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Old 25th August 2019, 02:04 PM   #2231
hhhh is offline hhhh  Canada
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I actually have Model 3s and Model 4s, so I could do what you have, but the 3s are non-Medallion and the 4s are Medallion, so there might be a little mismatch. I don't think I'd get it past the interior decorator department though. Is that 1"X3" wood used as a frame?
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Old 25th August 2019, 02:10 PM   #2232
Lampie519 is offline Lampie519  Netherlands
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Not sure what you mean by medallion. The model 4 have 2 narrow and 2 wide panels. Just make sure to match the panels stacking them.
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Old 25th August 2019, 02:11 PM   #2233
Lampie519 is offline Lampie519  Netherlands
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The x3 could be a nice frame as a basis.
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Old 25th August 2019, 02:21 PM   #2234
hhhh is offline hhhh  Canada
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The Medallion transformer upgrade was available in the mid-1980s and replaced both the LF and HF transformers with transformers with better inter-leaved windings with superior sonics. It was around a US$600 upgrade that was factory installed by shipping your interfaces to the factory. A blue sticker was put on the interface to indicate the upgrade. A little later, the C-mod was incorporated which changed the "crossover" and impedance matching of the HF transformer which lowered the distortion by allowing less LF signal into the HF path. This was combined with the Medallion transformer upgrade and a red sticker was applied to the interface. There's lots more information on this thread if you search.
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Old 25th August 2019, 02:42 PM   #2235
Lampie519 is offline Lampie519  Netherlands
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Now i get it! But the panels are unchanged i guess. Not sure if it would matter if you add more panels and if they are devided. Is there a schematic?
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Old 25th August 2019, 03:01 PM   #2236
hhhh is offline hhhh  Canada
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Right, the panels were unchanged, but they did change to 5-wire from 3-wire at some point for better charge distribution. Here's the "C-mod" schematic and instructions:

https://www.diyaudio.com/forums/atta...terfaces-1-jpg
https://www.diyaudio.com/forums/atta...d-rev-2018-pdf

Last edited by hhhh; 25th August 2019 at 03:05 PM.
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Old 25th August 2019, 03:28 PM   #2237
Lampie519 is offline Lampie519  Netherlands
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In this case i cannot be of help really as i do not have any experience adding panels to transformers. My guess would be to place the HF panels more inward and add only LF panels left and right. So you have only one line source with HF per side (left and right). In this case you could stack the units with the 5 wires.
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Old 25th August 2019, 03:45 PM   #2238
hhhh is offline hhhh  Canada
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When I referred to the "high frequency" panel, I meant the 8" which has a slightly higher resonant frequency than the 9". I think the design intent of different widths was to prevent excessive combing effect. They're really all full range and the HF output is probably almost identical, but I'd imagine that the 9" panels have a little better bass extension. In the Spectras, they ran portions of the panels as high, mid and/or low.
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Old 25th August 2019, 03:58 PM   #2239
Lampie519 is offline Lampie519  Netherlands
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I also have 2 different panel sizes ( same as yours just 3 wires each). In my case the smaller once are in the middle side by side in the model 4’s and all the rest is wider. I also would like to stack the snaller panels to create a 6 panel model 3 version. Then 2 more that face each other as explained earlier. I have all the panels in house just not the place and energy to start on it now. It is on my todo list (as so many things).
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Old 25th August 2019, 06:21 PM   #2240
mraudioguru is offline mraudioguru  United States
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Wow! Talk about some Frankenstats!

Last edited by mraudioguru; 25th August 2019 at 06:24 PM.
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