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4-input; 4 output (four microphone preamps) 24-bit/96KHz USB audio interface with direct monitoring and internal AA battery power option.
The new AMS series low-cost audio interfaces from Zoom offer an exceptional value, with very flat frequency response that we've tested to exceed factory specifications and low-noise, high-gain, mic preamps that will result in excellent sensitivity when used with our hydrophones. Each offers full 48V phantom power that is compatible with any of our hydrophones or amplifiers with XLR output.
They are very compact and all can be powered from the USB bus or an external USB battery pack (note that phones and tablets may not provide power to external devices). Additionally, the AMS-24 and AMS-44 can be powered from AA batteries.
Compact and simple headphone amplifier:
With the "Direct Monitor" switch set to "on", these audio interfaces can be used as a simple mic pre/headphone amp for listening to underwater sound without the use of a computer. This "Direct Monitor" switch can also be used as a mute switch for applications like leak finding, where the hydrophone is being moved around a lot. The headphone or 1/4" outputs can also be connected to a line or "AUX" input of a marine stereo or powered speaker.
Audio interface to computer or phone:
When connected by USB to your computer, these will allow you to do real-time spectral analysis or recording using any of hundreds of available applications--many being very low-cost or free. Aquarian does not attempt to evaluate software options and does not sell or support any specific tools. These are also class-compliant audio devices that should work with phones, tablets and development boards, such as Raspberry Pi. Check your cable and power requirements. Performance may be limited to lower sampling rates when used without the Zoom driver.
Included with the AMS-44:
- AMS-44 USB Audio Interface
- USB-C Cable
- Quick Tour
Input and Output Channels
| Number of input channels | Mono (MIC/LINE) | 4 |
| Number of output channels | Stereo (TRS) | 1 |
| Stereo (PHONES) | 2 |
Connectors
| INPUT 1-4 | Type | XLR/TRS combo jacks |
| (XLR: 2 HOT, TRS: TIP HOT) | ||
| Input gain | −∞ – +58 dB / −∞ – +50 dB (when set to GUITAR) | |
| Input impedance | XLR: 2.7 kΩ | |
| TRS: 18 kΩ / 330 kΩ (when set to GUITAR) | ||
| Maximum input level | XLR: +6 dBu | |
| TRS: +22 dBu / +8.5 dBu (when set to GUITAR) | ||
| Phantom power | +48 V | |
| OUTPUT A (standard phone jacks) | Type | TRS phone jacks (impedance balanced) |
| Maximum output level | +10 dBu (at 0 dBFS) | |
| Output impedance | 100 Ω | |
| OUTPUT A–B (headphone jacks) | Type | 3.5mm stereo mini jacks |
| 30 mW + 30 mW (32 Ω load) | ||
| Output impedance | 10 Ω | |
| USB | USB Type-C (audio interface function) | |
| • Use a USB cable that supports data transfer. USB bus power is supported. | ||
| DC 5V | USB Type-C (for power supply) |
Frequency Response
| 44.1 kHz: ±1 dB (20 Hz – 20 kHz) | |
| 96 kHz: ±1.5 dB (20 Hz – 40 kHz) |
Equivalent input noise
| –120 dBu or less (IHF-A) at +58 dB/150Ω input |
Audio interface
| Input and output channels | Recording: 4 channels |
| Playback: 4 channels | |
| Sampling frequencies | 96 kHz, 88.2 kHz, 48 kHz, 44.1 kHz |
| Bit depth | 24-bit |
| Interface | USB 2.0 |
| Class | USB Audio Class 2.0 |
Power
| 2 AA batteries (alkaline, lithium, or rechargeable NiMH) | |
| AC adapter (ZOOM AD-17): DC 5 V/1 A | |
| • USB bus power is supported. |
Rated Current
| USB/AC adapter (5 V): 350 mA | |
| Batteries (2.4 V): 560 mA |
Estimated continuous operation time using batteries
| 44.1 kHz, 48 V off, with 32Ω headphone load | |
| Alkaline batteries: about 3 hours | |
| NiMH batteries (1900 mAh): about 4.5 hours | |
| Lithium batteries: about 8.5 hours | |
| • The above values are approximate. • Continuous battery operation times were determined using in-house testing methods. They could vary greatly according to use conditions. |
Power Consumption
| 5 W maximum |
Dimensions
| 129.0 mm (W) × 74.0 mm (D) × 46.0 mm (H) |
Weight (including batteries)
| 223 g |
AMS-Series System Requirements
| Windows | OS: Windows® 10 / 11 (64bit) |
| CPU: Intel® Core i3 or faster, or AMD Ryzen 3 or faster with Zen architecture* | |
| USB: USB 3.0 / 2.0** | |
| * Operation is not guaranteed with CPUs from Intel® Atom, Celeron or Pentium series or CPUs from AMD Athlon. | |
| ** Only USB host controllers with Intel/AMD Chipsets are supported. Operation is not guaranteed when used with USB hubs or expansion cards. | |
| Mac | OS: Mac® OS X 10.14.6 ~ macOS 12 |
| CPU: Intel® Core i3 or faster, or Apple M1 | |
| USB: USB 3.0 / 2.0* | |
| * Operation is not guaranteed when used with USB hubs or expansion cards. | |
| iPhone / iPad | OS: iOS/iPadOS 13.7 ~ 15 |
| * Apple Lightning-to-USB Camera Adapter required. | |
| Android | OS: Android OS 9 ~ 11 |
| * USB cables and adapters that match the connectors are necessary. | |
| * Please refer to the compatible android device list. |