Manual
Table Of Contents
- Fig A: Packing List
- Fig B: Power Connections
- Fig C: Mains Lead Table
- Fig 1-1: RB-2S4 Reference Monitor Front Panel
- Fig 1-2: RB-2S10 Reference Monitor Front Panel
- Fig 1-3: Reference Monitor Block Diagram
- Fig 1-4: RM-2S4 Front Panel Controls
- Fig 1-5: RM-2S10 Front Panel Controls
- Fig 1-6: RM-2S4 Source Selector
- Fig 1-7: RM-2S10 Source Selector
- Fig 1-8: RM-2S4 & RM-2S10 Meters
- Fig 1-9: RM-2S4 & RM-2S10 DIPSwitch Settings
- Fig 1-10: Meter Labelling Options
- Fig 1-11: Brightness Control
- Fig 1-13: Balance Control
- Fig 1-12: Phase Meter Display
- Fig 1-14: Status LEDs
- Fig 1-15: RB-2S4 & RB-2S10 Modifier Switches
- Fig 1-16: Reference Monitor RM-2S4 Rear
- Fig 1-17: Reference Monitor RM-2S10 Rear
- Fig 1-18: RM-2S4 & RM-2S10 DIPswitch Settings
- Fig 2-1: RB-4C8 Reference Monitor Front Panel
- Fig 2-2: Reference Monitor Block Diagram
- Fig 2-3: RM-4C8 Front Panel Controls
- Fig 2-4: RM-4C8 Rotary Source Selectors
- Fig 2-5: RM-4C8 Meters
- Fig 2-6: RM-4C8 DIPSwitch Settings
- Fig 2-7: Meter Labelling Options
- Fig 2-8: Brightness Control
- Fig 2-9: Phase Meter Display
- Fig 2-10: Balance Control
- Fig 2-11: Status LEDs
- Fig 2-12: RB-4C8 Modifier Switches
- Fig 2-13: Reference Monitor RM-4C8 Rear
- Fig 3-1: RM-HD1 Expansion Card
- Fig 3-2: RM-HDE1 Expansion Card
- Fig 3-3: Reference Monitor RM-HD(E)1 Block Diagram
- Warranty
- Safety Information
- Installation Information
- Reference Monitors Introduction
- RM-2S4 Reference Monitor, 2 LED meters & 4 stereo
- channel inputs
- RM-2S10 Reference Monitor, 2 LED meters & 10 stereo
- channel inputs
- Technical Specification RM-2S4 & RM-2S10
- RB-4C8 Reference Monitor, 4 LED meters, 8 channel inputs &
- dual selectors
- Technical Specification RM-4C8
- RM-HD1 Reference Monitor HD-SDI Expansion Card &
- RM-HDE1 Reference Monitor HD-SDI & Dolby E Expansion Card
- Technical Specification RM-HD1 & RM-HDE1
- Serial Interface Commands & Responses Protocol
Reference Monitors User Handbook
53
SERIAL INTERFACE
COMMANDS & RESPONSES
SERIAL INTERFACE COMMANDS & RESPONSES
4
User-Variable EQ Parameter Format
The DSP coecients for the user-variable EQ need to be pre-calculated before being sent
to the Reference Monitor.
Each band of EQ is a parametric equaliser with the following parameters:
F = centre frequency in Hz,
BW = bandwidth in octaves
G = height of peak/trough at centre frequency (linear, so 6dB=2.0, 12dB=4.0, etc)
First, the following intermediate values should be calculated:
R = ((2^BW)-1)/(2^(BW/2))
K = tan(pi*F/48000)
A = G – 1
From these, the three coecients M1, M2 and M3 can be calculated. They dier according
to whether boost or cut is required.
If boost is required:
M1 = (A*R*K)/(1+(R*K)+(K^2))
M2 = (4*(K^2))/(1+(R*K)+(K^2))
M3 = (1-(R*K)+(K^2))/(1+(R*K)+(K^2))
If cut is required:
M1 = -(A*R*K)/(1+(G*R*K)+(K^2))
M2 = (4*(K^2))/(1+(G*R*K)+(K^2))
M3 = (1-(G*R*K)+(K^2))/(1+(G*R*K)+(K^2))
The resulting three coecients should then be converted to S3.24 format, i.e. one sign
bit, three integer bits and 24 fractional bits. It is in this format that they are sent to the
Reference Monitor. A ve-byte string (ve hex character pairs) is sent with the coecient
bytes sent MSB rst. The upper nibble of the MSB should be all zeros.
Coecient updates will be applied instantly.