[OzarkTom]

You might also google the reviews on the Audiience 1+1 V2 speakers at about $1800 a pair. Again, no crossovers. My buddy Rex says these sound the best that he has ever owned in over 45 years, and Rex has owned almost everything including Maggies, Quad ESL63, avantgarde duo horn speakers, and Modded stack Quads.

These are small enough to fit in a suitcase, but Rex says they have the biggest soundstage he has ever had being driven by D.A.C. SMT amp.

http://www.dagogo.com/audience-clairaudient-11-v2-and-v2-loudspeakers-review

http://www.stereotimes.com/post/audience-clairaudient-11-monitors/

[OzarkTom]

My buddy Rex loves DIY, so he bought a pair of Glows.

[mresseguie]

Hi, OzarkTom.

I didn't thank you for the link to the Audience speakers I wathed XXX's review of them, but it didn't sway me much. I had not heard of Glow Audio before.

I will probably stick with either a TM or TMW design. I'm still working out the choice of drivers and whether to throw in a subwoofer with a sealed TM, or true three-way. I'm waiting on a couple price quotes now.

[planet10]

The reason for the MTM configuration is to equalize the lobe tilting relative to non time aligned TM designs.  However this results in a narrower lobe that can create marked tone variations at different listening heights.  One way to mitigate this is to have the mid woofers as close to the tweeter as possible.  This can best be achieved through the use of smaller drivers, thus why we see smaller drivers in MTM designs.

This problem goes away if you can get the driver centre-to-centre (M to M) to at or less than a ¼ wavelength of the XO frequency. This is next to impossible with typically used cones and domes.

We have done it a couple times using a really good 3 or 4" FR and a low XO. Ms in an ML-TL for really good LF extension. Here the most recent.



dave

[Folsom]

Dave can you do a "if I was 5" explanation of that?

[planet10]

I don't know if i can, that is a pretty simple explanation. Perhaps some greater detail? Make sure the terminology is clear?

The lobing issues that come with any multi-driver speaker is the physical separation of the drivers. It is really only an issue around the XO where both drivers are radiating at the same time (from drivers in physically different place). A little trig shows that this is frequency dependent.

If you can get the C-C within a ¼ wavelength at the XO the drivers are essentially coincident -- in the same place  -- as far as the XO is concerned.

Take 1000 Hz. The speed of sound is ~13,560 in/sec (at 1 bar and 20° C (?)). 13560/1000 = 13.56" is the wavelength. So ¼ wavelength =  3.4". For 250 Hz it would be 4x3.4=13.6".

The closer you can get the XO to the ¼ wl of the C-C the less loving issues you have. The XO for the speaker above is 250 Hz with a C-C of just under 13".

This speaker also retains much of what a FR is good at without some of the significant downsides of a FR. Also if you use a 1st order XO (easily done with a PLLXO) you can essentially maintain phase coherence over the speaker's bandwidth.

Did that help?

dave

[Folsom]

Dave, that's more helpful than you know.

[John Casler]

I auditioned the new Evoke Eddie three-way speakers. They sound fantastic, but they are 60 pounds each, so shipping alone would kill me. The manufacturer won't sell them as a kit.

Hi Michael,

I see this is an old post, and it may not help at all, but the production EDDIE'S are now 50# each