Edirol R4 Hard Disc Recorder Upgrades

Due to the circuit board layout the R4 Concert upgrade is optimized for microphones on channels 3 and 4 while 1 and 2 are tweaked for a line level (recording console or soundboard) source or a secondary mic pair (4 mic mix). A 4 microphone recording works best with the primary coincident directional mic pair( i.e. 90° X-Y hypercardioids) on channels 3 and 4 with a secondary or flanking pair of omnidirectional mics on channels 1 and 2. 4 directional mic mixes are not recommended. 3 microphone mixes should use channels 3 and 4 as a primary pair and channel 1 or 2 as the center mic. The use of an omni center channel, aligned with the coincident primary pair typically produces the best results for 3 mic mixes.

Concert MOD R4 reduces the hiss in the R4 as well as raises the input overload point. This prevents the mic preamp from clipping with loud signal sources as well as lowering noise. High grade input capacitors along with low noise, high speed op amps are used to rebuild the preamps. All features remain intact with the R4 Concert Upgrade. The Concert MOD R4 is well suited to either amplified or un amplified music.

R4 Ambient MOD with very low noise at high gain and very detailed sound designed for recording soft signals, like nature sounds and FX. Perfect for Surround Recordings of natural spaces using the Schoeps DMS mic setup or the Ambisonics Horizontal B format. This upgrade disables the 1/4" inputs, internal mics and the line input (i.e. the -30 dB Pad) in order to maximize signal quality for low sound pressure level sources. The input capacitors are replaced with ultra low distortion Elna Silmic II capacitors and all the op amps up to the A/D chips are replaced with lower noise, lower distortion and higher slew rate chips.

Edirol R4 Concert MOD
Edirol R4 Ambient MOD

Which Upgrade is best for my application ?
We do not ship outside the USA
We are only able to modify R4s we sell due to limited support personnel, sorry but no exceptions.