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Old 24th March 2013, 02:31 PM   #121
blue934 is offline blue934  Canada
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Have you got a layout for the finalized xover? There seem to be several iterations through out the thread.
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Old 24th March 2013, 04:15 PM   #122
ODougbo is offline ODougbo  United States
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Sure.

I made up a few of them, the caps/coils sounded about the same; I highly recommend mundorf resistors for the tweeter (2).
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Old 28th March 2013, 09:06 AM   #123
ODougbo is offline ODougbo  United States
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More drivers/xo parts on the way
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Last edited by ODougbo; 28th March 2013 at 09:08 AM.
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Old 28th March 2013, 07:56 PM   #124
tvrgeek is offline tvrgeek  United States
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Waiting on warmer drier weather to measure outside.
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Old 29th March 2013, 09:42 AM   #125
ODougbo is offline ODougbo  United States
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The 8" SF are here and looked at some sims. I don't see going larger than 22L - 23L.
http://www.madisoundspeakerstore.com...8-8-wool-cone/

I'd like to stick with the Penguin style box, using 5/8" thick ply for the dual vents.
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Last edited by ODougbo; 29th March 2013 at 09:44 AM. Reason: http://www.madisoundspeakerstore.com/approx-8-woofers/silver-flute-w20rc38-08-8-wool-cone/
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Old 29th March 2013, 03:57 PM   #126
system7 is offline system7  United Kingdom
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That Silver Flute vented 8" bass cone looks very nice, ODougbo!

A decision for you is going to be whether to wall mount it (ie Bookshelf), or freestand it with a bigger bafflestep coil away from the wall.

Looks like you just put a gentle notch at 4kHz and the slope is ideal for a simple crossover around 2.5 to 3kHz.

There's something you must know about the 8" woofer, 1" tweeter combination though. On a flat baffle you can get it phase aligned at crossover, but no better. With a bit of time alignment, you can get the phase alignment pretty much as good as you like across the 1kHz to 10kHz range. Being able to recess the tweeter between 3-6cms (more bafflestep needs more recessing) is just ideal, and your Penguin design seems able to accommodate this.

8" woofers also are rather loud, and it can be a struggle to get the tweeter loud enough, especially with the more efficient bookshelf designs.

Hope that helps.
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Last edited by system7; 29th March 2013 at 04:13 PM. Reason: Added comment about loudness.
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Old 30th March 2013, 12:46 AM   #127
ODougbo is offline ODougbo  United States
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Thumbs up Power to the Penguin

Thanks Steve, again very happy with the manufacturing of SF woofer (I'm sure the price will jump eventually). They look like "shallow" throw drivers (8" xmax is 5mm), which is suited nicely for the front port idea.
Free Standing. But will move closer as necessary in to wall to increase bass.
I have a stash of the old MDT28/30: 91db, 8ohm, same as woofer, which should be a nice change. I'll start there but willing to try others. I will miss the lightness of the Vifa X25. I'm curious if the newer Morels have better top end than the old generation.
Power to the Penguins! I have a flat pack of scrap wood at the ready, to build test box: 1,375cubic inch, tuned at 50hz. They are easy to build; will take some photos to show the 3 places that need need a fine fit, other than that, router trimming, etc.

xo and xo's point...2,000 - 2,500
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Old 30th March 2013, 03:23 AM   #128
system7 is offline system7  United Kingdom
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As mentioned in PM, here's the circuit that fixes the phase problems on the 8 ohm Silver Flute vented Woofer on a flat baffle. The 4kHz tank mainly fixes Phase. Sadly it doesn't work with the 4 ohm version.

It needs a special and EFFICIENT +90dB tweeter to make it work, and I had luck with a TW70 and KE25SC by Visaton. Maybe your Morels. Really don't know. You need a tweeter that dips into a saddle below 4.5kHz. This is a surprisingly high 3.5kHz crossover. Long live the Penguin.
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File Type: png ODougbo_Circuit.PNG (6.4 KB, 71 views)
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Good Night, and Good Luck. Best regards from Steve in Portsmouth, UK.

Last edited by system7; 30th March 2013 at 03:31 AM. Reason: Added crossover point info.
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Old 30th March 2013, 04:00 AM   #129
system7 is offline system7  United Kingdom
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The 104mm. Visaton SC10N works as well too.
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Old 30th March 2013, 06:18 PM   #130
ODougbo is offline ODougbo  United States
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Thanks for the help with the xo, not my forte

As you see a Morel ~ but placed it high the "tab" can be cut flush with top of cab.

Test box tuned at 40hz, but lots of materiel to trim/cut down (vent strips x 4).

New Pic - Looks the same as the 6.5 woofer, but this is the new 8" in a 1400 cubic inch box.
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