Yes, a TOA A-912MK2 Bluetooth connection goes through a line-level plug-in module. All eight inputs are module slots, so the receiver's output lands on whatever line-input module the rack carries, and the speaker side serves 25 V or 70 V lines plus 4 and 8 ohm systems behind one impedance switch.
Figures on this page were checked October 2026. Every table row carries its source.
Spec snapshot
| Item | Value | Notes | Source |
|---|---|---|---|
| Rated output | 120 W | Series siblings at 30 W and 60 W share the chassis design | OM/Spec |
| Inputs | 8 module slots | Edge-connector bays for optional plug-in modules, each with a front volume control | OM |
| Speaker outputs | 25 V, 70 V, 4 Ω, 8 Ω | Screw terminals; DIRECT position selects unbalanced low impedance only | OM |
| Output, transformer side | Main (T) balanced | 8 Ω, 25 V and 70 V balanced per the specification sheet | Spec |
| AUX OUT jack | 10 kΩ, 1 V | Rear program output for feeders; line-input modules carry the receiver side | Spec |
| Muting | Two-level, module-based | MUTE 1 and MUTE 2 rear terminals; muting function arrives with optional modules | OM/Spec |
| Tone | Bass and treble | Front TONE DEFEAT switch plus LOW CUT for speech work | OM |
| Expanding | AUX OUT, PRE AMP IN/OUT, BRG IN/OUT | Booster feeds, external processing and amplifier combining on the rear panel | OM |
| Rack mounting | MB-25B bracket | EIA rack mount with the optional bracket, four side screws each side | OM |
Source code: OM = 900 Series II Operating Instructions; Spec = A-912MK2 UL specification sheet (both accessed 2026-10-08).
Where to connect
A line-input module, already in the rack
RecommendedMost installed A-912MK2 units carry a line or tuner module among their eight, because the building needed one for a background source. The receiver's output lands on that module's input, the module's front-panel knob becomes the music volume, and the mixer treats it like any of its eight channels.
Add the module if the slots are empty
Good alternativeThe manual's module-installation section covers fitting plug-in modules behind the front panel. A line-level module gives the receiver a clean home, and a muting module adds the two-level page duck the specification sheet describes.
Speaker-line side of the house
Not for sourcesThe 25 V/70 V terminals belong to the amplifier's output stage, and the manual is blunt about it: high voltage is applied to the speaker output terminals and the instruction is not to touch them. Sources enter through the modules, nothing else.
Set up in three steps
- Check the impedance switch
DIRECT serves low-impedance speakers only; any other position routes the transformer-balanced 25 V and 70 V lines. The switch is set before power, per the speaker-connections section.
- Seat the receiver at the module
XLR or RCA per the module, level trim on the module's own input, and the front INPUT knob for the mix position.
- Walk the line
Low cut in for speech intelligibility, tone defeat as a bypass reference, then the master up against the room. The peak indicator watches the sum.
Quirks and notes
- Every input is a module (verified): there is no chassis-level aux input on the A-912MK2; the eight edge-connector bays are the whole input farm, and manuals describe the module selection as application-dependent.
- The high-voltage warning is the manual's own (verified): the safety precautions state that high voltage is applied to the speaker output terminals and warn against touching them, which is the same 70.7 V physics this site's 70V walkthrough does the math on.
- Two-level muting is a module feature (spec): the specification sheet credits optional modules with the two-level muting function; the MUTE 1 and MUTE 2 terminals are the wiring points.
- Combining without re-cabling (verified): BRG IN/OUT and the pre-amp loop let two units share a program feed, which is how a second zone picks up the same wireless source.
- No Bluetooth anywhere in the manual (verified): neither the operating instructions nor the specification sheet mentions wireless audio; the receiver is the Bluetooth.
What you need
- Bluetooth receiver with a balanced output preferred for module line inputs
- A line-input module among the eight slots (most installed units have one)
- Speaker wiring per the impedance switch position, 25 V/70 V or 4-8 Ω
- MB-25B bracket only if the unit is going into a rack
FAQ
Through a line-input module in one of the eight slots. The amplifier takes no unbalanced music source at the chassis itself; its inputs are edge-connector module bays, so the receiver feeds the line module already installed, or the installer adds one, and the module output counts as one of the eight mixed inputs with its own volume knob.
No. The operating instructions and the specification sheet describe module-based inputs and no wireless function of any kind. Bluetooth arrives with the receiver, and it reaches the mixer the same wired way any tuner or CD player would.
The speaker terminals match 25 V or 70 V constant-voltage lines plus 4 and 8 ohm low-impedance systems. The impedance switch in the DIRECT position enables only the unbalanced low-impedance connection; any other position enables the transformer-balanced 25 V and 70 V lines per the manual.
The specification sheet lists a two-level muting function available with optional modules, and the rear panel carries MUTE 1 and MUTE 2 terminals for external mute control. With a muting module in place, a page signal ducks the music inputs without touching the master volume.
blafili XLR Bluetooth Audio Receiver
A balanced XLR output with aptX HD, USB powered with a 16-hour battery, matched to the balanced line inputs on TOA 900-series modules.
- TOA 900 Series II Operating Instructions (A-903MK2/A-906MK2/A-912MK2, 16 pages): general description ("8 input slots that permit the use of various optional plug-in modules"), speaker output terminals designed to match 25 V or 70 V line or 4 Ω or 8 Ω speaker systems, the DIRECT-position impedance switch behavior, front-panel INPUT 1-8 with bass/treble/tone-defeat/low-cut, rear-panel MUTE 1/MUTE 2/BRG IN-OUT/AUX OUT/PRE AMP IN/OUT/REMOTE VOL, the high-voltage speaker terminal warning, and MB-25B rack mounting. toa-products.com/international/file.php?sid=418, accessed 2026-10-08
- TOA A-912MK2 UL specification sheet (2 pages): "8-CHANNEL MIXER POWER AMPLIFIER (120 WATT)", up to 120 watts output, optional plug-in modules with two-level muting function, Main (T) 8 Ω/25 V/70 V balanced, Main (D) 4 Ω unbalanced, Aux 10 kΩ/1 V. toa-products.com/international/file.php?sid=4753, accessed 2026-10-08