Downside? It costs $300+, while you can find a used BT100 for $40 and patch it for free.

The Cambridge Audio BT100 was once the "magic key" for Audiolab and Cambridge owners, a proprietary dongle that granted Bluetooth powers to high-end DACs and amplifiers. But in the fast-moving world of digital audio, the BT100 has become a relic—expensive, limited to aptX (not HD), and increasingly hard to find.

The closest you will get without opening a screwdriver.

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