critterkllr
Well-known member
I've been using a stereo pair of AEA R84 Ribbon mics as drum overheads. I'm planning to build a stereo preamp with some eq for them. I'd like to end up with something similar to the AEA RPQ.
http://www.ribbonmics.com/pdf/RPQ_Technical_Onesheet_6_web.pdf
It seems pretty straight forward. I'm not trying to rip off the RPQ with an exact clone, but would like to make something with similar features. The unit contains a stereo pair of preamps, high pass filters, high shelf filters/boosts. The marketing of the RPQ boasts a "No Load input impedance of 10,000 Ω" and a "Low Energy Storage circuit design that instantly recovers overloads for superior dynamic performance". I don't know if this is marketing BS or what. I have a few questions:
1) Can anybody recommend a mic pre that is low noise, clean, offers 60db to 80db of boost, and has an input impedance of around 10,000 Ω? I was thinking about an SSL 9k or Pre Grinder. Can the input impedance be changed on these to suit the mics? The extent of my experience with mic pres is Neve and API style. Any recommendations of a clean style pre for ribbon overheads would be appreciated.
2) Will a passive variable high pass filter work fine here?
3) I'd like to find a schematic for a high shelf boost with variable freq from 2.1k to 26k. Any suggestions?
I can etch a pcb from a schematic, but I'm not experienced with design from scratch. I'll need to mostly use parts from existing projects to piece this together for myself.
Thanks!
http://www.ribbonmics.com/pdf/RPQ_Technical_Onesheet_6_web.pdf
It seems pretty straight forward. I'm not trying to rip off the RPQ with an exact clone, but would like to make something with similar features. The unit contains a stereo pair of preamps, high pass filters, high shelf filters/boosts. The marketing of the RPQ boasts a "No Load input impedance of 10,000 Ω" and a "Low Energy Storage circuit design that instantly recovers overloads for superior dynamic performance". I don't know if this is marketing BS or what. I have a few questions:
1) Can anybody recommend a mic pre that is low noise, clean, offers 60db to 80db of boost, and has an input impedance of around 10,000 Ω? I was thinking about an SSL 9k or Pre Grinder. Can the input impedance be changed on these to suit the mics? The extent of my experience with mic pres is Neve and API style. Any recommendations of a clean style pre for ribbon overheads would be appreciated.
2) Will a passive variable high pass filter work fine here?
3) I'd like to find a schematic for a high shelf boost with variable freq from 2.1k to 26k. Any suggestions?
I can etch a pcb from a schematic, but I'm not experienced with design from scratch. I'll need to mostly use parts from existing projects to piece this together for myself.
Thanks!