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Original Message

RE: Adding a tweeter to MMG

Posted by JBen on February 23, 2017 at 00:55:39:

Aceinc, I found "B. B. King & Eric Clapton - Riding With the King". No issues on my [heavily modded] MMG's playing "solo". I spent the most time listening and measuring songs #5 & #12.

The bass on #5 (Three O'Clock Blues) even rattled something HERE in this room. I am writing from a room 30ft away straight line, on a PC remotely operating the others. For this to happen, however, I had taken the low filter off (which normally limits the "too much bass" of my MMG's.)

I also ran them with the cone woofers on briefly, for comparison. The additional low reach of the woofers can be heard and can be easily measured. However, their absence is not missed. One still gets enough of the bass, and often some fairly good dynamic punch. (though, sure, unaided Maggies can't do that....yeah, right.)

During the upcoming demo, my guess is that it could be the .7's the ones that get closer to this, if I remember well what you described. The current MMG's, out of the box...no chance. Since I won't be able to measure there, I'll just have to train my ears to one particular song.

So, please let me know if you have a preference for any of these songs in the album and I'll include it in the CD's that I am preparing for the demo session.

Here are SPL peaks reached for the respective frequencies during the initial 1 min 30 secs of 1 piece, with/without woofer. This was on Wednesday evening, mindful of my neighbor. (Please note, "no filters" means that the mid/bass driver is in its "natural" range, without extra xover filtering. This is NOT the normal usage. Normally, I use a low filter as in the last 2 graphs. One is another song (played for 2.5 minutes) but "with filter on". The other, #4, is the normal frequency response sweep, also with the filter on).

1. (below) BBKing-Clapton 3Oclock Blues 1.5 minutes -Peaks at -9db direct M-PC no Filters no Woofer.png






2. (below) BBKing-Clapton 3Oclock Blues 1.5 minutes -Peaks at -9db direct M-PC no Filters + Woofer.png




3. (below) BBKing-Clapton Come Rain 2.5 minutes -Peaks at -9db direct M-PC no Woofer.png




4. (below) MMG's frequency response measure at listening position on Feb-15-2017 (current but expected to change after upcoming room reconfiguration)