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Analog Input Card

Overview​

Analog Input Card

Allows HBPRO Hub to input signal from any professional analog audio equipment. Provides (8) balanced audio inputs using a standard Tascam DA-88-style pin-out on a DB25 connector. A DB25 to 1/4-inch TRS break-out cable is sold separately, unless the Analog input card is purchased as part of the Hear Back PRO Four Pack.

The 8 channels can come from an audio mixer via auxilliary, matrix, monitor, and/or direct outputs.

caution

Use only DA-88 Analog. Do not use TDIF.

DA-88 Analog

Advantages / Features​

  • -10dB pad on each channel allows the user to select +8dB or +18dB maximum input sensitivity level
  • Custom input sensitivities available up to +34dB upon special request
  • User configurable sampling rates of 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz, and 192kHz using jumpers
  • (2) analog input cards are required to input 16 channels of audio
  • Up to (4) cards can be populated per Hub to allow A/B input / clock switching between (2) banks of 16 channels with FW V2 or 32 simultaneous channels with all later versions

Selecting Sampling Rate​

The Analog Input Card lets users select the digital sampling rate they wish to convert their analog audio to via three jumpers located directly under the Hear Technologies logo on the Analog Card circuit board. Jumper positions can be configured as shown below, where the blacked-out boxes represent an electrical connection between pins:

Sample Rates
note

The jumpers affect the sampling rate only when the card is selected as the input. Other Analog Cards will follow that clock. For example, if input A is selected, only the jumpers on the card in slot 1 are used. When using digital input cards simultaneously, select the digital card as the input to keep the clock synchronized and avoid pops and clicks.

-10dB Pad​

The Analog Input Card provides 2 jumpers per channel (16 total) that can be removed to achieve a -10dB pad per channel. These jumpers are labeled 1-8 (corresponding to each input channel), and located one inch away from the DB-25 connector. So, in this example, input channels 1 & 4 will be reduced by 10dB, while input channels 2 & 3 are at 0dB:

-10 dB Pad

Installation​

Analog Input Card Drawing

The Analog Input Card is designed to use in multiples. The cards must be placed side-by-side, commonly in slots 1 & 2 with select switch at position "A".

For V5 FW and above, additional Analog Input cards may be added to achieve 24 and 32 total channels, depending on how many slots are available in the PRO Hub. Up to 16 Analog Input Cards can be populated into 4 Hubs totaling 128 channels.

Technical Specifications​

System Input​

Hub Line In:

8 Balanced inputs on DB-25 female (DA-88 pinout)

Hub Maximum Input Level:

+2 dBu with analog card pad jumpers populated, +12dBu with jumpers removed (up to +28dBu upon special request)

Sampling Rates:

Supports 44.1kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz, and 192kHz

Input Connector:

DB25 with standard TASCAM DA-88 pin-out