The Story
- For 500 Series Racks
- Single Channel
- Wide Gain Range
- Hi-Z Input
- Ribbon Microphone Mode
- Phantom Power
- High-Pass Filter
The m501 from Grace Designs is a 500 series microphone preamp module, based on the company's m101 microphone preamp. While the 500 series market has plenty of colored preamp options, the natural, musical clarity of the m501 makes it a welcome addition. This circuit is for engineers who wish to capture their sources with as little coloration or distortion as possible.
The m501 module features a balanced, transformerless design, with 48V phantom, a 75Hz high-pass filter, and a 1/4" HI-Z instrument input. Also standard is a ribbon microphone mode, which raises the input impedance, bypasses the input decoupling capacitors and deactivates 48V phantom to protect delicate ribbon microphones from damage.
- Single channel microphone preamp in the 500 series form factor
- Fast and musical transimpedance architecture
- Wide 10dB to 75dB gain range
- Updated audio path with 0.5% precision metal film resistors
- Sealed gold contact relay for Hi-Z input switching
- Ribbon microphone mode (also great for dynamic mics) - relay bypass of phantom power decoupling capacitors, increased input impedance and 48V lockout
- High performance output line driver amplifier and HPF amplifier
- Enhanced RFI interference suppression
- 12 position gold plated rotary gain switch
- 3 output connectors - XLR balanced, 1/4" TRS balanced and 1/4" TS unbalanced
- LED indicators for +48V, ribbon mode and high-pass filter
- Laser-etched black anodized frontpanel
- Made in the USA
- Five (5) Year Warranty
| Number of Channels | Single |
| Inputs | 1 x XLR (on 500 rack) 1 x 1/4" TS phone Hi-Z Instrument (on module) |
| Output | 1 x XLR 1 x 1/4" TRS phone 1 x 1/4" TS phone |
| Phantom Power | +48V |
| Multi Function | No |
| Gain Range | 10dB to 75dB (including +10dB trim) |
| Maximum Output Level | 27dBu (100k? load, 0.1% THD, 1kHz, API Lunchbox) |
| Frequency Response | 3.8Hz to 288kHz, -3.0dB, microphone input @ 40dB gain 8.4Hz to 135kHz, -0.5dB, microphone input @ 40dB gain 1.7Hz to 180kHz, -3.0dB, instrument input @ 20dB gain 4Hz to 72kHz, -0.5dB, instrument input @ 20dB gain |
| Noise | Referred to input @ 60dB gain: <-130dB with 50? source <-128dB with 150? source <-124dB with 600? source |
| Power Requirements | 120mA maximum current required from +16V and -16V power supplies |
| Dimensions (WxDxH) | 1.5 x 6.6 x 5.5" (38 x 168 x 140mm) |
| Weight | 0.7 lbs (316g) |
| Specialties | Ribbon microphone mode raises the input impedance, bypasses the input decoupling capacitors, and deactivates 48V phantom to protect delicate ribbon microphones from damage |
| Packaging Info | |
|---|---|
| Package Weight | 1.65 lb |
| Box Dimensions (LxWxH) | 12.1 x 10.3 x 4.4" |
Details & Craftsmanship
Every detail has been carefully considered to bring you the perfect product.
Details & Craftsmanship
Every detail has been carefully considered to bring you the perfect product.
Description
- For 500 Series Racks
- Single Channel
- Wide Gain Range
- Hi-Z Input
- Ribbon Microphone Mode
- Phantom Power
- High-Pass Filter
The m501 from Grace Designs is a 500 series microphone preamp module, based on the company's m101 microphone preamp. While the 500 series market has plenty of colored preamp options, the natural, musical clarity of the m501 makes it a welcome addition. This circuit is for engineers who wish to capture their sources with as little coloration or distortion as possible.
The m501 module features a balanced, transformerless design, with 48V phantom, a 75Hz high-pass filter, and a 1/4" HI-Z instrument input. Also standard is a ribbon microphone mode, which raises the input impedance, bypasses the input decoupling capacitors and deactivates 48V phantom to protect delicate ribbon microphones from damage.
- Single channel microphone preamp in the 500 series form factor
- Fast and musical transimpedance architecture
- Wide 10dB to 75dB gain range
- Updated audio path with 0.5% precision metal film resistors
- Sealed gold contact relay for Hi-Z input switching
- Ribbon microphone mode (also great for dynamic mics) - relay bypass of phantom power decoupling capacitors, increased input impedance and 48V lockout
- High performance output line driver amplifier and HPF amplifier
- Enhanced RFI interference suppression
- 12 position gold plated rotary gain switch
- 3 output connectors - XLR balanced, 1/4" TRS balanced and 1/4" TS unbalanced
- LED indicators for +48V, ribbon mode and high-pass filter
- Laser-etched black anodized frontpanel
- Made in the USA
- Five (5) Year Warranty
| Number of Channels | Single |
| Inputs | 1 x XLR (on 500 rack) 1 x 1/4" TS phone Hi-Z Instrument (on module) |
| Output | 1 x XLR 1 x 1/4" TRS phone 1 x 1/4" TS phone |
| Phantom Power | +48V |
| Multi Function | No |
| Gain Range | 10dB to 75dB (including +10dB trim) |
| Maximum Output Level | 27dBu (100k? load, 0.1% THD, 1kHz, API Lunchbox) |
| Frequency Response | 3.8Hz to 288kHz, -3.0dB, microphone input @ 40dB gain 8.4Hz to 135kHz, -0.5dB, microphone input @ 40dB gain 1.7Hz to 180kHz, -3.0dB, instrument input @ 20dB gain 4Hz to 72kHz, -0.5dB, instrument input @ 20dB gain |
| Noise | Referred to input @ 60dB gain: <-130dB with 50? source <-128dB with 150? source <-124dB with 600? source |
| Power Requirements | 120mA maximum current required from +16V and -16V power supplies |
| Dimensions (WxDxH) | 1.5 x 6.6 x 5.5" (38 x 168 x 140mm) |
| Weight | 0.7 lbs (316g) |
| Specialties | Ribbon microphone mode raises the input impedance, bypasses the input decoupling capacitors, and deactivates 48V phantom to protect delicate ribbon microphones from damage |
| Packaging Info | |
|---|---|
| Package Weight | 1.65 lb |
| Box Dimensions (LxWxH) | 12.1 x 10.3 x 4.4" |
