Re: MG 3a's vs MG 3.6 - andyr - Planar Speaker Asylum

Re: MG 3a's vs MG 3.6

Posted by andyr (M) on October 27, 2003 at 04:12:31

In Reply to: MG 3a's vs MG 3.6 posted by jcw on October 26, 2003 at 07:41:53:

Hi jcw,

I've had my IIIas for almost as long as you, although I've only listened to them in the same 27' x 17' room all the time.

However, at one stage I did have a pair of 3.3Rs to compare against my Maggies (which had their crossovers upgraded with Solo coils and Solen/Infini caps).

My understanding is that, really, there are minor differences between the IIIas, the 3.3Rs and the 3.5Rs. Particularly if you compare a stock standard 3.5R with some IIIas which have had their (crap) stock crossovers upgraded.

However, the 3.6 is a big step forward as it has a push-pull magnet arrangement? Is this right, you 3.6 owners? Even so, the same condition applies - you can make them sound much better (and much, much better than IIIas) by doing the same component replacements!

Re. the Maggie IIIa base/mid-panel crossover points:
* the base LP slope is 18dB
* the mid HP slope is 12dB
* the manual says the base LP crossover (-3dB) point is 300Hz
* the manual says the mid HP crossover (-3dB) point is 500Hz.

However, I've modelled the Maggie IIIa crossover values and the graph gave the following -3dB points:
* base LP -3dB point: 290Hz (near enough!)
* mid HP -3dB point: 740Hz!

I suspect this 'gap' would explain the recessed mid-range which you hear. In other words, if you redo your crossovers (or replace passive crossovers with active), you should change the component values to lower the mid HP -3dB point to, say, 400Hz.

Regards,

Andy

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Follow Ups Full Thread

Topic - MG 3a's vs MG 3.6 - jcw 07:41:53 10/26/03 (24)

Re: MG 3a's vs MG 3.6 - bobwire 07:47:07 10/27/03 (1)

Re: MG 3a's vs MG 3.6 - pburke 13:41:34 10/28/03 (0)

Re: MG 3a's vs MG 3.6 - andyr 04:12:31 10/27/03 (4)

Re: MG 3a's vs MG 3.6 - monk1 09:16:17 10/27/03 (2)

Re: MG 3a's vs MG 3.6 - Green Lantern 09:49:19 10/27/03 (1)

Apogee didn't have P-P - lwang 21:19:48 10/27/03 (0)

The only push-pull maggie config is the 20.1 (n/t) - joeb 08:37:03 10/27/03 (0)

Bass- Mid X0 = Low pass is 18db @ 300hz, high pass 12 db @ 500 <nt> - neolith 16:43:21 10/26/03 (0)

Re: MG 3a's vs MG 3.6 - akino 08:19:01 10/26/03 (15)

Re: MG 3a's vs MG 3.6 - andyr 04:16:22 10/27/03 (14)

Re: MG 3a's vs MG 3.6 - pburke 10:06:10 10/28/03 (0)

Re: MG 3a's vs MG 3.6 - akino 07:31:49 10/27/03 (12)

Re: MG 3a's vs MG 3.6 - andyr 11:57:47 10/27/03 (11)

Re: MG 3a's vs MG 3.6 - akino 12:15:25 10/27/03 (10)

Re: MG 3a's vs MG 3.6 - andyr 12:48:48 10/27/03 (9)

Re: MG 3a's vs MG 3.6 - akino 13:03:28 10/27/03 (8)

Re: MG 3a's vs MG 3.6 - andyr 13:48:15 10/27/03 (7)

Re: MG 3a's vs MG 3.6 - sailor 10:23:41 10/28/03 (1)

Re: MG 3a's vs MG 3.6 - andyr 14:38:59 10/28/03 (0)

Re: MG 3a's vs MG 3.6 - pburke 10:20:58 10/28/03 (4)

Re: MG 3a's vs MG 3.6 - akino 17:01:15 10/28/03 (3)

Re: MG 3a's vs MG 3.6 - andyr 19:40:26 10/28/03 (2)

Re: MG 3a's vs MG 3.6 - pburke 14:36:51 10/29/03 (1)

Re: MG 3a's vs MG 3.6 - akino 06:42:45 10/30/03 (0)

Follow Ups

Re: MG 3a's vs MG 3.6 - andyr 04:12:31 10/27/03 (4)

Re: MG 3a's vs MG 3.6 - monk1 09:16:17 10/27/03 (2)

Re: MG 3a's vs MG 3.6 - Green Lantern 09:49:19 10/27/03 (1)

Apogee didn't have P-P - lwang 21:19:48 10/27/03 (0)

The only push-pull maggie config is the 20.1 (n/t) - joeb 08:37:03 10/27/03 (0)

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