Rear Panel DIP Switches
Rear Panel DIP Switch Controls
The rear panel of the Hx1 and Hx2 chassis contain two banks of DIP switches labeled "Settings" and "Options."
The "Settings" switches (SW1) control the operational levels of various signal processing stages. The "Options" switches (SW2) are used to configure various features. The tables below explain the individual DIP switches:
Settings | Function |
Bits 1 and 2 | EQ LO, fixed dB gain adjustment |
Bits 3 and 4 | EQ HI, fixed dB gain adjustment |
Bits 5 and 6 | Ducking dB gain adjustment |
Bits 7 and 8 | AGC and Noise Gate settings |
Options | Functions |
Bits 1 and 2 | DDEQ configuration |
Bits 3 and 4 | Auto-answer configuration |
Bit 5 | Send gain to phone |
Bit 6 | Hx2 internal mix-minus enable |
Bit 7 | Feedback Reduction enabled |
Bit 8 | Reserved |
Dynamic Digital Equalization Configuration Settings
Options Bits 1 and 2 control the overall operation of the DDEQ processing function. Selections include OFF, Fixed EQ, Adaptive EQ, or Adaptive + Fixed EQ. See the Digital Dynamic Equalization section for an explanation of each.
Bit 1 | Bit 2 | Setting Value |
OFF | OFF | DDEQ turned OFF |
OFF | ON | DDEQ enabled in Fixed EQ mode (use SETTINGS Bits 1-4 to set levels) |
ON | OFF | DDEQ enabled in Adaptive EQ mode (factory default setting) |
ON | ON | DDEQ enabled in Adapt + EQ mode (use SETTINGS Bits 1-4 to set levels) |
You can separately specify the level of adjustment in the EQ HI and EQ LO frequency bands when the DDEQ mode is configured for Fixed EQ mode. SETTINGS Bits #1 and #2 control the dB adjustment for the EQ HI band, and Bits #3 and #4 control the dB adjustment for the EQ LO band as follows:
SETTINGS
Bit 1 | Bit 2 | Setting Value |
OFF | OFF | EQ LO, 0 dB adjustment (factory default setting) |
OFF | ON | EQ LO, +2 dB adjustment |
ON | OFF | EQ LO, +4 dB adjustment |
ON | ON | EQ LO, +6 dB adjustment |
SETTINGS
Bit 3 | Bit 4 | Setting Value |
OFF | OFF | EQ HI, 0 dB adjustment (factory default setting) |
OFF | ON | EQ HI, +2 dB adjustment |
ON | OFF | EQ HI, +4 dB adjustment |
ON | ON | EQ HI, +6 dB adjustment |
We encourage you to try varying levels of EQ boost to make your telephone audio sound warmer and clearer. Our factory default settings should be considered a safe starting point, but because tastes and situations differ, we don’t presume to make those choices for you. Our testing does suggest that utilizing the full 6 db boost works well in most cases and dramatically enhances telephone audio, but we suggest that you set up your phones like you would any other audio processing device: Adjust, listen critically, and repeat the process until you’re satisfied.
Ducker Configuration Settings
SETTINGS Bits #5 and #6 control the overall operation of the Ducker processing function. See the Ducking system section for an explanation of each setting, including full-duplex (no ducking), -6 dB, -12 dB, or half-duplex (one way at a time).
SETTINGS
Bit 5 | Bit 6 | Setting Value |
OFF | OFF | Full Duplex (no attenuation) |
OFF | ON | -6 dB attenuation (factory default setting) |
ON | OFF | -12 dB attenuation |
ON | ON | Half Duplex |
Receive AGC and Noise Gate Settings
SETTINGS Bits #7 and #8 jointly control the operation of the receive AGC and Noise Gate processing functions. You can select how aggressively low-level signals are brought up to the nominal (+4 dBu) level using the following bit settings:
SETTINGS
Bit 7 | Bit 8 | AGC Setting Value | Noise Gate Setting Value |
OFF | OFF | Phone AGC = OFF | Noise Gate = OFF |
OFF | ON | Phone AGC = 1/2 Full | Noise Gate = OFF |
ON | OFF | Phone AGC = Full | Noise Gate = OFF (factory default setting) |
ON | ON | Phone AGC = Full | Noise Gate = Normal |
Auto-Answer Configuration Settings
OPTIONS Bits #3 and #4 jointly control the operation of the Auto-Answer feature of the hybrid. You can select between turning the feature off, or set the number of rings before the incoming call is answered and then placed on air as follows:
OPTIONS
Bit 3 | Bit 4 | Auto-Answer Setting Value | Ring Setting Value |
OFF | OFF | Auto-answer = OFF | Disabled (factory default setting) |
OFF | ON | Auto-answer = ON | Auto-answer after first ring |
ON | OFF | Auto-answer = ON | Auto-answer after third ring |
ON | ON | Auto-answer = ON | Auto-answer after eighth ring |
Send Extra Gain to Caller Configuration Setting
The Hx1 and Hx2 hybrid units have been designed to send a -9 dBu average level to the telephone line in order to meet the USA’s FCC regulations. OPTION Bit #5 adds 3 dB of gain to the send level heard by the caller. This should only be used when the hybrid is connected to a PBX or in countries outside of the USA that permit a higher transmit level.
OPTIONS
Bit 5 | Setting Value |
OFF | No additional gain applied (factory default setting) |
ON | +3 dB additional gain applied to audio sent to the caller |
Hx2 Internal Mix-Minus Configuration Setting
The Hx2 can operate as two independent hybrids or be configured to perform an internal mix- minus between the two hybrids.
Bit 6 | Setting Value |
OFF | Independent - Internal mix-minus disabled (factory default setting) |
ON | Coupled - Internal mix-minus enabled |
Feedback Reduction
The Hx 1 and Hx2 have an optional Acoustic Echo Canceler in the Studio send path. This can be used when there is acoustic coupling between a loudspeaker connected to the hybrid output and a microphone connected to the input. Enabling feedback reduction also causes the ducker to insert more loss into the announcer-to-caller direction when the caller is dominant.
Bit 7 | Setting Value |
OFF | Acoustic Echo Canceler disabled (factory default setting) |
ON | Acoustic Echo Canceler enabled (use in "open speaker" situation) |
Reserved Bit
OPTIONS Bit #8 is set aside as RESERVED for future use.
OPTIONS
Bit 8 | Setting Value |
OFF | Reserved for future use (factory default setting) |
ON | Not recommended |
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