RDL HD-MA35U – 35 W Mixer Amplifier, 4/8 Ohm
RDL HD-MA35U – 35 W Mixer Amplifier, 4/8 Ohm is backordered and will ship as soon as it is back in stock.
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RDL HD-MA35U – 35 W Mixer Amplifier, 4/8 Ohm
What is the RDL HD-MA35U?
The RDL HD-MA35U is a four-input mixer amplifier that drives 4 Ω or 8 Ω speakers with 35 W from a high-efficiency Class D stage. It is designed for background music with paging and music-on-hold, and adds a second 4 W zone for a small area. Front-panel level and tone controls give users direct control, while the master level can also be adjusted from an RDL remote or a 0 to 10 Vdc control. It fits offices, retail spaces, waiting areas and small meeting rooms that need paging and background music from one compact unit.
How does it work?
The Zone 1 mixer sits on the front panel with four input level controls plus bass and treble controls that can also be switched to affect the line output. The Zone 1 output drives 4 Ω or 8 Ω loudspeakers, selected by a rear-panel switch, at 35 W RMS into 4 Ω or 32 W into 8 Ω. Master volume is VCA controlled through an RJ45 port that works with RDL remote controls such as the RDL D-RLC10KM, or with standard 0 to 10 Vdc or 10 kΩ controls. The Zone 2 mixer on the rear panel uses installer-set trimmers. Inputs 1 and 2 are switch-selectable for mic or line level with switchable 24 V phantom, and Input 1 has a transformer-isolated line input with push-to-talk terminals and an adjustable VOX circuit. Paging on Input 1 can duck inputs 2, 3 and/or 4 by 25 dB, with a rear-panel trimmer that delays the fade-up from 2 to 6 seconds. Inputs 3 and 4 accept unbalanced mono or stereo line sources on RCA jacks. Zone 2 adds a 4 W amplifier for an 8 Ω speaker, a 600 Ω transformer-balanced music-on-hold output and a balanced line output that can feed another amplifier. The mixer and amplifiers enter standby sleep mode when audio is absent and draw less than 1 W, waking about 2 seconds after audio returns. The HD-MA35U is engineered, tested and manufactured in the U.S.A. and includes its power supply.
What are the key features?
- Two amplifier zones — Zone 1 delivers 35 W into 4 Ω (32 W into 8 Ω) and Zone 2 delivers 4 W into 8 Ω for a second area.
- Paging priority ducking — Automatic VOX or contact-closure paging on Input 1 ducks other inputs by 25 dB.
- Music-on-hold output — A 600 Ω transformer-isolated output feeds telephone systems.
- Bass and treble controls — Front-panel tone controls with center detent shape the Zone 1 sound.
- Energy-saving sleep mode — Standby consumption is below 1 W including the supplied power supply.
- Remote master volume — An RJ45 VCA port accepts RDL remote controls or 0 to 10 Vdc control.
Where is it typically used?
- Commercial meeting space
- Conference room
- Multi-purpose room
- Training room
- Government space
Technical Specifications
| Model | HD-MA35U |
| Ducking/Muting Actuation | Automatic (Input 1 VOX: rear-panel adjustable signal threshold with LED indicator) or Manual (contact closure to ground) |
| Phantom Voltage | 24 Vdc (IEC 61938: 2013), switch-selectable for each mic input |
| Maximum Input Level | Mic Inputs: -9 dBu; Balanced line inputs: + 20 dBu; Unbalanced Inputs: + 5 dBV (+11 dBV, one input); (for 1% THD+N at output) |
| Gain Adjustments (2) | Inputs 1 and 2: Rear-panel single-turn trimmer |
| Audio Inputs (5) | 2, balanced, mic or line switch selectable on terminal blocks; 2, unbalanced stereo summing inputs on RCA jacks; 1, unbalanced amp in on RCA jack |
| Amplifier Zones (2) | Zone 1 (Main): 35 W RMS, front-panel mixer (user controls); Zone 2: 4 W RMS (8 Ohms), rear-panel mixer (trimmers) |
| Ducking/Muting Release Delay | Rear-panel single-turn trimmer, adjustable 2 to 6 seconds |
| Ducking/Muting | Switch-selectable for inputs 2, 3 and/or 4, 25 dB ducking attenuation, nominal |
| Effects Loop | Unbalanced RCA jacks (preamp output from main mixer, input to power amplifier) |
| External RDL Module Power Output | 24 Vdc, 100 mA maximum, ground-referenced |
| Noise (line or amplified outputs) | Mic or Balanced line inputs: -70 dB (below compressor threshold at max gain); Unbalanced Inputs: <-75 dB (max gain) |
| THD+N | < 0.5% (1 kHz at compressor threshold, main amp output); < 0.1% (line output, main) |
| CMRR | Mic inputs: > 50 dB (50 Hz to 120 Hz); Balanced line inputs: > 80 dB (50 Hz to 120 Hz, transformer-coupled input) |
| Compressor | Threshold 2 dB below rated output, automatically adjusting attack and release times |
| Frequency Response (mixer) | Mic to line output: ±1.5 dB (40 Hz to 25 kHz); Balanced line input to line output: ±1 dB (20 Hz to 20 kHz); Unbalanced line input to line output: ±0.5 dB (20 Hz to 20 kHz) |
| Frequency Response (amplifiers) | ± 1 dB (50 Hz to 20 kHz) |
| Tone Controls | ±10 dB @ 10 kHz, ±9 dB @ 100 Hz (front-panel) with center detent |
| Audio Outputs (2) | -10 dBV nominal (316 mV), dual mono unbalanced RCA (main mixer; FLAT or EQUALIZED, switch-selectable on rear panel); 0 dBu nominal balanced, terminal block (zone 2 mixer) |
| MOH Output | 0 dBu nominal (775 mV), 600 Ohm transformer-isolated, 16 dB headroom |
| Power Amplifier Outputs (2) | Zone 1 (main, <1% THD+N): 35 W RMS (4 Ohms), 32 W (8 Ohms) on detachable terminal block (switch-selectable 4 or 8 Ohm impedance); Zone 2: 4 W (8 Ohms, on detachable terminal block) |
| Indicators (9) | Front-panel: Signal present (4; 1 per input, green), Compressor activity (red), Power (bright=on, dim=standby, blue); Rear-panel: dual-LED VU meter (for inputs 1 and 2, green/red), Ducking/muting threshold (yellow) |
| VCA | Zone 1 (main) master level (with switch-selectable input 1 bypass), 0 to 10 Vdc control, RJ45 (compatible with RDL VCA wall controls) |
| Front-panel controls (7) | Zone 1 (main) mixer level controls (4, inputs 1 through 4), EQ (2, bass and treble), Power (momentary pushbutton, toggle on/standby) |
| Efficiency Standard | “Energy Star® Program Requirements for Audio/Video” Version 2.0 |
| Sleep Mode Power Consumption | < 1 W (amplifier and included power supply) |
| Sleep Mode Delay | 10 minutes to 2 hours (switch-selectable in 10 minute increments) |
| Sleep Mode Disable | Selectable |
| Active Mode Delay | 2 seconds (nominal) after input audio detected |
| Audio Detector Threshold | -80 dBu mic (at max input gain), -55 dBu balanced line (at max input gain), -42 dBV unbalanced |
| Ambient Operating Environment | 32°F (0°C) to 122°F (50°C) Maximum; 68°F (20°C) Recommended |
| Power Supply (included) | 100 to 240 Vac, 50-60 Hz, 50 W; 24 Vdc output to amplifier chassis |
| Dimensions and Weight | Height: 3.5 in.(8.89 cm); Width: 8.5 in.(21.6 cm); Depth: 10 in.(25.4 cm); Weight: 5.6 lb.(2.5 kg) |
Frequently Asked Questions
Which loudspeakers can the HD-MA35U drive?
Zone 1 drives 4 Ω or 8 Ω speakers, switch-selectable on the rear panel. Zone 2 drives an 8 Ω speaker and/or 600 Ω telephone equipment. For 25 V, 70 V or 100 V systems, see the HD-MA35UA.
Which remote controls can adjust the volume?
RDL lists the D-RLC10K, D-RLC10KM, DS-RLC10K and DS-RLC10KM. The VCA input also accepts 0 to 10 Vdc or 10 kΩ controls.
Does it support paging?
Yes. Input 1 has push-to-talk terminals and a VOX circuit that duck inputs 2, 3 and/or 4 by 25 dB during a page.
Is the power supply included?
Yes. The included supply accepts 100 to 240 Vac, 50-60 Hz. RDL lists the PS-24V3A (USA) and PS-24V3 (International).
How much power does it use in standby?
Less than 1 W including the included power supply, meeting the Energy Star Audio/Video Version 2.0 requirements.
How can it be mounted?
RDL lists the HD-RA2 and HD-HRA1 rack adapters, HD-WM1 wall mount, HD-ASC1, HD-BP1 and HD-FP1 as HD Series mounting accessories.
What warranty does the HD-MA35U carry?
This product is covered by a 7-year RDL warranty. For warranty claims, RMAs or support, contact Creation Networks at (888) 230-3661 or sales@creationnetworks.net.
Can Creation Networks help integrate the HD-MA35U?
Yes. Creation Networks supports system design, equipment selection and installation planning for RDL products nationwide. Call (888) 230-3661 for a quote or technical help.
At Creation Networks, we do everything we can to create an excellent customer experience. This includes fast shipping and easy returns.
- Most in-stock orders placed Monday-Friday ship within 24-48 hours. General restrictions apply; please see our full shipping policy here.
- We offer a 30-day return policy from the delivery date on many products. Product restrictions apply. Restocking fees for the return of open-box items. Please see our full return policy here for more information.
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