Teac CD-P 4500 specifications

Category : CD-Player

Brand : Teac

General

Tech nical data

Manufacturer: Teac
Model: CD-P 4500
Type: CD Player
Years of manufacture: 1993 - 1994
Made in: Japan
Color: Black
Remote control: yes
Energy consumption: 14 W
Dimensions (WxHxD): 435 x 119 x 284 mm
Weight: 5.8 kg
Factory price approx.: 698 DM, 1993

Drive: a32356331cf2a7f56e45306fc6d328d9S-210A
Frequency response: 20 Hz - 20 kHz + -1.0 dB
Harmonic distortion factor: 0.002% or less
Dynamic range: 98 dB or more
Noise voltage range: 105 dB
Channel separation: 104 dB or more

Other models of the same series:
Integrated amplifier:
Teac A-X 1000
Teac A-X 3000
Teac A-X 5000

Tuner:
Teac T-X 3000

Teac AG-620

Teac AG-V 1020
Teac AG-V 3020

CD -Player:
Teac CD-P 3500
Teac CD-P 4500
Teac PD-555
Teac VRDS-7
b3ce84b988e69660523cb294d0c05868
Teac VRDS-20

CD Changer:
Teac PD- D 850
Teac PD-D 880

Tape Deck:
Teac V-370
Teac V-510
Teac V-1010
Teac V-2020 S
Teac V-30 10
Teac V- 5010
240947767dc9997e1c51f62ee27052fa 010
Teac V-80 00 S
Teac W-410
Teac W-700 R
Teac W-800 R
Teac W-6000 R

Equalizer:
Teac EQA-110
Teac EQA-22 0

Picture: Teac CD-P 4500

The D/A converter of the CD-P4500 is a 1-bit DAC "SAA7350GP" (commonly known as the new bitstream DAC) from Philips .
SAA7350 is famous for "DAC7" in combination with TDA1547, but it is also an excellent DAC by itself and is also used in Pioneer PD-T07, etc.
SAA7350GP is a PDM (Pulse Density Modulation) 1-bit DAC. There are 4 DACs inside and 2 DACs are used for one channel for differential output. The digital data input supports up to 20 bits.
With 1-bit DAC, requantization noise occurs when converting 16-bit data from CD to 1-bit. A circuit called noise shaper (noise shaping) moves it to a frequency that is higher than the audible band.
The effect of the noise shaper changes depending on the combination of sequence and oversampling frequency. By simply increasing the order, the noise in the audible band is reduced, but the so-called high-frequency noise is increased, and you need to increase the order of the low-pass filter behind the DAC, that is, make it stronger.
Higher-order low-pass filters increase the number of parts, which leads to a deterioration in sound quality and a phase shift at high frequencies.
Therefore, the SAA7350GP uses a 16.9MHz clock, the noise shaper is used for 3rd order single-stage noise shaping, and the oversampling frequency is increased by 384 times to reduce the noise in the audible band.
By the way, if it is used as "DAC7" in combination with TDA1547, then 1-bit data passed through this noise shaper will be sent to TDA1547 for D / A conversion.
The digital filter is manufactured by NPC and uses 20bit /8x oversampling.
Servos and signal processing circuits are made of SONY chips. Since the pickup and the mechanism are also from Sony , half of the main parts of the CD-P4500 are made by SONY.
In function, the pitch control function is executed and the pitch of ± 12% can be adjusted.
When you enter the length of the cassette, the time editing function will automatically program the songs that are entered on the A and B side according to the length.
Other functions are a random memory program, a music jump, a cue lock, a 4-mode repeat performance, a 3-mode time counter, an automatic memory space, an index search, a music search, a timer playback and a display ON / OFF function.
The chassis is made of sheet steel. The bottom plate is a single 1 mm thick steel plate, but the top plate is doubled with a 2 mm thick steel plate.
There are two supports on both sides of the mechanism to increase the strength of the chassis. Such a structure was adopted in entry-level models in the nineties, but now only some models of intermediate and higher are being adopted.
The interior is the "Center Mecha", which is popular nowadays. By optimizing the weight compensation and arranging the digital circuit and the audio circuit (analog) via the mechanism, it is possible to reduce the interference from the digital circuit to the audio circuit. Especially with the CD-P4500, the beam also acts as a shielding plate.
The layout is an audio circuit on the left side. The center is the mechanism and the power transformer. The right side is the control panel, servo circuit, signal processing and power supply circuit.
A noise filter is installed in front of the power transformer to reduce the penetration of noise from household power supplies.
The power transformer has a separate winding and is an independent power supply, which is divided into a digital circuit, a mechanical circuit and an audio circuit. The audio capacitor is "SME " from Nippon Chemi-Con.
It seems to be a normal level for an entry-level model, but it seems that the anti-noise measures in the power supply for digital circuits are weak, the noise returns to the transformer, and from there it enters the winding for audio, as a result of which the sound is produced the audio circuit worse. It seems to be.
When I connected an EMI filter (ferrite) to the power supply line extending from the transformer part to the audio power supply part, the sound became a little clearer.
The power cord is a thin parallel cable.
Servos and signal processing circuits are made of SONY chips. The servo control is "CXA1372S" (analog servo), the RF amplifier is "CXA1081S". The signal processing circuit for EFM demodulation and error correction and pitch control is "CXD2500AQ".
In addition, TIs "SN74LS628N"is used for the VCO (voltage-controlled oscillator) for the PLL circuit used during signal processing.
The effect of the noise shaper changes depending on the combination of sequence and oversampling frequency. By simply increasing the order, the noise in the audible band is reduced, but the so-called high-frequency noise is increased, and you need to increase the order of the low-pass filter behind the DAC, that is, make it stronger.
The digital filter uses the 20-bit 8-fold oversampling "SM5840AP" of the NPC.
According to the catalog, the back of the DAC is a DC balanced transmission amplifier, but it is a simple circuit with few parts for a balanced circuit.
The receiving and driving mechanism are mounting parts from SONY and a model called "a32356331cf2a7f56e45306fc6d328d9L-210AFM". It is used in many CD players such as YAMAHA CDX-640, AIWA EXCELIA XC-003 and NEC CD-720.
There are two output terminals, fixed and variable analog. Digital is a lighting system.
In addition, there is a terminal for synchronizing a CD player and a cassette deck.