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Old 12th January 2013, 03:52 PM   #31
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Yeah, will try to get a listen within a month or so. This guy lives ~140km away and without a driver license it can be a bit hard to travel around.
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Old 12th January 2013, 04:33 PM   #32
bjorno is offline bjorno  Sweden
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Hi,

Suggestion within the Budget:

b
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Old 12th January 2013, 04:43 PM   #33
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Quote:
Originally Posted by bjorno View Post
Hi,

Suggestion within the Budget:

b
Thanks, and how would the cabinet look like?
It seems like you have suggested vented, closed and some kind of TH or TL box?
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Old 13th January 2013, 05:48 AM   #34
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Quote:
Originally Posted by Rullknufs View Post
If keeping my current woofers is a horribly bad idea, then what else would you recommend?
Hardly a bad idea as the end loaded MLTL I simmed shows solid performance to below 20 Hz in room, but now you've added a new restriction in size, so its 190-200 L gross is too big.

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Old 13th January 2013, 05:27 PM   #35
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If I was in your shoes, I would assemble a single, isobaric, 6th order bandpass box, incorporating both of your existing drivers.


Front chamber 15l, tuned to 40 hz. Port = 1.5" x 4.4"

Rear chamber, 45l, tuned to 20 hz. Port = 2" x 11.6"

You could use one of your existing 45l enclosures for the rear chamber and then just build around it.

This would give you a rising FR arch starting at -3db at 62hz, up to +5db at 30hz, rolling down to +2db at 20hz, with an f10 of 15hz.

The only questions I can't answer are; can you fit one driver and the port into the 15l front chamber, and can you hit desired SPL without rocking the excursion?

It would cost next to nothing to try it, and it would be fun.

I can post the WinISD graph a bit later.

Last edited by cogitech; 13th January 2013 at 05:30 PM.
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Old 13th January 2013, 06:29 PM   #36
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Quote:
Originally Posted by cogitech View Post
If I was in your shoes, I would assemble a single, isobaric, 6th order bandpass box, incorporating both of your existing drivers.


Front chamber 15l, tuned to 40 hz. Port = 1.5" x 4.4"

Rear chamber, 45l, tuned to 20 hz. Port = 2" x 11.6"

You could use one of your existing 45l enclosures for the rear chamber and then just build around it.

This would give you a rising FR arch starting at -3db at 62hz, up to +5db at 30hz, rolling down to +2db at 20hz, with an f10 of 15hz.

The only questions I can't answer are; can you fit one driver and the port into the 15l front chamber, and can you hit desired SPL without rocking the excursion?

It would cost next to nothing to try it, and it would be fun.

I can post the WinISD graph a bit later.
It looks like it would give me quite poor maxspl though, and group delay seems high too.
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Old 13th January 2013, 08:44 PM   #37
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That may be true, however:

1) The price is right.

2) Group delay is arguably irrelevant at these hz.

3) It will fill in the <35 hz range better than what you have.

4) If you don't like it, you've lost very little and learned a great deal.

BTW, I have never built a bandpass box. This alone is a reason to ignore my advice. This is also exactly the reason why I would build one, if in your shoes.

Even if it is a temporary experiment, it is worth doing. YMMV.
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Old 13th January 2013, 08:56 PM   #38
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Quote:
Originally Posted by cogitech View Post
That may be true, however:

1) The price is right.

2) Group delay is arguably irrelevant at these hz.

3) It will fill in the <35 hz range better than what you have.

4) If you don't like it, you've lost very little and learned a great deal.

BTW, I have never built a bandpass box. This alone is a reason to ignore my advice. This is also exactly the reason why I would build one, if in your shoes.

Even if it is a temporary experiment, it is worth doing. YMMV.
Sounds ok, will give it a try whenever I find some spare time. I think I have some more 22mm particle board somewhere around the house. I wonder though how I will fit both driver and port in 15l...

And by the way, with that port sizes I will get insane air speeds in the ports. Front port at 50W input will hit up to 40m/s and rear port will be high too but not as bad.
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Last edited by Rullknufs; 13th January 2013 at 09:00 PM.
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Old 13th January 2013, 09:32 PM   #39
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Hmmm... WinISD says the port speeds are OK. 0.06 and 0.07 vent mach...

Regarding the 15l front chamber, I was thinking you could build the chamber big enough to hold the driver and port, calculate the size of the chamber afterwards, then add solid material to displace the extra volume to achieve 15l.
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Old 13th January 2013, 09:45 PM   #40
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... after a bit of play with the box dimensions it appears that you could go with a box with overall dimensions of 12" x 12" x 36" outer dimensions (using 22mm material).

This would make the front chamber 12" x 12" x 8" (outer dimensions, using 22mm material).

Is that big enough?
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