Yes, a Yamaha EMX512SC Bluetooth connection needs no soldering. Best path: a Bluetooth receiver with RCA output into the LINE jacks of stereo channel pair 9/10 or 11/12. Those jacks are unbalanced line inputs rated for a nominal +5 dBu signal. Keep the PHANTOM switch off and use the RCA or phone line inputs, not the XLR mic jacks, for a line-level feed.
Figures on this page were checked October 2026. Every table row carries its source.
Spec snapshot
| Item | Value | Notes | Source |
|---|---|---|---|
| Channels | 4 mono + 4 stereo pairs | Mono 1 to 4 mic/line; stereo pairs 5/6 to 11/12 | OM |
| Stereo line inputs | Phone + RCA | Phone on 5/6 and 7/8, RCA pin on 9/10 and 11/12, unbalanced | OM |
| Line input spec | 10 kΩ, +5 dBu nominal | Max before clip +25 dBu on stereo line jacks | OM |
| Mono ch INPUT A | TRS balanced line | Accepts balanced and unbalanced, LINE/MIC switch | OM |
| Mono ch INPUT B | XLR mic/line | Mic max before clip -15 dBu; line max +15 dBu via the LINE/MIC switch | OM |
| Phantom power | +15 V | All mic inputs, one switch, condenser mics only | OM |
| Max output power | 500 W/ch @ 4 Ω | 350 W @ 8 Ω, both channels driven, 1 kHz, THD+N 0.5% | OM |
| Speaker outputs | Phone + Speakon | Neutrik NL4 plugs only, POWER AMP switch for main/monitor | OM |
| Effects and EQ | 16 programs, 7-band | Compressors on channels 1 to 4 | OM |
| Weight / size | 8 kg | 442.5 × 284 × 264 mm (W × H × D) | OM |
Source code: OM = Yamaha EMX512SC/EMX312SC/EMX212S Owner's Manual (English edition, accessed 2026-10-02).
Where to connect
Stereo channel RCA jacks (9/10, 11/12)
RecommendedUnbalanced line inputs rated 10 kΩ with a nominal +5 dBu level and clipping only past +25 dBu. A receiver with RCA output plugs straight in, and the left and right jacks carry their signals to the main left and right buses independently.
Phone line jacks or channel 1 to 4 INPUT A
Good alternativeStereo pairs 5/6 and 7/8 take unbalanced 1/4 inch phone plugs. INPUT A on the mono channels is a balanced TRS line input that also accepts unbalanced plugs; set its LINE/MIC switch to LINE with the mixer powered down first, as the manual instructs.
XLR mic jacks (INPUT B and stereo MIC)
Not recommendedINPUT B takes mic or line level depending on the LINE/MIC switch, and at the MIC setting it clips at just -15 dBu, which a line-level Bluetooth feed blows straight past. The stereo RCA and phone jacks need no switch decision at all. And if phantom is on, Yamaha warns non-mic devices connected to the XLR jacks may be damaged.
Set up in three steps
- Pick the input
RCA jacks on pair 9/10 or 11/12 when free. Otherwise a phone pair or INPUT A with the switch set to LINE.
- Connect and power up in order
The manual asks for sources first, the EMX next, and powered speakers or amps last. Power down in reverse.
- Level check
Start the master low, play audio from the phone, then bring up the channel pair and master together. Watch the main meters and back off if they run hot.
Quirks and notes
- Phantom is +15 V, not 48 V (verified): fine for condenser mics, but leave the switch off unless one is connected. The manual asks you to toggle it only with the mixer and other powered devices switched off.
- Speakon only with NL4 plugs (verified): the SPEAKERS jacks take phone or Speakon connectors, and Yamaha specifies Neutrik NL4 plugs for the Speakon side.
- POWER AMP switch (verified): sets the speaker jacks to main signal on both outputs, or main plus monitor, which matters if a stage wedge shares the amp.
- Compressors on channels 1 to 4 (verified): the COMP knob tames peaks on wired mics; a Bluetooth feed into a stereo channel passes it untouched.
What you need
- Bluetooth receiver with RCA output, LDAC or aptX HD preferred
- RCA cable of a meter or two, or a 1/4 inch TRS cable for the phone inputs
- Speaker cable for the SPEAKERS jacks, Speakon NL4 or 1/4 inch phone
- USB power for the receiver, a phone charger is fine
FAQ
Plug a Bluetooth receiver with RCA output into the LINE RCA jacks of stereo channel pair 9/10 or 11/12, then raise that pair and the master. The signal joins the main mix and reaches speakers connected to the SPEAKERS jacks. No internal modification is needed.
The stereo channel LINE jacks expect line level: 1/4 inch phone jacks on pairs 5/6 and 7/8, RCA pin jacks on pairs 9/10 and 11/12. Channel 1 to 4 INPUT A also works as a balanced or unbalanced TRS line input with the LINE/MIC switch set to LINE. INPUT B accepts mic or line level through the same switch; at the MIC setting it clips at -15 dBu.
No. The owner's manual describes no wireless input of any kind. Bluetooth arrives with the receiver you plug into a line input, not from the mixer itself.
The PHANTOM switch sends +15 V to the mic inputs, and Yamaha warns that devices other than condenser microphones may be damaged when it is on. Leave PHANTOM off for a Bluetooth setup. It applies to mic inputs only, not the RCA or phone line inputs.
blafili B3 Bluetooth Music Receiver
RCA + XLR + optical out, LDAC and aptX HD, OLED status display. Plugs into the EMX512SC stereo line inputs without adapters.
- Input channels (4 mono mic/line + 4 stereo pairs), INPUT A/B jacks, stereo LINE jacks (phone on 5/6-7/8, RCA pin on 9/10-11/12), phantom +15 V caution, input characteristics (10 kΩ line inputs, nominal +5 dBu, max before clip +25 dBu) and maximum output power (500 W @ 4 Ω, both channels driven, 1 kHz, THD+N 0.5%): Yamaha EMX512SC/EMX312SC/EMX212S Owner's Manual, data.yamaha.com/files/download/other_assets/7/335497/emx512sc_en_om_f0.pdf, accessed 2026-10-02
- Manual channel: usa.yamaha.com support/manuals library, EMX512SC entry, accessed 2026-10-02