T + A CD 1230R CD Player Transport w/ DAC

Unit has sat in a smoke free home for 10 years. Maybe used 10+ times.
Comes with power cord but no remote. Remote was not included but was optional originally.
Original MSRP - $3,675
CD-Player - PULSAR CD 1230 R

Original unit splash text:

The sparkling new CD 1230R player has everything! 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:

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.

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 pre- echos 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.

Connection elements

Analog Out

Digital Out

RC IN

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

Optical digital output for connection to an external digital/analogue converter.

Optional co-axial digital output.

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 post- echo, linear phase, slight treble roll-off at 20 kHz. Advantages: Optimum transient response, linear phase, constant group delay.


Specifications

Wow and flutter Mechanical construction

Digital filters

D/A converter type Analogue filter

Frequency response Distortion / intermodulation

Mechanism

Professional, close-tolerance linear disc mechanism with triple-beam LDGU optics, 780 mm semi-conductor laser, 2 mW power

Quartz-controlled, not measurable

Rigid all-metal case, shielded sub-assemblies, vibration de-coupled

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

Double differential mode. Two 1-bit Sigma-Delta converters with 256-times oversampling

Phase-linear Bessel filter

3rd order with 60 kHz limit frequency

2Hz–20kHz < 0,002 %

T+A - Produktarchiv CD 1230 R

Effective system dynamics Signal: noise ratio (A-weighted) Signal: noise ratio (unweighted) Channel separation 1 kHz / 10 kHz Digital output

Analogue output Dimensions Weight Colours

97 dB

109 dB

106 dB

106/100dB

Data format SP-DIF

1 x Opto = 660 nm / -18 dBm

nominal 2,6 V eff, 22 Ohm

7,5x44x39cm

7kg

Color: alu silber, silver