thats a hard load to drive. It pushes the box volume up to 35 liters tuned to 33hz and a f3 of 42hz. With only 1 coil used it makes it a 4 ohm load EBP of 45 Qts .65 which is better suited for closed box. Which pushes the box up to 50 liters. Are you sure about your t/s numbers?

26th December 2011, 01:26 PM	#1
lduarte1973 diyAudio Member Join Date: Feb 2009 Location: Lisbon	Is this a good cabinet for a 8" (alone) woofer ? Is this a good cabinet for a 8" (alone) woofer ? Dayton Audio TW-0.75MA 0.75 ft³ 2-Way Cabinet Maple 302-736

26th December 2011, 01:37 PM	#2
bear diyAudio Member Join Date: Apr 2002 Location: New York State USA	No way to know. You need to have the T/S parameters of the driver first, then drop that information into a simulator to see the resulting curve. That will tell you if the volume of the box is large enough for a given driver, and what freq response at the lowest frequencies you might expect. If you have too much volume, it is possible to reduce the volume inside. But you can not make it larger. _-_-bear __________________ _-_-bear http://www.bearlabs.com ...ur feeback please - like/dislike my what I have written? PM/email tnx. --

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26th December 2011, 01:41 PM	#3
lduarte1973 diyAudio Member Join Date: Feb 2009 Location: Lisbon	Visaton GF200 Nominal power handling 120 Watt Peak power handling 180 Watt Nominal impedance 8 Ohm Frequency response (-10 dB) fc - 2000 Hz Mean sound pressure level 88 dB (1 W/1 m) Maximum cone displacement 20 mm Resonance frequency fs 29 Hz Magnetic induction 1,3 Tesla Magnetic flux 930 µ Weber Height of front pole-plate 6 mm Voice coil diameter 38 mm Height of winding 20 mm Cutout diameter 190 mm Net weight 2,5 kg D.C. resistance Rdc 6,0 Ohm Mechanical Q factor Qms 3,69 Electrical Q factor Qes 0,35 Total Q factor Qts 0,32 Equivalent volume Vas 73 Effective piston area Sd 214 cm2 Dynamically moved mass Mms 25 g Force factor Bxl 9,2 T m Inductance of the voice coil L 1,3 mH

26th December 2011, 01:55 PM	#4
jerome69 diyAudio Member Join Date: Feb 2008 Location: Lyon	Yes, 21 liters for a closed box or an aperiodic box, f3~60Hz. I like a lot this config

26th December 2011, 02:25 PM	#5
lduarte1973 diyAudio Member Join Date: Feb 2009 Location: Lisbon	Thanks Jerome

26th December 2011, 03:14 PM	#6
oldmanaudio diyAudio Member Join Date: Jan 2010 Location: P.A.	50 Liters will give you a Qtc .707 which is max flat and a f3 of 48.5hz. This is with heavy fill in the box.

26th December 2011, 04:14 PM	#8
lduarte1973 diyAudio Member Join Date: Feb 2009 Location: Lisbon	Thanks guys this will be a closed box , also closed box for mid/tweeter and 1 sub for channel.

26th December 2011, 08:07 PM	#10
oldmanaudio diyAudio Member Join Date: Jan 2010 Location: P.A.	Inductor makes a good point. This is a dual voice coil driver. Both coils in series makes it 8 ohms and EBP is 91 and Qts of 0.32 A vented box is a better choice. 25 liter box tuned to 37 hz with f3 53hz. In parallel makes it a 2 ohm load. Thats a hard load to drive. It pushes the box volume up to 35 liters tuned to 33hz and a f3 of 42hz. With only 1 coil used it makes it a 4 ohm load EBP of 45 Qts .65 which is better suited for closed box. Which pushes the box up to 50 liters. Are you sure about your t/s numbers?

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