B.Flat Posted July 3, 2019 Share Posted July 3, 2019 Can anyone tell me, in layman's terms, If I could add a mid control, with possible two-choice freq. switch, to the existing Ibanez two-band preamp in my 1980 Ibanez RS924 ? If it is possible it would need to take its power from the existing 9v battery. I have a feeling this will not be possible but hope springs eternal etc.............. Quote Link to comment Share on other sites More sharing options...
ikay Posted July 3, 2019 Share Posted July 3, 2019 John East does a mid control (with variable freq sweep) that functions as a stand alone unit. I don't see why that couldn't be run either before or after your existing 2-band using the same power supply. Have a chat with John and I'm sure he'll sort you out. Quote Link to comment Share on other sites More sharing options...
B.Flat Posted July 6, 2019 Author Share Posted July 6, 2019 Hi Ikay. I have investigated the East mid control but I would prefer a switchable, 800/250hz ?, rather than continuously variable freq. pot. I have looked for self-build mid circuits on the net with no joy as yet (wrong search terms?), do you have any suggestions ? Quote Link to comment Share on other sites More sharing options...
itu Posted July 6, 2019 Share Posted July 6, 2019 Well, if you would like to adjust those frequencies at least sometimes, that variable could be modified to a switchable with a switch and two trimmers. Quote Link to comment Share on other sites More sharing options...
ikay Posted July 7, 2019 Share Posted July 7, 2019 (edited) If you're up for building it yourself here's a circuit for a mid control. This has sweepable freq (160 - 1kHz) but, as ITU says, you could replace the dual gang pot (P2A / P2B in the schematic) with a switch and two trimmers (or perhaps two dual gang mini pots in this case) to select your chosen mid frequencies. http://www.redcircuits.com/Page168.htm It might be simpler to just swap out the existing preamp for a three-band with switchable mids! Eg. Aguilar OBP-3, Bartolini HR 2.4 AP/918 and others. Edited July 7, 2019 by ikay Quote Link to comment Share on other sites More sharing options...
roman_sub Posted July 12, 2019 Share Posted July 12, 2019 (edited) When faced with a similar issue as the OP, i did use the John East module, wiring it in series, after the original 2 band eq. It worked fine, but to be honest, if you are going to go that route, you might as well get a new 3 band preamp. I’ll explain why... 2 band preamps tend to be voiced differently to 3 bands, eg frequency centre and Q value of boost/cut (ie how smooth it is, or how far it extends). Generally, for 3 band; bass/treble EQ’s are a bit narrower in the frequency ranges they affect and frequency centres are pushed further apart - so that there is less overlap with the mids control. Given the effort in moving the controls around, rewiring the circuit, finding a mids module you like... much easier to go with a 3 band preamp! Edited July 12, 2019 by roman_sub Quote Link to comment Share on other sites More sharing options...
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