Yes, a Marantz 2270 Bluetooth connection needs no soldering. Best path: a Bluetooth receiver with RCA output into the AUX input (180 mV line level). If AUX is taken, use the Tape Monitor loop. Recommended codec: LDAC or aptX HD for source quality. The phono stage stays untouched.
Spec snapshot
| Item | Value | Notes | Source |
|---|---|---|---|
| Production run | 1971–1975 | Sold from late 1971 | HW, OV, CR |
| Power output | 70 W/ch @ 8 Ω | Both channels driven | HW, OV |
| AUX input | 180 mV / 100 kΩ | Line level, always active | HW |
| Phono inputs | 2 × 1.8 mV / 47 kΩ | MM with RIAA, do not use for line-level | HW |
| Tape loops | 2 × record/play | Tape Monitor playback path | HW |
| Pre / Main | Pre out · Main in | U-jumpers fitted from factory | AK |
| Original price | ≈ $550 | 1971 USD | OV, CR |
Source codes: CR classicreceivers.com · HW hifi-wiki.com · OV olegvintageaudio.com restoration write-up · AK Audiokarma community. Data as of September 2026.
Where to connect
AUX input
RecommendedLine level and always active, so the receiver plays Bluetooth the moment you select AUX. Full quality with no button juggling.
Tape Monitor loop
Good alternativeUse Tape 1 In and press Tape Monitor. Handy when a CD player already owns AUX. Switch the button back afterwards, or the tuner and phono will appear dead.
Phono or speaker-level taps
Not recommendedPhono inputs apply RIAA equalization plus high gain, so a line-level signal distorts badly. Speaker-level taps can damage both the receiver and the Bluetooth unit.
Set up in three steps
- Pick the input
AUX when free, otherwise Tape 1. Note which front-panel button applies.
- Connect and power
Bluetooth receiver RCA out to the chosen input, USB power for the receiver, pair once with your phone.
- Level check
Start the 2270 volume at minimum, select the input, then raise. Set the adapter output to fixed/line if it offers the option.
Quirks and notes
- Protection relay delay (verified): output clicks in within a few seconds after power-on. Power the 2270 on last and off first.
- Dial lamps run warm (commonly reported): leave ventilation space above the cabinet.
- DC offset drift (unverified): community reports vary on factory tolerance for this series; worth measuring before driving sensitive speakers. Unverified
What you need
- Bluetooth receiver with RCA output, LDAC or aptX HD preferred
- 0.5–1 m RCA cable
- USB power for the receiver, a phone charger is fine
FAQ
Plug a Bluetooth receiver with RCA output into the AUX input and select AUX. If AUX is occupied, use the Tape 1 input and press the Tape Monitor button. No internal modification is needed.
AUX is the simpler choice because it is always active. Tape Monitor also carries full line level, but remember to switch the monitor button back, or the main sources will sound silent.
With an LDAC or aptX HD link on both ends, most listeners struggle to reliably pick the wireless feed in controlled comparisons. SBC is where quality loss becomes noticeable on detailed material.
Any receiver with RCA output and LDAC or aptX HD support. The blafili B3 also adds XLR and optical outputs if your rack later grows.
blafili B3 Bluetooth Music Receiver
RCA + XLR + optical out, LDAC and aptX HD, OLED status display. Matches the 2270 line-level inputs without adapters.
- Input sensitivity and configuration: hifi-wiki.com Marantz 2270 spec sheet
- Production run, power rating and restoration practice: olegvintageaudio.com and evilscienceaudio.com Marantz 2270 write-ups
- Retail price: olegvintageaudio.com ($549.95, High Fidelity April 1972) and classicreceivers.com