A thread for Tysen and variations on FAST - Page 13 - diyAudio
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Old 27th October 2009, 06:12 PM   #121
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Ok, thanks for that - going to go swap the cabs over, see if I notice anything...

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Old 29th October 2009, 02:32 PM   #122
ljfont is offline ljfont  Canada
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Quote:
Originally Posted by planet10 View Post

Bessel = 1/2 cubic ft
Butterworth = 1/4 cubic ft

I like to use 14-17 litre

dave
Changing the volume, changes the Q. But how does it really sound?

This question might be opinionated, but how would you correlate Bessel or Butterworth to how the low frequencies sounds? Tighter, Fatter, Rounder, etc.

Thank You.
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Old 29th October 2009, 07:21 PM   #123
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The lower Q boxes give a more even tighter bass, at least in my room, better matching the room gain, but this is so room and placement sensitive as to be very tentative. Most plate amps also have some ability to add bass boost, so a lower Q box gives more flexibility.

Effective box size can also be changed within reason with the amount of stuffing in the box.

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Old 29th October 2009, 08:46 PM   #124
ljfont is offline ljfont  Canada
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Default Adjustable Q?

With the amount of space left in this prototype. I was thinking about adding something to adjust the Q for the SDX7. Perhaps shelves that could be slid in and out to reveal another sub chamber to increase the volume. Not sure how to do it, it may require some tricky woodworking skills.

Should I start a separate thread for all of this?, I'm getting close to a prototype build.
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Old 29th October 2009, 08:49 PM   #125
ljfont is offline ljfont  Canada
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See Drawing. O yeah, currently the middle area hiding the BSC and/or networks.
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File Type: jpg Fast_FE167ERev1C.JPG (37.2 KB, 893 views)
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Old 29th October 2009, 08:54 PM   #126
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Quote:
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Should I start a separate thread for all of this?
For the variable volume SDX7 part yes... people will be interested in that separatly from FAST.

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Old 8th November 2009, 07:54 PM   #127
ttsto is offline ttsto  Romania
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Hi Dave and all contributing to this thread
I have interst also in building such enclosure, probably startig from FE167E or even FE207E.
I would like to uderstand more on what characteristics the woofer should be selected to best match the full-range driver.
Thank you
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Old 8th November 2009, 10:24 PM   #128
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I would like to uderstand more on what characteristics the woofer should be selected to best match the full-range driver.
A woofer with an extended range and a similar kind of character really helps when trying to get them to integrate. If you are going to attempt a passive XO, the woofer should be at least 3 dB higher than the FR.

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Old 9th November 2009, 05:53 AM   #129
ttsto is offline ttsto  Romania
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Dave, thank you for the response

Unfortunatelly I do not have your experience, so "similar character" does not really ring a bell to me...can you be more specific?

Thanks!
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Old 9th November 2009, 04:44 PM   #130
jleaman is offline jleaman  Belgium
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passice-active crossover, Since i am doing this, one amplifier per speaker, want to lend a hand with helping me with mine ?

Click the image to open in full size.

pretty simple to do, just need a start with values, sent u a email but not sure ur getting them.

Living room looks awesome dave
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