ST-NPA70DP Dante Audio Amplifier | 2x35W Class D Amp

ST-NPA70DP Dante Audio Amplifier is a professional 2x35W Class D amplifier with Dante® and AES67 networking, balanced Line/Mic inputs, DSP processing, 48V phantom power, RS-232, TCP/IP and Web GUI control. It is designed for commercial AV installations requiring reliable, high-quality audio performance.

The ST-NPA70DP Dante Audio Amplifier supports Dante® and AES67 digital audio networking for professional AV applications.

The ST-NPA70DP Dante Audio Amplifier includes advanced DSP features such as gain, mixing, matrixing, equalizer, volume and delay control.

The ST-NPA70DP Dante Audio Amplifier is ideal for conference rooms, classrooms, hospitality, retail, and corporate AV installations.

Features

☆ Advanced 70W Class-D audio amplifier with Dante® integration
☆ 2x 35W@4/8ohm, 1x 70W@4/8ohm
☆ Dante® 2x2 and AES67 audio input/output supported
☆ Balanced/unbalanced analog input and output for cascading connection
☆ Dante® 2CH digital audio, balanced or unbalanced line level analog and AMP outputs
☆ Supports microphone input with 48V phantom power
☆ Audio DSP processing includes gain, ducking, mixing, matrixing, equalizer, volume and delay control
☆ Audio output supports 8 band PEQ adjustment (with +15dB/-15dB gain), and a maximum of 50ms delay setting
☆ Auto standby mode (0~100 minutes can be set) with signal sensing
☆ Local 5-12V input trigger for disabling amplifier output
☆ Integrated web page function, which can control the local machine and query the working status of the product through the web page
☆ Supports network control function, slave devices in the same network segment can be controlled through the set host
☆ Dante audio support: 44.1kHz, 48kHz, 88.2kHz, and 96kHz sampling rates @ 16/24bit
☆ Dante audio delay supports settings of 2, 3, 4, 5 or 10ms
☆ Flexible control via front panel buttons, RS-232, TCP/IP and Web GUI
☆ Power via PoE or local DC power supply (Amplifier power limited when using PoE)

Package Contents

① 1x 2x35W Class D Audio Amplifier
② 2x 6pin-3.5mm Phoenix Connector (male)
③ 1x 5pin-3.5mm Phoenix Connector (male)
④ 1x 4pin-5.08mm Phoenix Connector (male)
⑤ 2x Mounting Ear
⑥ 4x Machine Screw
⑦ 1x 36V/2.5A Multinational Power Supply (1.5 meters)
⑧ 1x User Manual

Specifications

Technical
Network Bandwidth	100M
Audio Format	Dante® [Dante/AES67 digital audio in/out, PCM 2CH 44.1K-96kHz 16/24Bit] LINE IN [Analog audio, Balanced/unbalanced, Max input level 24dBu] MIC IN [Analog audio, Balanced/unbalanced, Min input level -35dBV] LINE OUT [Analog audio, Balanced/unbalanced, Max output level 2V RMS] AMP OUT [Analog audio, Balanced 2CH, Max output power 2x35W@4/8ohm Stereo, 1x70W@4/8ohm Mono]
Output Power	2x35W@4/8ohm Stereo, 1x70W@4/8ohm Mono
Amplifier Type	Class D
Transmission Distance	328ft/100m (CAT6/6A/7)
Output Level	Max 2V RMS @ balanced audio Max 2V RMS @ unbalanced audio
Audio THD+N	< 0.01% at +4dBu, 1KHz
Audio S/N Ratio	>100dB@0dBu, 1kHzA-weighted
Frequency Response	20Hz to 20kHz (-/+0.5dB)
Dynamic Range	>100dB@0dBu, 1kHzA-weighted
Input Level	Max 24dBu (12.28Vrms) @ balanced line audio Max 18dBu (6.14Vrms) @ unbalanced line audio Min -35dBV (17.78mVrms) @ balanced mic audio
Input Impedance	20K Ohm balanced 10K Ohm unbalanced
Output Impedance	600 Ohm balanced 300 Ohm unbalanced
Audio Output Delay	<1ms
Audio Latency	Configurable Dante® device latency: (Supports 2, 3, 4, 5 or 10ms configurable using Dante Controller) Configurable AMP/analogue output latency: (0~50ms)
ESD Protection	IEC 61000-4-2: ±8kV (Air-gap discharge), ±4kV (Contact discharge)
Connection
Input	1x MIC/LINE IN [6pin-3.5mm phoenix connector]
Output	1x LINE OUT [6pin-3.5mm phoenix connector] 1x 4/8Ω AMP OUT [4pin-5.08mm locking phoenix connector]
Control	1x RS-232 [3pin-3.5mm phoenix connector, API commands control] 1x TRIGGER [2pin-3.5mm phoenix connector, high/Low level configurable to disable amp out] 1x DANTE/IP [RJ45 connector, PoE+/PD (Class 8 IEEE 802.3bt)] [Dante/AES67, Web GUI and TCP/IP]
Mechanical
Housing	Metal Enclosure
Color	Black
Dimensions	180mm [W] × 118mm [D] × 28mm [H]
Weight	670g
Power Supply	(1) 36V/2.5A 4PIN Locking Power Supply (2) PoE++ Type 4 Class 8
Power Consumption (Max)	94.6W (Test with 1k sine wave, audio amplifier output is connected to 4Ω resistance)
Operating Temperature	0°C ~ 40°C / 32°F ~ 104°F
Storage Temperature	-20°C ~ 60°C / -4°F ~ 140°F
Operating Humidity	20%~80% (relative humidity, non-condensing)
Storage Humidity	10%~90% (relative humidity, non-condensing)

Operation Controls and Functions

Front Panel

No.	Name	Function Description
1	Power LED	Green ON: The system is powered up (PoE or DC power supply). Red ON: The system is in standby mode. OFF: The system is powered off.
2	ID (show me) LED	This LED indicates the presence of the product. Flash: Device identification OFF: No device identification It can be controlled through Web GUI or API command. For example, when selecting the "On" option for "DANTE Identification" on the System page of the Web GUI, the ID (show me) LED on the front panel will flash, so that you can find the corresponding machine in the system.
3	LINE/DANTE LED	Input signal source indicators. When the DANTE or LINE IN port detects signal input, the corresponding green DANTE/LINE LED will be on.
4	LCD screen	The LCD screen displays the status information of the product. With menu buttons operation, the user can query the software version, or set the input gain, DHCP on/off, output audio volume.
5	MENU button	Used to query/set various function of the product, including input gain adjustment, network setting, output audio volume adjustment, software version query.
6	UP button	Press the UP button to select the previous item.
7	DOWN button	Press the DOWN button to select the next item.
8	ENTER button	Press the ENTER button to confirm and execute the operation.

Rear Panel

No.	Name	Function Description
1	DANTE port	Dante® network port, supporting PoE, with the following two functions: (1) Dante® audio input and output port. (2) Web GUI and TCP/IP control port.
2	RS-232 / TRG Port	RS-232: Serial control port, used for RS-232 signal pass-through or controlling this product via API commands. TRG: Trigger signal input port, effective at rising edge voltage and falling edge voltage. When the input trigger is detected, the amplifier will enter the protected mode (mute the audio). For details, please refer to the input trigger settings on the System page of Web GUI.
3	48V Phantom Power LEDs	Two 48V Phantom power indicators. Green ON: Phantom power on. OFF: Phantom power off.
4	MIC/LINE INPUTS Port	LINE analogue audio input port, supporting balanced/unbalanced 2CH, with a Max input level of 24dBu. MIC analogue audio input port, supporting balanced/unbalanced 2CH, with a Min input level of -35dBV.
5	LINE OUTPUTS Port	LINE analogue audio output port, supporting balanced/unbalanced 2CH, with a Max output level of 2V RMS.
6	AMP OUT Port	Analogue audio output port, supporting balanced 2CH, with Max output power 2x35W@4/8ohm Stereo, 1x70W@4/8ohm Mono. 1+/1- and 2+/2- are for Low Impedance (4/8ohm) Stereo Speakers. 1+/1- is for Low Impedance (4/8ohm) Mono Speaker.
7	AMP Output Mode DIP Switch	Speaker Lo-Z Impedance Select: Toggle up the left switch to connect the 4Ω speaker, or toggle down the left switch to connect the 8Ω speaker. Speaker Lo-Z Connection Select: Toggle up the right switch for stereo dual channel output, or toggle down for bridged mono output.
8	RESET Button	Short press this button to reset the product. Press and hold this button for 3 seconds to restore to factory default settings (excluding the network). Press and hold this button for 10 seconds to restore to factory default settings (including the network).
9	DC 36V IN	DC 36V/2.5A power input port.

Audio Amplifier Output

The audio amplifier can output the same power at both 4 ohms and 8 ohms. The amplifier output power varies depending on the input power supply or PoE adapter connected to it, it does this by adjusting the internal gain to allow you to get most of the amplifier. Please ensure that you select the correct impedance option via the speaker impedance selection switch on the rear of the device.

Speaker Connections

The audio amplifier only supports Low Impedance (4-8ohm) speakers. It is necessary to configure the Speaker Impedance Switch as well as wire up the speakers according to the specific speakers you are using. Wiring examples for each of the available configurations are as follows:

Low Impedance (4/8ohm) Stereo Speakers:
Speaker Lo-Z Impedance Select: [0] = 4Ω, [1] = 8Ω
Speaker Lo-Z Connection Select: [0] = STEREO

Low Impedance (4/8ohm) Mono Speaker:
Speaker Lo-Z Impedance Select: [0] = 4Ω, [1] = 8Ω
Speaker Lo-Z Connection Select: [1] = MONO

RS-232 Control Command

The product also supports RS-232 command control. Connect the RS-232 port of the product to a PC with a 3-pin phoenix connector cable and an RS-232 to USB cable. The connection method is as follows.

Application Example

ApplicationsThe ST-NPA70DP Dante Audio Amplifier is designed for conference rooms, boardrooms, classrooms, hotels, retail stores, restaurants, houses of worship, and commercial AV installations.The ST-NPA70DP Dante Audio Amplifier delivers reliable 2x35W Class D amplification with Dante® and AES67 digital audio networking for professional audio distribution.The ST-NPA70DP Dante Audio Amplifier supports balanced Line and Mic inputs, 48V phantom power, advanced DSP processing, RS-232, TCP/IP and Web GUI control.The ST-NPA70DP Dante Audio Amplifier provides excellent sound quality for low-impedance 4Ω and 8Ω speaker systems.The ST-NPA70DP Dante Audio Amplifier is suitable for audio matrix systems, paging systems, meeting rooms and education environments.The ST-NPA70DP Dante Audio Amplifier integrates seamlessly with Dante® networks and offers flexible installation for professional AV applications.The ST-NPA70DP Dante Audio Amplifier supports DSP features including gain, mixing, matrixing, equalizer, volume and delay control.The ST-NPA70DP Dante Audio Amplifier is an ideal solution for commercial sound reinforcement where high-quality network audio is required.The ST-NPA70DP Dante Audio Amplifier combines Class D efficiency, Dante networking and flexible control for modern AV installations.The ST-NPA70DP Dante Audio Amplifier is engineered for reliable performance, easy integration and professional audio distribution.