Feedback is taboo for the American Ayre. Consistently she cleans the data with recently filter in the new CX 7e CD player MP (3800 EUR).
- CD player Ayre CX 7e MP
- stereoplay – expertise: digital filter
- Data sheet
Charles Hansen, Chef and pioneer of American Ayre, is one of the most creative developers in the international audio scene. The enemy of sound feedback (“Come on the funnel”, stereoplay 5/09 on page 126) he avoids not only in its amplifiers, but iron also in CD players like the 3800 euro expensive CX 7e MP.
“MP” stands for “Minimum period”, a digital filter programmed by Hansen, which he sees as a better alternative to conventional screenings.
In the early years of the CD (and with most players still today) the filter should satisfy two uncompromising conditions: it had to be linear frequency and not to the music signal is extremely steep slope side pattern from counting data. As a side effect, it heralded pulses with a long time ago and after ringing. This energy of ringings, argued Hansen, is missing the music signal. In addition, transients are sanded.
Hansen is not alone with the conception of a short filter. As one of the first, Wadia with similar data relating to the dogma of the CD Creator put across. In an altered form years shortened variants as additional option to the traditional filters offered later under other Marantz and T + A in their players.
Filter is not the same filter – the differences are in detail, i.e., computing rules programmed into the processor building blocks. The best result from numerous listening tests found Charles Hansen in an impulse response with zero before transducers and an extremely short decay time. He takes the mathematical regularity, that short filters allow only a smooth transition into the block area and consequently in the listening area, a slow decrease in altitude is (less than 3 decibels at 20 kilohertz), in purchase.
A loophole is the developer still left open: A switch offers an alternative to “listen” with “measure” on straight frequency response. A hint that the audiophile clientele to immediately understand.
A coincidence? The hearing testers by stereoplay also always preferred the “short” version with a little ringing in the past.
If the filter is not long since the only difference to the in stereoplay 2/08 tested CX 7e. Hansen was the complete player on the head. As a drive, a DVD-ROM drive from TEAC now reads the data from the disc. Speed, allowing very low turn out noises from the drive. So the still puny selection signals can travel the path between the drive and the logic board without prejudice to, the manufacturer donated a shielded cable armed better against electromagnetic interference.
Also microprocessor responsible for the filter calculations has become even faster. He makes less miscalculation, because he now with a happy increases the CD clock 1,4112 MHz – what exactly the transmission bandwidths of SACD. The D/A converter (PCM 1738) waits with an appropriate decoder interface and offers also balanced outputs, which also uses the Ayre.
Consistently CX 7e drives the analog signal MP balanced to XLR outputs, of which each a PIN builds a bridge to the RCA jacks. The German distributor offers a filter upgrade for owners of the CX 7e Sun audio for 380 euros. Worth digital retreading?
The Ayre opened new dimensions in the listening test. He sounded crystal clear, Free of slag and flawlessly. The price comparable player Marantz SA 11 S 2 (test 3/08, 62 CD points) Paroli could offer with any of his four filters. Always, he was compared to the Ayre acting with more height magic, point more precise figure and facet-rich dynamics less feisty and Impregnated.
The point in terms of higher-based old CX 7e (2/08) glittered with pronounced fine height, could but the “analog” shimmer, the imaginable space figure and the authority of his family growth does not keep up with. The CX 7e MP brought even the five times as expensive player reference Naim audio CD 555 in distress his dynamic usage with its fun. With more inner strength and bass volume, the Naim maintained less than his Reference thermometer.
Digital filter can simulate analog filters. Depending on the programming, they perform arbitrarily complicated functions. You can roughly be divided on two families.
Traditional filters of FIR (finite impulse response) calculate the output signal from multiple cached values of the input signal. There is not a return of the output. Your advantage: Constant group delay, meaning that signals in the passband are not distorted, but only delayed. They are less sensitive to quantization errors and jitter.
The history of IIR filters (infinite impulse response) as in the Ayre calculated from input and output values. Badly calculated IIR filters tend to vibrate. A linear phase progression can be only approximate. Decisive advantage over FIR filters: the unnatural pre ringing is eliminated.
Ayre CX 7e MP
Technical data and test results
|Dimensions (W x H x D)||43.5 x 12.0 x 33.0 cm|
|Remote control / Adaptive||/ No|
|Outputs unbalanced / symm.||/|
|Digital output TosLink / ST / coaxial / XLR||nabaasa|
|Display CD / SACD text||No|
|capable of reading CD-R / CD-RW||/|
|Headphone output / adjustable||nabaasa|
|Random track selection|
|Error correction information layer CD||3.00 mm|
|Error correction surface CD||3.00 mm|
|Power consumption standby / operating||11.2 / 11.7 W|
|Sound||Absolute top class|
(maximum 70 points)
(maximum 10 points)
(max. 15 points)
(maximum 10 points)
|Overall rating (max. 120 points)||very good-89 points|
|Price / performance||outstanding|
|tested in issue:||6 / 09|