While we are talking about Steve's Tympanis...

Posted by kff (A) on January 20, 2021 at 11:15:49

In Reply to: Crossover upgrade for Tympani IVa posted by SteveJewels on January 18, 2021 at 13:11:46:

I had these for a year and used the 0.5mH inductors that I use on my MG-IIIas in the tweeter attenuator on Steve's IVas. Since I need them for my IIIa I left Steve with a place for something. To get started he can easily jam a chunk of speaker wire into those two spots and bolt it down.

Would folks consider using the inductors as was discussed here a decade ago? I know I like the change it made in the sound of the IIIa taking the shrill out of the tweet.

As to the III/IIIa crossover vs. the IVa crossover, if Steve wants to upgrade the parts on the external crossovers, I'm damn sure he will use the values of the components in his boxes and not the ones in the how to that I suggested he look at to see what a crossover upgrade is.

The stock crossover for the IIIa is from the rebuild
18dB/300Hz Low Pass
12dB/500Hz High Pass
12dB/2500Hz Low Pass
12dB/4400Hz High Pass

The IVa has from the diagram an incomplete list not specifying the complete tweeter LP/HP combo
18dB/250HZ Low Pass
12dB/400Hz High Pass
12dB/2700Hz

It is obvious that some cap values will be different and inductors might change but really it ain't rocket science and Steve can decide if he wants to get better parts and use those instead of the bulk buy parts Magnepan used to build the crossovers 30 years ago.

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Follow Ups Full Thread

Topic - Crossover upgrade for Tympani IVa - SteveJewels 13:11:46 01/18/21 (26)

RE: Crossover upgrade for Tympani IVa - andyr 16:56:49 01/23/21 (4)

RE: Crossover upgrade for Tympani IVa - mikebarney 05:56:01 02/23/21 (1)

RE: Crossover upgrade for Tympani IVa - andyr 23:52:12 02/23/21 (0)

RE: Crossover upgrade for Tympani IVa - Roger Gustavsson 00:58:28 01/24/21 (1)

RE: Crossover upgrade for Tympani IVa - andyr 02:52:48 01/24/21 (0)

While we are talking about Steve's Tympanis... - kff 11:15:49 01/20/21 (0)

Look at MUG For the III and IIIa crossovers and - kff 17:27:59 01/18/21 (19)

RE: Look at MUG For the III and IIIa crossovers and - Roger Gustavsson 01:47:43 01/19/21 (18)

RE: Look at MUG For the III and IIIa crossovers and - SteveJewels 17:26:26 01/19/21 (5)

RE: "I believe the tweeters are the newer version." .... - andyr 17:45:23 01/19/21 (4)

T-IVa ribbons - Roger Gustavsson 02:18:35 01/20/21 (3)

RE: T-IVa ribbons - Norman M 10:07:19 01/20/21 (0)

RE: "Well, the original ribbon that I have is 3 Ohm without any resistor." ... - andyr 03:11:11 01/20/21 (1)

RE: "Well, the original ribbon that I have is 3 Ohm without any resistor." ... - Roger Gustavsson 03:21:16 01/20/21 (0)

RE: Look at MUG For the III and IIIa crossovers and - Norman M 08:11:39 01/19/21 (11)

RE: Look at MUG For the III and IIIa crossovers and - Roger Gustavsson 08:56:57 01/19/21 (10)

RE: Look at MUG For the III and IIIa crossovers and - Norman M 09:46:32 01/19/21 (9)

RE: Look at MUG For the III and IIIa crossovers and - kff 11:25:12 01/21/21 (0)

RE: WOW - what a spray! ... - andyr 22:35:15 01/20/21 (6)

RE: WOW - what a spray! ... - Norman M 11:58:56 01/21/21 (0)

RE: WOW - what a spray! ... - Norman M 08:49:37 01/21/21 (3)

Everyone can benefit from a hobby (or two). - SteveJewels 10:08:30 01/21/21 (2)

RE: Everyone can benefit from a hobby (or two). - Norman M 13:33:53 01/21/21 (1)

RE: Everyone can benefit from a hobby (or two). - SteveJewels 16:48:49 01/21/21 (0)

T-IVa crossover(s) - Roger Gustavsson 01:30:31 01/21/21 (0)

RE: Look at MUG For the III and IIIa crossovers and - kff 10:58:52 01/20/21 (0)

Follow Ups

While we are talking about Steve's Tympanis... - kff 11:15:49 01/20/21 (0)

While we are talking about Steve's Tympanis...

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