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Multi-Way Conventional loudspeakers with crossovers

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Old 27th April 2013, 02:11 PM   #151
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The second pic isn't an MTM more a TMMT and I'm not sure how that would work out... most likely would have interference problems..

Generally in an MTM both mids run with the same crossover. In a 2.5 way the configuration is more likely to be TMM (with tweeter on the top) and one of the woofers (probably the bottom one) only covers the lower bass whereas the other one covers bass and midrange. The one covering only the bass augments the bass at frequencies where baffle step is reducing the output.

Tony.
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Old 27th April 2013, 04:07 PM   #152
ODougbo is offline ODougbo  United States
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Wintermute,

Thanks, simple enough (guessing a 2.5 is more expensive).

Pic - Flipped speaker(s) and use both sets of xo's (4) for this 2.5 test run (top tweeter is not connected).

Sounds powerful, great bass, clear, good imaging. Need to think how to pull this together into one box.

[4ohm hookup now]
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Old 27th April 2013, 04:45 PM   #153
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That's ******* awesome! Speaker legos!

Making a 2.5 way has some benefits: if you have a BSC filter on the woofers, that can be removed in favor of a single inductor on the bottom woofer to roll it off at the baffle step frequency. Assuming you're running the drivers in parallel, you'll get higher efficiency so you also need less padding on the tweeter. Good luck!
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Old 27th April 2013, 05:02 PM   #154
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I think you read my mind......I was curious; why not just put a large series coil on the bottom woofer, e.g. 2.0mh - 3.0mh.

(the mid woofer has a 1.5mh with notch filters)

I think this is the way to go if looking for awesome bass and can handle a 4ohm load.
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Old 27th April 2013, 07:20 PM   #155
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Doug, it's very bad to leave a tweeter filter unterminated but connected. Very resonant to the amp. Be careful.

The series wired D'Appolito has a very simple connection. You wire the two basses and two bass filters in series, along with a single tweeter and filter. The levels work out, leaving the elegant conclusion that converting a standard two-way to a series wired D'Appolito is almost trivial. Bass impedance doubles, of course.

Simplifying the resulting bass filter is then a simple exercise of halving and doubling the component values. IIRC, you halve capacitance and double inductance and resistance.

The parallel wired 4 ohm D'Appolito is altogether more complex to design.
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Old 27th April 2013, 09:18 PM   #156
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Thanks Steve - for saving my neck - disconnected high side.

Presto Changeo
Only listened to the test boxes for a few hours before going crazy; cut off tops and gluing them top to bottom. There is substantial bass now; and I like the smooth roll-off
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Old 29th April 2013, 10:04 AM   #157
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The mid bass xo has other filters, so changing the series coil is worrisome.
(the xo at bottom is the mid/woofer components only)

I was curious if I could just change the bottom speakers' xo with say a 6.0hm lam. sub-woofer coil? [and/or add second amp]

How do these sounds as is? Not bad, better than I thought they as far as a Hifi sound. I was worried about the mid range, which is not bad and easy to listen to, but probably could use a little tweaking.

Crazy Bold Bass
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Old 30th April 2013, 09:54 AM   #158
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Not to belabor this idea, but these are turning out to be 2 foot tall monsters. The double 6.5s just pound away - effortlessly.

Been listening to a mix of sources/cds; I did think the cymbals in a Dire Straits song sounded a bit exaggerated, but still very natural sounding. Also a few action movies, all very impressive.

Could think about a new tweeter, but I think the xo point moved up; a new xo design would needed to save on copper coils.

Going to mount tweeter in middle here, hopping that doesn't mess with imaging
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Old 30th April 2013, 09:44 PM   #159
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slow going..but I think I'm on to something; which is also typical
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Old 30th April 2013, 11:41 PM   #160
AllenB is offline AllenB  Australia
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Quote:
Originally Posted by ODougbo View Post
Going to mount tweeter in middle here, hopping that doesn't mess with imaging
With the tweeter further from any edges the effect of diffraction ought to be reduced, which shouldn't be a bad thing for imaging.
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