The Ultimate Command Center for Your Studio.

The Aeromix 3+5LS is Fitness Audio’s flagship multi-input mixer — engineered to manage the complex audio demands of modern fitness facilities.

With five music inputs and three microphone channels, the 3+5LS handles multiple instructors, virtual classes, background music, and instructor devices simultaneously — all from a single centralized control system.

Its most powerful feature is the built-in USB streaming output, allowing you to send your full voice-and-music mix directly to a computer for seamless virtual classes on platforms like Zoom. No external interfaces. No extra hardware. Just plug and stream.

Advanced managerial controls allow facility operators to lock maximum volume levels and regulate background music independently — creating a true “set and forget” audio environment that protects equipment, hearing safety, and brand experience.

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Product FAQ

Setup & Installation

01 Is the Aeromix 3+5LS rack-mountable, and what rack space does it require?

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01 Is the Aeromix 3+5LS rack-mountable, and what rack space does it require?

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01 Is the Aeromix 3+5LS rack-mountable, and what rack space does it require?

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Yes. The Aeromix 3+5LS is a standard 1U rack-mount unit, fitting any 19-inch equipment rack. It occupies exactly one rack unit of vertical space. Standard rack ear mounting holes are built into both ends of the front panel faceplate — no special adapters required.

It can also be placed on a flat shelf or AV furniture surface without rack mounting if preferred.

02 What power supply does it use, and is it included in the box?

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02 What power supply does it use, and is it included in the box?

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02 What power supply does it use, and is it included in the box?

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The 3+5LS runs on 24V DC via an external power supply unit (PSU) that is included in the box. The 24V supply was specifically chosen to deliver the quietest noise floor of any fitness mixer on the market — the higher DC voltage significantly reduces audio hum and interference common in gym environments.

The DC barrel input is located on the far left of the rear panel, labeled 24V DC IN.

03 What cables and accessories are included in the box?

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03 What cables and accessories are included in the box?

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03 What cables and accessories are included in the box?

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Box includes: (1) iJax cable — Fitness Audio's proprietary 6.35mm to 3.5mm stereo cable for connecting phones and tablets to the front-panel iJax input. (2) 6.35mm Jack-to-XLR output cables for connecting the mixer outputs to a power amplifier. (1) 24V DC power supply unit. (1) printed user manual.

Cables for connecting wireless mic receivers, additional RCA music sources, and amplifiers are not included and must be sourced separately.

04 Does it support EVAC (emergency evacuation) fire alarm integration?

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04 Does it support EVAC (emergency evacuation) fire alarm integration?

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04 Does it support EVAC (emergency evacuation) fire alarm integration?

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Yes. The 3+5LS includes an EVAC Link input, required by code in many commercial building installations. When triggered by a fire alarm system, the EVAC link automatically mutes all music while keeping microphone channels live — ensuring instructor voice commands remain audible during evacuation. Connection is via the green screw-terminal block labeled CONTROL on the rear panel.

EVAC integration requirements vary by jurisdiction. Consult your building contractor or AV installer to confirm local fire code compliance before installation.

Inputs & Outputs

05 How many microphone inputs does it have, and what connector types do they accept?

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05 How many microphone inputs does it have, and what connector types do they accept?

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05 How many microphone inputs does it have, and what connector types do they accept?

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There are 3 microphone inputs total. Two are combo XLR/6.35mm jack inputs on the rear panel (MIC 1 INPUT and MIC 2 INPUT) — accepting both balanced XLR from a wireless mic receiver and a 6.35mm jack (balanced or unbalanced). Balanced XLR is recommended for wireless receivers as it is less susceptible to noise and interference.

The third is a 3.5mm jack on the front panel labeled Alt. Mic 2 — ideal for visiting instructors who can plug in directly from the front without touching the rear panel. Each rear XLR input has an individual TRIM control. The mixer also supplies +15V phantom power.

06 How many music inputs are there, and how do I connect a phone or tablet?

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06 How many music inputs are there, and how do I connect a phone or tablet?

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06 How many music inputs are there, and how do I connect a phone or tablet?

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There are 5 stereo music inputs: one front-panel iJax 6.35mm jack input (connect phones via the included iJax 3.5mm adapter cable), three standard RCA stereo pairs on the rear for media players and virtual class systems, and one dedicated BGM (Background Music) RCA stereo input on the rear panel.

The BGM input is controlled by a rear-panel screw trimmer only — the front-panel Music Vol. knob has no effect on it. This prevents unauthorised volume changes to background music or between-class playlists.

07 What output connections does the mixer provide?

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07 What output connections does the mixer provide?

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07 What output connections does the mixer provide?

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L/R Stereo Outputs — two 6.35mm TRS jacks at 1V nominal, for connecting to a power amplifier or installed sound system.

Subwoofer / Mono Output — 6.35mm TRS with a built-in selectable crossover (50Hz, 100Hz, 120Hz, or Bypass) and a Mono mode switch.

MOM (Music Only Monitor) Output — sends music signal only, with microphone excluded. Useful for secondary zones or clean music-only recording.

USB Type-B Digital Output — sends the full mixed signal to a computer for live streaming. See the Streaming & USB section for full details.

08 Can I use the subwoofer output with my existing sub amplifier?

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08 Can I use the subwoofer output with my existing sub amplifier?

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08 Can I use the subwoofer output with my existing sub amplifier?

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Yes. The Subwoofer/Mono output has a built-in crossover with four selectable settings: 50Hz 100Hz 120Hz and SUB (Bypass). Select the crossover point that matches your subwoofer's specifications and room acoustics. Connect using a standard 6.35mm TS or TRS cable from the SUB output to your sub amplifier's input.

09 What is the MOM output and when would I use it?

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09 What is the MOM output and when would I use it?

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09 What is the MOM output and when would I use it?

"faq-aeromix__question" onclick="faqAeromixToggle(this)" aria-expanded="false"> 09 What is the MOM output and when would I use it?

MOM stands for Music Only Monitor. This output carries the music signal only — all microphone channels are excluded. Common uses: feeding background music to a reception area, hallway, or warm-up zone where you want music but not instructor voice; sending a clean music-only feed to a recording device; or driving a secondary amplifier zone with music only.

Streaming & USB

10 How does the USB streaming output work and what do I need to use it?

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10 How does the USB streaming output work and what do I need to use it?

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10 How does the USB streaming output work and what do I need to use it?

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The 3+5LS has a built-in A/D (analog-to-digital) converter board connected to a USB Type-B DIGITAL OUT port on the rear panel. It converts your complete mixed signal — voice over music — to digital audio and sends it directly to a Mac or PC via a standard USB-B cable.

Your computer recognises the mixer as a standard USB audio device. No drivers are required on Mac, and most Windows systems are plug-and-play. In Zoom, Teams, or any streaming platform, select the Aeromix 3+5LS as your audio input source.

No external audio interface is required. This replaces a separate USB audio interface entirely.

11 Which streaming and video conferencing platforms does it work with?

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11 Which streaming and video conferencing platforms does it work with?

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11 Which streaming and video conferencing platforms does it work with?

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Because the USB output presents as a standard USB audio device, it is compatible with any software that allows audio input selection — including Zoom, Microsoft Teams, Google Meet, OBS Studio, StreamYard, YouTube Live, Facebook Live, Webex, and GoToMeeting, among others. In each platform, navigate to audio/microphone settings and select the Aeromix 3+5LS or "USB Audio Device" as your input source.

12 Does the USB output send the full voice and music mix, or just the microphone?

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12 Does the USB output send the full voice and music mix, or just the microphone?

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12 Does the USB output send the full voice and music mix, or just the microphone?

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The USB output sends the complete post-mix signal — instructor microphone blended with music, exactly as it sounds in the room. Virtual participants hear the same balanced voice-over-music mix as in-room attendees, with no additional configuration required.

13 Can I run a live in-room class and a Zoom virtual class at the same time?

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13 Can I run a live in-room class and a Zoom virtual class at the same time?

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13 Can I run a live in-room class and a Zoom virtual class at the same time?

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Yes — this is one of the primary use cases the 3+5LS was designed for. The L/R outputs feed your room's amplifier and speakers simultaneously while the USB output feeds your computer. Both outputs operate independently at the same time, with no extra switching or hardware required.

Volume Control

14 What is the rear-panel Master Volume Lock and how does it work?

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14 What is the rear-panel Master Volume Lock and how does it work?

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14 What is the rear-panel Master Volume Lock and how does it work?

"faq-aeromix__question" onclick="faqAeromixToggle(this)" aria-expanded="false"> 14 What is the rear-panel Master Volume Lock and how does it work?

The Master Volume Control is a recessed potentiometer on the rear panel that sets the absolute maximum output level the system can ever reach. Once set during installation, the front-panel volume knob only operates within that ceiling — no instructor, member, or substitute can exceed it. The recessed design requires a small flathead screwdriver to adjust, discouraging unauthorised changes.

Essential for facilities managing sound compliance regulations, protecting amplifier and speaker equipment, or reducing hearing damage liability.

15 How does the BGM (Background Music) volume lock work?

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15 How does the BGM (Background Music) volume lock work?

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15 How does the BGM (Background Music) volume lock work?

"faq-aeromix__question" onclick="faqAeromixToggle(this)" aria-expanded="false"> 15 How does the BGM (Background Music) volume lock work?

The dedicated BGM input has its own independent rear-panel MIN and MAX screw trimmers. The front-panel Music Vol. knob has no effect on this input. This lets facility managers set a fixed, locked level for between-class background music or BGM playlists — members and instructors at the front panel cannot adjust it at all.

16 Can two instructors use microphones at the same time?

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16 Can two instructors use microphones at the same time?

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16 Can two instructors use microphones at the same time?

"faq-aeromix__question" onclick="faqAeromixToggle(this)" aria-expanded="false"> 16 Can two instructors use microphones at the same time?

Yes. The 3+5LS has three independent mic inputs, each with its own volume knob. Two instructors can be live simultaneously — connect each wireless mic receiver to the two rear combo XLR inputs (MIC 1 and MIC 2) and control each level independently with Vol. 1 and Vol. 2. Pairing with two Fitness Audio DX6 Digital Wireless receivers allows both instructors to operate on separate digital channels simultaneously without interference.

Sound Limiting

17 What is the Audio Slap limiter and how does it protect the class environment?

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17 What is the Audio Slap limiter and how does it protect the class environment?

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17 What is the Audio Slap limiter and how does it protect the class environment?

"faq-aeromix__question" onclick="faqAeromixToggle(this)" aria-expanded="false"> 17 What is the Audio Slap limiter and how does it protect the class environment?

The Audio Slap is Fitness Audio's integrated sound limiting circuit. When audio exceeds a pre-set threshold, it automatically cuts music by –15 dB — a sharp, noticeable reduction that signals to the instructor the level is too high, without killing the system entirely.

The front-panel LIMIT ON red LED illuminates when limiting is active. The LIMITING yellow LED flashes at the moment of limiting. Threshold is adjusted via the rear LIMIT THRESHOLD screw trimmer. The circuit can be toggled off via the rear LIMITER OFF / SLAP switch.

18 How do I calibrate the limiter threshold for my room?

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18 How do I calibrate the limiter threshold for my room?

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18 How do I calibrate the limiter threshold for my room?

"faq-aeromix__question" onclick="faqAeromixToggle(this)" aria-expanded="false"> 18 How do I calibrate the limiter threshold for my room?

With the system running at the loudest acceptable volume for your space, adjust the rear LIMIT THRESHOLD screw trimmer until the front-panel LIMIT ON LED just begins to flicker. That point becomes the ceiling. Any signal exceeding it triggers the –15dB cut. Facilities with specific sound compliance targets should calibrate alongside a dB measurement tool or SoundEar monitoring device for precision.

19 Does the limiter affect the microphone channels or only the music?

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19 Does the limiter affect the microphone channels or only the music?

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19 Does the limiter affect the microphone channels or only the music?

"faq-aeromix__question" onclick="faqAeromixToggle(this)" aria-expanded="false"> 19 Does the limiter affect the microphone channels or only the music?

The Audio Slap limiter acts on the music signal only. When triggered, music is reduced by –15dB while all microphone channels remain at full level. The instructor can continue to speak clearly to the class during a limiting event — the sudden music drop also serves as an immediate audible prompt to bring volume down.

Compatibility

20 Which Fitness Audio wireless microphone systems are compatible?

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20 Which Fitness Audio wireless microphone systems are compatible?

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20 Which Fitness Audio wireless microphone systems are compatible?

"faq-aeromix__question" onclick="faqAeromixToggle(this)" aria-expanded="false"> 20 Which Fitness Audio wireless microphone systems are compatible?

The 3+5LS is compatible with all Fitness Audio wireless systems that output via XLR or 6.35mm jack — including the DX6 Digital Wireless series (recommended; balanced XLR output into rear combo inputs), the MTU8 Analog series, and the SM716 receiver. Connect the receiver's XLR mic output directly to MIC 1 INPUT or MIC 2 INPUT using a standard XLR cable. Third-party wireless systems with standard XLR or balanced 6.35mm outputs are also fully compatible.

21 Can I connect a Bluetooth music source directly to the mixer?

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21 Can I connect a Bluetooth music source directly to the mixer?

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21 Can I connect a Bluetooth music source directly to the mixer?

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The 3+5LS does not have built-in Bluetooth. However, a separate Bluetooth music receiver (such as the Fitness Audio Bluetooth receiver accessory) can be connected to any rear RCA stereo input pair. The Bluetooth receiver pairs with your phone or tablet wirelessly and outputs to the mixer via RCA cables — giving you wireless music playback without Bluetooth being built into the mixer.

22 What type of facility is the 3+5LS designed for?

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22 What type of facility is the 3+5LS designed for?

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22 What type of facility is the 3+5LS designed for?

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The 3+5LS is the flagship of Fitness Audio's mixer range — designed for large fitness clubs, boutique studio chains, multi-instructor training facilities, cycling and HIIT rooms, and hybrid virtual class studios that need to manage multiple instructors, multiple music sources, and sound compliance simultaneously. For a single small studio with one instructor and one music source, a simpler Aeromix model would be more appropriate.

Specs & Tech

23 What are the full technical specifications?

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23 What are the full technical specifications?

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23 What are the full technical specifications?

"faq-aeromix__question" onclick="faqAeromixToggle(this)" aria-expanded="false"> 23 What are the full technical specifications?

Mic Inputs: 3 total — 2× rear combo XLR/6.35mm balanced, 1× front 3.5mm. Phantom: +15V. Individual TRIM per rear input.

Music Inputs: 5 total — 1× front 6.35mm iJax, 3× rear RCA stereo pairs, 1× rear RCA BGM (rear-level-controlled only).

Outputs: L/R 6.35mm TRS stereo (1V nominal), Subwoofer/Mono 6.35mm TRS with crossover (50/100/120Hz + Bypass), MOM output, USB Type-B digital output.

Limiter: Audio Slap —15dB music cut, adjustable threshold, front LED indicators, toggle on/off.

Controls: Recessed rear Master Volume, rear BGM MIN/MAX trimmers, rear Peak Level Reduction trimmer, front Mic Vol. 1 & 2, Mic Treble & Bass, Music Vol., Music Treble & Bass, music source selector.

Power: 24V DC external PSU (included). Form factor: 1U, 19-inch rack-mount. Chassis: Matte black anodized aluminum. EVAC: Rear screw-terminal fire alarm link.

24 What warranty does the Aeromix 3+5LS carry?

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24 What warranty does the Aeromix 3+5LS carry?

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24 What warranty does the Aeromix 3+5LS carry?

"faq-aeromix__question" onclick="faqAeromixToggle(this)" aria-expanded="false"> 24 What warranty does the Aeromix 3+5LS carry?

The Aeromix 3+5LS is backed by Fitness Audio's 2-year manufacturer's warranty against defects in materials and workmanship. Knobs and potentiometers are constructed from heavy-duty, rust-resistant materials built for the high-humidity, high-perspiration environment of fitness studios. For warranty claims or support, contact Fitness Audio via fitaud.com (USA) or fitnessaudioshop.com.au (Australia).

Aeromix 3+5LS — Product FAQ

Setup & Installation

Inputs & Outputs

Streaming & USB

Volume Control

Sound Limiting

Compatibility

Specs & Tech