Yes, a Marantz 2245 Bluetooth connection needs no soldering. Best path: a Bluetooth receiver with RCA output into the AUX input (180 mV into 100 kOhm, per the factory specifications). If AUX is taken, use the Tape loop. Rated 45 W per channel into both 4 and 8 ohms, it carries the Gyro Touch tuning and the classic Marantz blue dial.
Figures on this page were checked September 2026. Every table row carries its source.
Key figures for the 2245
| Item | Value | Notes | Source |
|---|---|---|---|
| Production run | 1971–1976 | Retailed around $450 in 1971; approx. 2,298 DM in German lists | CR, HW |
| Power output | 45 W/ch @ 4 and 8 Ω | Same rating into both impedances, both channels driven, 20 Hz-20 kHz; 135 W IHF music power at 8 ohms | SM |
| Phono input | 1.8 mV / 47 kΩ | MM stage, the Marantz house convention documented across this archive | SM |
| Line inputs | Tape In · AUX | High level 180 mV / 100 kOhm; Tape Out 775 mV for a recorder | SM, HW |
| Pre / Main | Pre out · Main in | Jumpers on the rear panel, plus a Quadradial output jack | SM, HW |
| Speakers | 2 pairs | Power bandwidth 7-70,000 Hz; damping factor greater than 45 | HW, SM |
| Weight | ≈ 17 kg | 310 W max / 34 W idle consumption; WC-22 wood cabinet option | HW |
Source codes: SM Marantz 2245 Specifications (archive.org manualzilla-id-7426228) · HW hifi-wiki.com · CR classicreceivers.com. Data as of September 2026.
Plugging into the 2245
AUX input
Recommended180 mV into 100 kOhm is the factory figure for AUX here, shared with the bigger 2270. A line-level Bluetooth receiver with RCA output feeds it directly.
Tape monitor loop
Good alternativeThe Tape In/Tape Out pair offers a 775 mV record output, a strong feed for a deck. Borrow it by feeding the play jacks, pressing Tape Monitor to listen, and releasing it for the other sources.
Phono input
Not for line-levelThe MM phono stage is built around a cartridge's 1.8 mV, a figure that recurs across this archive's Marantz pages. Line-level Bluetooth output would overload the stage, and the turntable would lose its input.
2245 setup in three moves
- Give AUX the job
Leave the tape loop to a recorder if one is attached; AUX handles the Bluetooth feed.
- Plug in and pair
Bluetooth receiver's RCA output into AUX, hook up its USB power, and pair with your phone a single time.
- Raise it slowly
Volume low, pick AUX, and come up gradually. Fixed/line output on the adapter, if it offers that setting, is the one to pick.
What to watch on the 2245
- One rating, two impedances (verified): the factory specifications rate 45 W per channel into 4 ohms and 8 ohms alike, both channels driven across the full band, which is unusually even-handed for 1971. Speakers of either impedance get the same honest wattage.
- The quad jack is an output (verified): the rear panel's Quadradial jack feeds a four-channel decoder or recorder; unlike the Sansui 881's four-channel inputs, nothing here takes a quad source in.
- Gyro Touch and the Mid knob (verified): period coverage highlights the flywheel Gyro Touch tuning and the Mid tone control, a band most receivers of this class split into bass and treble only.
Shopping list for the 2245
- Bluetooth receiver with RCA outputs, LDAC or aptX HD preferred
- A 0.5–1 m RCA cable
- Power for the receiver over USB
FAQ
Plug a Bluetooth receiver with RCA output into the AUX input and select AUX. If AUX is occupied, use the Tape In loop and press the Tape Monitor button. No internal modification is needed.
The factory specifications rate 45 watts per channel into 4 and 8 ohms, both channels operating simultaneously from 20 Hz to 20 kHz, with 25 W into 16 ohms and 135 W of comparable IHF music power into 8 ohms.
Per the factory specifications: the high-level AUX input takes 180 mV into 100 kOhm, and the phono stage takes 1.8 mV into 47 kOhm. Tape Out is documented at 775 mV for a recorder.
Yes, the rear panel carries Main In and Pre Out connections, normally linked by jumper plugs, alongside a Quadradial output jack. Leave the jumpers in place for a standard Bluetooth setup.
blafili B3 Bluetooth Music Receiver
RCA + XLR + optical out, LDAC and aptX HD, OLED status display. Matches the 2245 line-level inputs without adapters.
- Rated power (45 W per channel into 4 and 8 ohms, both channels operating simultaneously, 20 Hz-20,000 Hz; 25 W at 16 ohms; 135 W comparable IHF music power at 8 ohms), high-level input 180 mV / 100,000 ohms, phono 1.8 mV / 47 kOhm, damping factor greater than 45: Marantz 2245 Specifications (archive.org, identifier manualzilla-id-7426228), accessed 2026-09-25
- Production years 1971-1976, weight approx. 17 kg, approx. 2,298 DM, WC-22 cabinet, Tape Out 775 mV, Quadradial output, Pre Out and Main In, 2 speaker pairs, power bandwidth 7-70,000 Hz: hifi-wiki.com/index.php/Marantz_2245, accessed 2026-09-25
- Produced 1971 to around 1976 at 45 W/ch into 8 ohms, retail around $450 in 1971, Gyro Touch Tuning, Mid tone control: classicreceivers.com/marantz-2245, accessed 2026-09-25