Yes, a Harman Kardon 630 Bluetooth connection needs no soldering. The 630 is the archive's first Twin Powered Harman Kardon: each channel gets its own power supply, effectively a mono amplifier per side, rated 30 W per channel into 8 ohms, both channels driven. Introduced in 1973 and built for Harman Kardon by Roland, it brings the green-dial look into the collection.
Figures on this page were checked September 2026. Every table row carries its source.
Spec snapshot
| Item | Value | Notes | Source |
|---|---|---|---|
| Production run | 1973–1976 | Introduced 1973; retail $359.95; replaced by the 730 for 1976 | CR |
| Power output | 30 W/ch @ 8 Ω | RMS, both channels driven, 20 Hz-20 kHz, 0.5% THD; power bandwidth 10 Hz-40 kHz; period coverage adds a competitors'-methods comparison around 45 W/ch | CR, HE |
| Design signature | Twin Powered | A separate power supply for each channel, effectively a mono amplifier per side | CR |
| Manufacturing | Built by Roland | Produced for Harman Kardon; the later 430/730 were Shin Shirasuna builds | CR |
| Lineup position | Middle | Above the 25 W 430, below the 35 W 730; the 930 topped the range at 45 W | CR |
Source codes: CR classicreceivers.com · HE HiFi Engine (via Wayback snapshot). Data as of September 2026. This is the first Harman Kardon profile in the archive; its specification rows rest on period coverage with a manual-page cross-check, and the input-sensitivity table for this model is not part of the documented record yet.
Where to connect
AUX input
RecommendedThe always-active high-level spare, the standard home for an external source on receivers of this class. A line-level Bluetooth receiver with RCA output connects here; this page keeps the connection guidance qualitative because the 630's documented input-sensitivity table is not part of the record yet.
Tape monitor loop
Good alternativeThe tape loop through the monitor switch serves the same role documented across every receiver in this archive: feed the play jacks, select tape to listen, and switch the monitor back off for the other sources.
Phono input
Not for line-levelThe phono stage expects a cartridge. A line-level Bluetooth receiver would overload it, and the turntable would lose its input.
Set up in three steps
- Pick AUX
Keep the tape loop free for a recorder; AUX is the natural Bluetooth home.
- Connect and power
Bluetooth receiver RCA out to AUX, USB power attached, pair once with your phone.
- Level check
Volume low, select AUX, then raise. Fixed/line output on the adapter if it offers the option.
Quirks and notes
- Twin Powered is dual mono (verified): the tag line sits under the model name on the faceplate, and the design it names is a separate power supply for each channel, effectively a mono amplifier per side. It is the series' engineering identity and the green dial face completes the look.
- Outsourced build (verified): period coverage records Roland as the manufacturer of record for the 630, with the series' later additions moving to Shin Shirasuna, so the same brand spanned factories within a few years.
- New brand, growing record (verified): this profile opens the Harman Kardon shelf in the archive; its connection rows are qualitative by design until a documented input-sensitivity table surfaces, with the factory owner's manual hosted on the manufacturer's support site as the known candidate source.
What you need
- Bluetooth receiver with RCA output, LDAC or aptX HD preferred
- 0.5–1 m RCA cable
- USB power for the receiver
FAQ
Use the AUX input for a Bluetooth receiver with RCA output and select AUX; if AUX is occupied, a tape loop through the monitor switch is the documented alternative. No internal modification is needed.
The Twin Powered tag refers to a separate power supply for each channel, essentially like having a mono amplifier per side, the design signature Harman Kardon built the series around. It is an output-stage architecture, not a connection feature, so Bluetooth planning is unaffected.
Rated 30 W per channel into 8 ohms, both channels driven, from 20 Hz to 20 kHz at no more than 0.5% distortion, with a power bandwidth of 10 Hz to 40 kHz. Period coverage adds that competitors' measurement methods would have rated it around 45 W per channel. It sat between the 25 W 430 and the 35 W 730 in the lineup.
Period coverage records that the 630 was produced for Harman Kardon by Roland and introduced in 1973, with the later 430 and 730 built by Shin Shirasuna from 1976, so the series mixes manufacturing origins.
blafili B3 Bluetooth Music Receiver
RCA + XLR + optical out, LDAC and aptX HD, OLED status display. Matches the 630 line-level inputs without adapters.
- Introduced 1973, produced for Harman Kardon by Roland, 30 W/ch, retail $359.95, Twin Powered designation ("separate power supplies for each channel"), power bandwidth 10-40 kHz, green dial face, lineup context (the 930 at 45 W/ch and $479.95 as the top of the line; 430 and 730 added in 1976 built by Shin Shirasuna; the 730 rated 35 W/ch per the same source), competitors'-methods comparison (around 45 W/ch): classicreceivers.com/harman-kardon-630, accessed 2026-09-25
- Power specification cross-check (30 W per channel into 8 ohms at 0.5% THD): HiFi Engine, Harman Kardon 630 manual page, verified via Wayback snapshot, accessed 2026-09-25
- Harman Kardon 630 owner's manual hosting location (support.harmanaudio.com) noted as the candidate source for a future input-sensitivity table; contents not retrieved at check time