Like the Arcam, pilot tone at 19kHz barely existed, measuring –90dB. Switched to Flat the 640T gave a smooth response with slightly rolled off upper treble, our analysis shows. It also raises treble level to add some brightness. Lively lifts bass less, by +3dB again but below 250Hz. Warm lifts bass only, by around +3dB below 450Hz – quite a lot. Cambridge have fitted switchable frequency response equalisation to the rear panel, marked "warm" and "lively" in addition to normal (flat). The Cambridge Audio Azur 640T is very similar to Arcam’s DT-91, using a Radioscape DAB/VHF module, but there are differences. Still, the Cambridge did have discernible midrange smear on both DAB and FM compared to the other tuners, but this did not detract from an otherwise brilliant performance.Īn excellent all rounder and an absolute pleasure to use and listen to, this tuner is very well built, finished, priced and designed - few hi-fi components tick all four of these boxes! In absolute terms it can’t quite match the Creek, NAD or the reference on FM, but remains absolutely outstanding value for money. Radio Three FM also had an excellent showing violins were really tangible while horns were well rounded and dynamically resolved, convincingly, naturally, rendered. With Radio Two FM, the sound gained in spatiality in comparison to the Cambridge’s own DAB version. I couldn’t discern any DAB compression or sibilance to the vocals either. On Radio Three DAB 192kbps, orchestration was lush and unrestrained - where the Cambridge handled the crashing crescendos without strain. On Radio Two DAB 128kbps, it featured a vibrant sound that I thought was not possible on DAB, let alone the lower bitrate of 128Kbps! It proved thoroughly enjoyable, with the vocals in music being beautifully presented. The Cambridge produced one of the best results for the group on both FM and DAB. Vital statistics are 70x430x305mm and 3.9kg. At the rear panel, there is an F-Type aerial socket for DAB/FM, gold-plated electrical digital out, optical digital out, input loop through phono sockets to save an input socket on an amplifier, output phono sockets, switchable ‘Natural Contour Technology. A frame transformer feeds a linear power supply. The DAB module uses a Texas Instruments fixed point DRE200 chip while the DAC is a Wolfson WM8716 24/192Khz type with 48kHz sample rate. Inside the Cambridge also features a Radioscape DSP similar to the Arcam, which takes both the FM (with direct digital synthesis and digital demodulation) and DAB through the digital DSP. The top plate is nicely screwed into the main chassis with flush mounted countersunk star head fixings. The side panels are attractive extruded aluminium C-sections, each smoothly folded six times.
To its right are countersunk buttons for DAB/FM, Autotune, Info, Select and Left and Right Arrow symbols for tuning.
The poorly legible LC display is a disappointment. The first of the three hybrid DAB/FM designs, the Cambridge sports the best silver coating of the group, with finely countersunk openings for the centrally located display and buttons either side.