B.Flat Posted July 3, 2019 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
ikay Posted July 3, 2019 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
B.Flat Posted July 6, 2019 Author 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
itu Posted July 6, 2019 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
ikay Posted July 7, 2019 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
roman_sub Posted July 12, 2019 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
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