T+A CD1230R Referentieklasse CD speler, handmade in Germany

The sparkling little brother to the CD 1240 R has everything that its sibling offers apart
from the two-way converter, the co-ax output and the dual-transformer mains section. This
gives us the chance to mention a few of this family’s exemplary qualities:
As with our other CD players this unit employs a freely programmable signal processor
(DSP). DSPs are not limited in the way they can process digital signals, and for this reason
such a system ensures better oversampling than would be possible with standard
conventional chips. Until now oversampling filters were designed to provide as smooth a
frequency response as possible, but their timing characteristics (pre- and post-echo) have
been neglected. The problem is long pre- and post-echo effects which can seriously distort
the musical signal, especially with transients. A different type of filter is now available which
exhibits perfect transient handling: these are known as polynomial filters, and unfortunately
they are characterised by a slight treble fall-off at 20 kHz. In the CD 1230 R we employ a
particular class of these filters which has been developed by T+A: BEZIER polynomial
types. These are combined with an IIR filter in a three-stage oversampling process. The
result is a filter which produces no pre-echos. The human ear is particularly sensitive to preechos for two reasons: on the one hand such an echo can never occur in the natural world,
and on the other they are not concealed by the main signal, unlike post-echos. This new
filter also boasts a frequency response which is considerably smoother than that of other
polynomial filters (e.g. cubic spline types). Such sophisticated filters cannot be purchased
ready-made, and that is why a digital signal processor is employed in the CD 1230 R. The
freely programmable signal processor of the CD 1230 R is not tied to a single filter, and this
makes it possible for the unit to provide five different filter types offering subtly different
sound characteristics - from the classical long FIR filter via short FIR filters to the BEZIER
filter. These filters can be selected by means of a button on the front panel of the unit.
Two Sigma-Delta stereo converters operating in double differential mode for
optimum performance in terms of noise, overload and dynamics
T + A reverse clock process provides 192 kHz / 24-bit resolution and eliminates jitter,
driving the performance of the system close to the physical limits.
Connection elements
Analog Out The analogue output of the CD player supplies a fixed-level
output signal. It is designed for connection to a pre-amplifier,
integrated amplifier or receiver with its own volume control
Digital Out Optical digital output for connection to an external
digital/analogue converter.
Optional co-axial digital output.
RC IN RC input socket for connection to an "R"-series pre-amplifier,
integrated amplifier or receiver.
CD 1230 R


R-Link Interface for future system expansions
Standard-filter (long FIR-filter)
The long FIR-filter is the standard oversampling filter used in digital technology.
Advantages: Extremely linear frequency response in the audible range, very high stop band
attenuation, linear phase, constant group delay.
Filter 1 (short FIR-filter
The short FIR-filter has similar characteristics to the long FIR filter, but very much lower
coefficient (160) and consequently considerably lower pre- and post-echoes. Advantages:
Extremely linear frequency response in the audible range, high stop band attenuation, linear
phase, constant group delay.
Filter 2 (IIR-filter)
This filter is a classic 8th order IIR-filter. It exhibits absolutely no pre-echo effects, albeit a
slight tendency to post-echo. This is also a feature of natural instruments, and in any case
the post-echo is usually masked by the normal audible signal. Advantages: No pre-echo at
all, no treble loss, very high stop band attenuation.
Filter 3 (Bezier- / IIR-filter)
This combination circuit consists of three cascaded filters: a Bezier filter, an IIR filter and a
second Bezier filter. It represents a good compromise between transient response and
frequency response. Advantages: Virtually no pre-echo, minimal post-echo (in masking
range), relatively flat frequency response, no pronounced treble loss.
Filter 4 (Bezier-filter)
The Bezier-filter is the ideal filter in terms of transient response, virtually no pre- or postecho, linear phase, slight treble roll-off at 20 kHz. Advantages: Optimum transient response,
linear phase, constant group delay.
Specifications
Mechanism Professional, close-tolerance linear disc
mechanism with triple-beam LDGU optics, 780
mm semi-conductor laser, 2 mW power
Wow and flutter Quartz-controlled, not measurable
Mechanical construction Rigid all-metal case, shielded sub-assemblies,
vibration de-coupled
Digital filters Freely programmable signal processor with four
different filter types, 8-times oversampling and
56-bit resolution, FIR short, FIR lang, IIR
Bezier, Bezier IIR filters
D/A converter type Double differential mode. Two 1-bit Sigma-Delta
converters with 256-times oversampling
Analogue filter Phase-linear Bessel filter
3rd order with 60 kHz limit frequency
Frequency response 2 Hz – 20 kHz
Distortion / intermodulation < 0,002 %
T+A - Produktarchiv CD 1230 R
Effective system dynamics 97 dB
Signal: noise ratio (A-weighted) 109 dB
Signal: noise ratio (unweighted) 106 dB
Channel separation 1 kHz / 10 kHz 106 / 100 dB
Digital output Data format SP-DIF
1 x Opto = 660 nm / -18 dBm
Analogue output nominal 2,6 V eff, 22 Ohm
Dimensions 7,5 x 44 x 39 cm
Weight 7 kg
Colour alu silber
Remote control Via R system or as non-standard version

Zeer fijne en evenwichtig klinkende CD speler, handgemaakt in Herford Duitsland

Enorme brede en diepe soundstage met heel veel detail en holografisch beeld. Eerder warm dan uberanalytisch, urenlang luisteren zonder vermoeiend te worden.

Elegant en tijdloos ontwerp.

Nieuwprijs circa €1750,- nu voor 599,- te koop in prima staat.

Afstandsbediening tegen meerprijs

Eventueel te koop met bijpassende 1220R tuner versterker, eveneens van hoogstaande klasse.

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