C-1200/1200H bass horn or transmission line

[gasfan]

As I mentioned, these are altered. In searching the forum I found references to the 2206s as mid base in one of your threads. It just so happens they are what I have. I will also use 2441/2390s. They will be fully active. What is the best case scenario for the dog box?

[gasfan]

I guess my question is which type of enclosure will take best advantage of the 2206, sealed or ported? It only has to work from about 300hz so is it possible to downsize it to fit? How do I calculate that? Or should I just use a 1cu.ft. box which fits?

[more10]

If you choose ported for 2206 you will have problems integrating it because the port will shift the phase considerably. Use WinISD Pro Alfa to simulate response of your boxes. You will also need to handle baffle step in you design.

[gasfan]

Does the 2206 have to have a 4cu.ft. sealed dog box?

[more10]

I believe that if you are going to use the 2206 from 300 Hz you can build the box very small. But simulation is needed, I can do one for you.

[gasfan]

I believe that if you are going to use the 2206 from 300 Hz you can build the box very small. But simulation is needed, I can do one for you.

Well, coming to me, that would be more priceless information, wouldn't it. Thank you

[ivica]

Does the 2206 have to have a 4cu.ft. sealed dog box?

I think that for 2206 'closed box' of 1 to 2 cft would be more then enough (over 300Hz), but using 2206 over 1kHz, would be may be questionable
Regards
Ivica

[gasfan]

I think that for 2206 'closed box' of 1 to 2 cft would be more then enough (over 300Hz), but using 2206 over 1kHz, would be may be questionable
Regards
Ivica

The 2441/2390s will take it from probably 800, I'm thinking.

[more10]

Well, coming to me, that would be more priceless information, wouldn't it. Thank you

2206H/J 300 mm (12 in) Low Frequency Transducer

Baffle Cutout Diameter
Front mount or rear mount: 280 mm (11 1/16 in)
Depth7: 127 mm (.5 in,)

Volume Displaced by Driver: 41(0.15 ft3)
Clearance of at least 76 mm (3 in) must be provided behind the magnet assembly and the
gap vents to allow sufficient air circulation and proper cooling to take place.

The smallest box you can make is 2.8 x 2.8 x (1.27 + 0.76) - 4 = 12 liter. This gives a QTC of 0.785. You will get flat response down to 200 Hz. Group delay will be 0,4 ms at 300 Hz. Maximum SPL 124 dB. The first standing wave (half wave) between top/bottom and right/left will be at 607 Hz . You will have a quarter wave resonance between back and front at 420 Hz.

If you make the box dimensions according to "golden ratio" you will have a box of 20.3 x 32.8 x 53.1 cm. This will give a volume of 31 liters. This will give a QTC of 0.57, very close to "Max flat delay" optimization. You will gain 0.1 ms in group delay and loose 1 dB at 300 Hz. I have no idea if a golden ratio box will improve anything regarding standing waves :-).

If you make a vented box of 27 liters (quasi butterworth) the result will be very close to the golden ratio sealed box. Above 300 Hz the phase will not be a problem (I was wrong in an earlier post). You will have the added benefit of venting out heat through the ports.

[more10]

Impedance and maximum spl.

[4313B]

I've given up on the golden ratio boxes, they just don't seem to sound as good as the deeper boxes. Perhaps turning the golden ratio box sideways (1.62:0.62:1 instead of 1.62:1:0.62) would work. I almost alway use the 1.25:1:0.8 or 1.2:1:0.8 boxes.

The standing waves can clearly be seen in an impedance curve of the box without fiberglass. Fiberglass marginalizes the standing waves. I know alot of people QQ when dealing with fiberglass though. Sucks to be them I guess.

[gasfan]

Impedance and maximum spl.

My goodness! Is there anything you need? Is there a benefit to a sealed box with this driver? The faster the better. I want to hear every individual wire on the snare.

[4313B]

My goodness! Is there anything you need? Is there a benefit to a sealed box with this driver? The faster the better. I want to hear every individual wire on the snare.

One hump instead of two screwing up your passive low pass filter? If you're active you don't care.

Don't forget about heat build-up in a sealed box. Some guys beat the crap out of this stuff and wonder why their coils fry in sealed boxes.

[more10]

Red = 31 liter sealed
Yellow = 12 liter sealed
Blue (hard to see) = 27 liter vented

One benefit of the sealed box is that you can build it smaller. The smaller box the worse impulse response though.

I believe maximum spl is 600W sinus. But in reality you will be able to feed this with a 1 kW (per channel) amp. My experience is that you don't need more than 300 W (8 ohm) per channel for midrange.

[Ian Mackenzie]

Try cutting some 12 inch concrete form tube so the rear end is cut on an angle on 30 degrees do it forms a cylinder. Glue a sheet of mdf on the angle end.

This will form a rigid enclosure with good acoutic properties.