Cool thanks. I am happy building a set of speakers just to learn a new skill.. But if I can slowly iterate over a few variations to get something I like, that would be great.
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Maybe have a look at the Seas L15 -- mentioned by quite a few folks over the years https://www.diyaudio.com/community/threads/seas-l15rly-27tffc.313436/
Might be interesting to consider it with the Seas DXT tweeter - not sure if anyone has done that combo
Might be interesting to consider it with the Seas DXT tweeter - not sure if anyone has done that combo
MTM done right. Solid bass down to mid 20s, XO wiithin the magic quarter-wavelength criterion (250 Hz). Superb bottom to top. And the tweeter at ear level.
There are a lot of examples of and many reasons for an MTM. My mom loved her little Koss MTMs (2x3.5”, hooked to the TV).
There are marketing reasons, cosmetic reasons, design reasons, goal reasons, cost, size…
The above were a combination of no care about size, how low can we get the woofer (in a simple enclosure), 2 to get the 6dB Geoff mentioned to bring woofer sentisitivity to just the righyt level (about 2-3 dB more) ro match the midTweeter. Cost not a big consideration. Design goal of nea 10 octaves with an XO that is both lower than the quarterwave C-C and right in the zone where a tiny bit of lift happens below the 2∏ to 4∏ transition.
Pick a different set of goals and you end up somewhere else. There are lots of good designs, some really good designs, hopefully the not so good ones don’t survive “survival of the fittest”.
I am fond of the symmetry of an MTM with mirror image offset tweeters, one of my first creations was a pair of 6.5” english woofers i shouldn’t have had (clear poly, 1975, Harbeth?) in a triangulated TL with a tweeter (probably the ubiqitous Philips 1”).
1-ways, 2-ways, 3-ways, more-ways. Look around. Build something interesting. What you learn will inform you of your next build — the diyer that stops at 1 pair is rare.
dave
What's 'boring' about the Dalis, is it because they sound more laid back, or have a less bright sound than the Paradigms? I haven't heard either so I can't comment on the sound; sometimes a speaker might sound more 'exciting' but may not be suitable for long listening sessions.
As for brands for DIY speakers, there are many, depending what's available where you live; but it's really the design/designer that can be important rather than the brand. In Oz we're pretty much limited to Dayton Audio, Daichi, Scan Speak, Vifa/Peerless/Tymphany, SB Acoustics and Visaton, although there are many good projects which use those brands.
I've used SB, Peerless, Vifa, Morel and Dayton Audio and built readily available designs by Michael Chua, Curt Campbell, Paul Carmody and Ralf Giralfino of this Forum, plus some from other Fora (such as Midwest Audio Club/DIY) members.
Dayton Audio drivers are no longer very good value due to the A$ to $US exchange rate and high shipping costs, but SB etc make good drivers at various price points, even the cheaper ranges sound good. The last pair of speakers I made - Michael's Lark SMs - only cost A$130 for the SB and Vifa drivers and sound very good.
Geoff
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