In Reply to: RE: Current Maggies run full range compared to high pass and subs. posted by ColinB on December 28, 2020 at 19:47:17:
There's a certain amount of IM distortion "built in" to the speaker because of the mechanical crossover between the drivers. You can see this by exciting the woofer transducer and monitoring voltage on the tweeter transducer. (Or vice-versa....although not nearly as easy to see.)The "first-order" series crossovers obviously broaden the drive levels to each transducer and "blend" the drivers even further. And the single-ended operation causes more even-order distortion components. These are speakers not without significant distortion. :)
The electro-mechanical nature of these transducers has an inherent 2nd-order roll-off below resonance. Including dipole cancellation you net an approximate 3rd-order roll-off. Thus, I think it's appropriate to add a first-order electrical filter to the power amp drive that matches up (the best you can) with that 3rd-order roll-off point.
You then have a 4th-order acoustic roll-off which can be matched up to a subwoofer low-pass pretty well.That's my preferred way to operate the smaller Maggies.
Higher-order crossovers are popular too but, to me, it's difficult to blend them correctly.That said, and all other things being equal, rolling off the bass frequencies to the main panel will reduce all forms of distortion from the speaker....driven at the same nominal SPL level. That's just basic physical limitations at work.
Dave.
Edits: 12/28/20
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Follow Ups
- RE: Current Maggies run full range compared to high pass and subs. - Davey 21:08:37 12/28/20 (26)
- RE: "The electro-mechanical nature of these transducers has an inherent 12dB roll-off below resonance" ... - andyr 13:21:27 12/29/20 (6)
- RE: "The electro-mechanical nature of these transducers has an inherent 12dB roll-off below resonance" ... - ColinB 15:38:16 12/29/20 (2)
- RE: "which isn't possible with the other method" ... - andyr 16:14:51 12/29/20 (1)
- RE: "which isn't possible with the other method" ... - ColinB 16:45:56 12/29/20 (0)
- RE: "The electro-mechanical nature of these transducers has an inherent 12dB roll-off below resonance" ... - Davey 14:15:02 12/29/20 (2)
- RE: "The main point of my post concerned" ... - andyr 14:53:03 12/29/20 (0)
- RE: "The electro-mechanical nature of these transducers has an inherent 12dB roll-off below resonance" ... - ColinB 14:47:18 12/29/20 (0)
- RE: Current Maggies run full range compared to high pass and subs. - ColinB 21:55:25 12/28/20 (18)
- RE: Current Maggies run full range compared to high pass and subs. - dumpingground 17:33:17 12/29/20 (6)
- RE: Current Maggies run full range compared to high pass and subs. - ColinB 17:48:44 12/29/20 (5)
- RE: Current Maggies run full range compared to high pass and subs. - dumpingground 17:53:25 12/29/20 (4)
- RE: Current Maggies run full range compared to high pass and subs. - ColinB 18:13:17 12/29/20 (3)
- RE: Current Maggies run full range compared to high pass and subs. - dumpingground 18:36:36 12/29/20 (2)
- RE: Current Maggies run full range compared to high pass and subs. - ColinB 20:11:27 12/29/20 (0)
- RE: Current Maggies run full range compared to high pass and subs. - ColinB 19:16:30 12/29/20 (0)
- RE: Current Maggies run full range compared to high pass and subs. - Davey 05:59:23 12/29/20 (10)
- RE: Current Maggies run full range compared to high pass and subs. - ColinB 07:57:12 12/29/20 (9)
- RE: Current Maggies run full range compared to high pass and subs. - Davey 09:05:40 12/29/20 (8)
- RE: Current Maggies run full range compared to high pass and subs. - ColinB 11:42:00 12/29/20 (0)
- RE: Current Maggies run full range compared to high pass and subs. - rivervalley817 09:11:50 12/29/20 (6)
- RE: Current Maggies run full range compared to high pass and subs. - ColinB 11:36:31 12/29/20 (4)
- RE: Current Maggies run full range compared to high pass and subs. - rivervalley817 14:33:02 12/29/20 (3)
- RE: Current Maggies run full range compared to high pass and subs. - ColinB 15:28:33 12/29/20 (2)
- RE: Current Maggies run full range compared to high pass and subs. - rivervalley817 15:48:45 12/29/20 (1)
- RE: Current Maggies run full range compared to high pass and subs. - ColinB 16:22:28 12/29/20 (0)
- RE: Current Maggies run full range compared to high pass and subs. - Davey 10:19:21 12/29/20 (0)