Features

Overview: The Alpine HDP-D90 Hi-Resolution Digital Sound Processor/Amplifier lets you integrate aftermarket amplifiers and speakers into your vehicle without replacing the factory headunit. The processor/amplifier can also be used with any aftermarket head unit. The HDP-D90 features 10-band parametric or graphic EQ on each input channel and 31-band parametric or graphic EQ on each output. Combined with high- and low-pass filters as well as time correction for each channel, the HDP-D90 offers unprecedented tone shaping control. The Alpine processor features 12-channels of high-level input from your factory or aftermarket head unit, along with 2-channels via RCA, Optical, or Coax digital inputs. Outputs include 10 preamp outputs and 12 amplified outputs, all assignable via a mixing matrix. The HDP-D90 can connect to a Windows PC via USB for making all of your adjustments. A Bluetooth adapter is included for streaming Bluetooth audio to the HDP-D90.

Inputs & Outputs

Inputs: The Alpine processor features 14 speaker-level inputs that can accept either low-level signals up to 8V or high-level signals up to 26V. In addition, the HDP-D90 includes an additional 2 input channels via a pair of RCA jacks, optical (Toslink), and a coaxial (RCA) S/PDIF digital input, letting you play music from an in-vehicle CD or DVD player. An included external Bluetooth module lets you stream audio from your smartphone or tablet. The RCA, optical, coaxial, and Bluetooth inputs can be blended in with the output signal via a Mix page in the PC Software. These range from a simple 2-channel input all the way up to more complex 14-channel input configurations, allowing individual tweeter, midrange, and woofer inputs to be matrixed to any of the outputs. Input channels can be Linked together when using stereo inputs, allowing channel settings to be applied to both simultaneously.

Outputs: The HDP-D90 includes 10 pre-amp level output channels for running to outboard amplifiers (sold separately). Twelve high-level outputs can provide the following output power to your speakers (rated @ 4-ohms, 14.4V, 10% THD):

• Channels 1-8: 50W RMS x 8
• Channels 9-12: 80W RMS x 4
• Channels 9-12 (bridged): 160W RMS x 2

DSP

Processing: The HDP-D90 features a sampling rate of 192kHz/32-bit for internal signal processing, and 192kHz/24-bit Hi-Res audio playback resolution. The processor/amplifier also has a S/N ratio of >110dB with <0.001% THD, and ultra-wide internal audio processing bandwidth of 10Hz-110kHz (output frequency response is 20Hz-40kHz).

User Interface Options: The Alpine HDP-D90 Digital Sound Processor can be controlled two different ways:

• PC Software: You can connect a PC to the processor via the included USB-A to USB-B cable. The software allows you to adjust the Master Volume, assign inputs via the Matrix Input Summing page, switch the Output Channels, set the EQ curve, Q-value, and Frequency Tuning, along with setting the Crossovers, Delay, and Audio Output Mixing . The PC software runs on Windows versions XP, Vista, 7, 8, and 10 (Mac not supported).
• Optional Controllers: The HDP-D90 can be connected to and controlled by Alpine's optional HDS-990 Hi-Res Digital Media Player (sold separately). The HDS-990 connects to the HDP-D90 via an optical or coax digital connection for pristine audio processing and playback. The HDP-D90 can also be controlled using the optional Alpine RUX-C810 stand-alone controller (sold separately). The RUX-C810 lets you adjust the volume and bass levels, select main and auxiliary input sources, and recall customized sound Presets.

Equalization: The HDP-D90 features 10-bands of graphic or parametric EQ for each input channel, and 31-bands of graphic or parametric EQ per output channel.

• Input EQ:
  • Parametric: Each of the 10 selectable bands features a frequency adjustment range from 20Hz -20kHz with 1Hz increments. Each selected band includes a Q adjustment that ranges from 0.404 (narrowest) up to 28.852 (widest). A gain adjustment for each band has a range of +12dB to -12dB.
  • Graphic: The graphic EQ includes 10 fixed frequency bands at: 31Hz, 65Hz, 125Hz, 250Hz, 500Hz, 1kHz, 2kHz, 4kHz, 8kHz, and 16kHz. Each band has a fixed Q at 1.007 and a level range from +12dB to -12dB.
• Output EQ:
  • Parametric: Each of the 31 selectable bands features a frequency adjustment range from 20Hz -20kHz with 1Hz increments. Each selected band includes a Q adjustment that ranges from 0.404 (narrowest) up to 28.852 (widest). A gain adjustment for each band has a range of +12dB to -12dB.
  • Graphic: The output graphic EQ includes 31 fixed frequency bands at: 20Hz, 25Hz, 32Hz, 40Hz, 50Hz, 63Hz, 80Hz, 100Hz, 125Hz, 160Hz, 200Hz, 250Hz, 315Hz, 400Hz, 500Hz, 630Hz, 800Hz, 1kHz, 1.25kHz, 1.6kHz, 2.0kHz, 2.5kHz, 3.15kHz, 4kHz, 5kHz, 6.3kHz, 8kHz, 10kHz, 12.5kHz, 16kHz, and 20kHz. Each band has a fixed Q at 1.007 and a level range from +12dB to -12dB.

Crossovers: Each input and output channel is equipped with independent high- and low-pass filters. Bandpass filters can also be configured. For each channel, you can select the type of filter - Butterworth, Linkwitz-Riley, or Bessel. Crossover points are fully adjustable from 20Hz to 20kHz in 1Hz increments. You can choose from the following crossover slopes: 6dB, 12dB, 18dB, 24dB, 30dB, 36dB, 42dB, or 48dB per octave.

Time Correction/Phase: The HDP-D90 can apply a wide degree of time correction to each of the 16 output channels, with a delay time ranging from 0.0 to 20 milliseconds. The phase of each output can be set to positive (0°) or inverted (180°).

Built-In RTA: The Alpine HDP-D90 features a built-in RTA (Real-Time Analyzer) that provides a visual representation of the audio input frequency spectrum for each individual channel. The RTA, along with embedded sine wave test signals, lets you address specific frequencies that may need to be lowered or boosted for a balanced frequency response.

Presets: After you have set the EQ frequency, Q-value, and gain data, delay, channel, and phase position settings to your liking, you can save them to one of up to 6 different sound Presets. This allows you to make different sound settings for each input type or music genre. Presets can be quickly selected using the PC software or using an optional Alpine HDS-990 Digital Media Player or RUX-810 controller (both sold separately).

Auto Turn-On: The Alpine HDP-D90 can use a high-level signal on the input wires to power the processor/amplifier on and off. In addition, a Remote In terminal can be used to activate the unit from a remote output on an aftermarket headunit. A corresponding 2-way slide-switch (ACC/HOST) determines the turn-on method. The HDP-D90 also includes a Remote Out wire on the speaker-level input harness that can be used to activate additional outboard amplifiers. The Remote Out wire can provide 200mA of current; if multiple amplifiers will be connected, a 12V relay may be required to step up the current and is sold separately.

Bluetooth Audio Streaming: The HDP-D90 includes a Bluetooth audio streaming module, with attached 6" cable, that lets you stream audio from your Bluetooth-enabled device to the processor/amplifier.

Connections & Specifications

Input Connections:

• Power/Ground/Rem: Power, ground, and remote turn-on inputs use set-screw connections with power and ground accepting 0/1-gauge wire (4-gauge recommended); the remote terminal can accept wire up to 4-gauge.
• Fuses: The HDP-D90 is protected by two 35A ATO fuses installed in the chassis.
• Speaker-Level Inputs: A 26-pin harness (22-gauge wire) houses the 12 speaker-level input channels and the Remote Output for triggering additional amplifiers.
• Digital & Analog Inputs: Optical and coaxial digital inputs, along with a pair of RCA low-level inputs, can be freely assigned in the input matrix as additional input signals, each accepting 2-channel audio.

  Note: Only one digital input (optical or coax) can be used at a time.

Output Connections:

• Low-Level Outputs: Ten RCA jacks provide the low-level outputs for running to additional outboard amplifiers.
• Speaker-Level Outputs: Twelve pairs of set-screw terminals comprise the amplified outputs, each accepting speaker wire up to 8-gauge. Channels 1-8 can provide up to 50W RMS, while channels 9-12 can provide up to 80W RMS or 160W RMS x 2 channels bridged (@ 4Ω).

Additional Connections:

• RJ-45: This port is used to connect the included Bluetooth adapter for Bluetooth audio steaming.
• RJ-14: Lets you connect an optional Alpine controller or media player (both sold separately).
• USB-B: A USB port provides the connection to your PC computer for setup and configuration. A 5' USB (type-A to type-B) is provided.

Specifications:

• Frequency Response: 20Hz-40kHz
• Signal-to-Noise Ratio: =100dB
• Total Harmonic Distortion: =0.01%
• Input Impedance:
  • Low-level: 10kΩ
  • High-level: 14Ω
• System Sampling Rate:
  • Internal Processing: 192kHz/32-bit
  • Hi-Res Audio Playback: 192kHz/24-bit
• Power Source: 9-16VDC
• Standby Power Consumption: =0.1W
• Processor/Amplifier Dimensions: Width = 10.95" Height = 2.30" Depth = 10.50"
• Bluetooth Module Dimensions: Width = 3.95" (including cord), Height = 0.48", Depth = 1.26"
• Weight: 9.92 lbs.