FAST or Econowave w. 15tbx40 woofer? - diyAudio
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Old 1st June 2015, 12:06 AM   #1
freddi is offline freddi  United States
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Default FAST or Econowave w. 15tbx40 woofer?

- already have some waveguides and knockdown trapezoidal cabinets laying around - but wonder if a "FAST" with passive network might be fun ? - the fullrange ideally should be inexpensive yet good - (I do have w8-1772 not in use)

http://bcspeakers.s3.amazonaws.com/2...08/44/296/file

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Last edited by freddi; 1st June 2015 at 12:54 AM.
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Old 1st June 2015, 06:00 PM   #2
xrk971 is online now xrk971  United States
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Your W8-1772 could be open baffle (on a 12 in wide baffle) and set the XO at 350Hz. Use a K15 for the 15TBX40. You need a miniDSP to make things easy rather than always messing with PLLXO's. Alternatively, make the KaZba for the 15TBX40 and have a full dipole system. You will definitely need miniDSP to do the EQ to get a flat FR from the dipole woofer.
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Old 2nd June 2015, 02:47 AM   #3
freddi is offline freddi  United States
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hi X - its a matter of space for setup, but in my closet are two H-baffles which can run GW1858 - those would probably go a bit lower than a reflex loaded with 15tbx40 - are there any turn-on/off thumps with a 2x4 MiniDSP? (I should have plotted these cabinets out to 1K)

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Old 2nd June 2015, 03:29 AM   #4
xrk971 is online now xrk971  United States
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the miniDSP's do not have turn on/off thumps but when enabling or disabling a channel via software, there is sometimes a mild pop (not thump). Nothing serious but it is audible. If you buy the $2 analog-to-digital volume pot and turn that down first, then no pop whatsover even when connecting or disconnecting inputs into the miniDSP.
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Old 17th June 2015, 06:58 PM   #5
djn is offline djn  United States
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I'd go for the Ewave. I've built 6 different versions of them and they all rock.
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Old 17th June 2015, 09:26 PM   #6
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Quote:
Originally Posted by djn View Post
I'd go for the Ewave.
Have you built any mini's (with a small wave guide 6-8")?
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Old 22nd June 2015, 05:59 PM   #7
djn is offline djn  United States
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I have used the 6x6 and really like the sound.
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Old 25th June 2015, 08:46 AM   #8
mrk7 is offline mrk7  Australia
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What are your goals, preferences and constraints and what waveguide do you have?

Controlled directivity (ala Ewave) is a good thing in my experience but those TB W8 drivers do look interesting (I'd try them sealed, open, cardiod if I had them).

If you want to experiment with different alignments and component configurations consider going modular and making a bass bin out of the trap cab. Can maybe integrate your waveguide or W8 driver later too if you design and assemble the box with that in mind.
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Old 25th June 2015, 09:18 PM   #9
freddi is offline freddi  United States
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got QSC waveguide, B&C DE25 and Dayton knockoff - that B&C really eats power to get much sense of dynamics - got 1kw/channel which might wake it - besides space constraints, I rarely feel up to doing much anymore. The trap cabinet could be :bottom vented like GR Koonce did reflex; rear vented, or if the waveguide goes "on top", front vented. It could also run sealed with a capacitor "boost" on the woofer.

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Old 28th June 2015, 03:17 PM   #10
Scott L is offline Scott L  United States
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Quote:
Originally Posted by xrk971 View Post
Your W8-1772 could be open baffle (on a 12 in wide baffle) and set the XO at 350Hz. Use a K15 for the 15TBX40. You need a miniDSP to make things easy rather than always messing with PLLXO's. Alternatively, make the KaZba for the 15TBX40 and have a full dipole system. You will definitely need miniDSP to do the EQ to get a flat FR from the dipole woofer.
That's one way I would NEVER use a w8-1772: in an open baffle.
The darn thing is lean enough on it's own below 700Hz as it is.
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