The SB+ is a highly modified Squeezebox Classic (aka SB3). The PSU has been repaced with one that follows the Naim ethos… including great chunky toreoidal transformer and simple well-designed and over-specced components. The design of the audio section particularly has been completely upgraded. The Slimdevices/Logitech ecosystem is run by the free Logitech Media Server (LMS), still the best audio streaming software there is in my opinion (https://lms-community.github.io/lms-server-repository/). Via freely available plugins that can be downloaded via LMS the device supports Spotify, Tidal, Pandora, BBC Sounds, Deezer, YouTube and thousands of radio stations. See https://forums.slimdevices for more info.

The sound is vastly improved ove the SB3. This is the best sounding native Squeezebox device you can run on LMS. It looks cool too and comes with real wood ends, smoked glass front and top quality black metal casing.

Handles formats:
MP3 (CBR and VBR), FLAC, WAV, AIFF, WMA (CBR and VBR), OGG, AAC (.M4A), Apple Lossless, WMA Lossless, APE, MPC, WavPack

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From the designer, Patrick Dixon of @Tunes:

"we completely disconnect the clock, DAC, digital and analogue output circuitry of the base SqueezeBox, and fit our own designed circuit boards, together with state-of-the-art multi-stage voltage regulation. To complete the transformation, we add our own linear PSU with a multi-core interconnect to power the Player.

In addition to the improvements we've made to the clocks, power supplies and analogue outputs, we've also carefully re-designed the S/PDIF digital output driver, using a transformer-coupled balanced output circuit."

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I bought this @Tunes SB+ and a SlimDevices Transporter at the same time. The thin, analytical sound of the Transporter did not suit me but i found the SB+ sound warmer, more immediately attractive and frankly, more analogue sounding.

After two years of running it alongside a Naim NDX streamer (LMS vioa UPnP) I've finally decided to replace it with a Naim NDX. Not because I can tell any difference in the sound (I can't tell them apart) but because the NDX has more facilities.

I’ve not used the SB+ screen (I use a smart phone to control it and leave the screen off) so it is still as new, very bright and flicker free. I also had *all* the capacitors changed just over two years ago (see receipt from Hear Audio in listing). It is in pretty much perfect condition all round (despite how it looks in the photos). It comes with original box, leads and remote (the remote never even left the box).

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There’s a review here:

@-tunes SB+ Audiophile streaming music device review - [English]

http://www.tnt-audio.com/sorgenti/at-tunes_e.html

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Specifications – SB+

Audio Outputs

General

· Digital and analog outputs

· RCA connectors are gold-plated

· Volume control is provided for all outputs

· Multiple outputs may be used at the same time

Analog RCA outputs

· High fidelity Burr-Brown 24-bit DAC

· Two dedicated linear power regulators for DAC and line-out stages

· Full 6.0Vpp line-level signals

· Signal-to-noise ratio: over 100dB

· Total harmonic distortion: less than 0.003%

Digital S/PDIF outputs

· Optical and coax digital connections

· Dedicated high-precision crystal oscillators (no PLL, no resampling)

· Standard IEC-958 (S/PDIF) encoding

· Optical connector: TOSLINK 660nm

· Coax connector: RCA, 500mVpp into 75 ohms

· Sample rates: 44.1Khz, 48Khz

· Audio format: linear PCM, 16 or 24 bits per sample

Headphone output

· Standard 1/8" jack also can be used with an IR blaster

· Minimum headphone impedance: 16 ohms

· Total harmonic distortion: less than 0.03%

· Left/right crosstalk attenuation: 92dB

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Note: If you don't know what this is you're not likely to want it. It depends upon Logitech's wonderful free streaming software Logitech Media Server (LMS)... still pretty much the best streaming platform there is in my humble opinion.
https://lms-community.github.io/lms-server-repository/