Hi-End four-channel car amplifiers:
· selectable "tube" and "transistor" play back modes;
· built-in DSP, 24 bit/96 kHz modules and crossovers;
· audio inputs:
· X1-model in addition to analogue RCA-type jacks contain Toslink optical input/output (PCM / SPDIF-format / No Dolby Digital);
· X3-model in addition to analogue RCA-type jacks, Toslink optical input/output contain BlueTooth digital input (A2DP)*;
· X5-model in addition to analogue RCA-type jacks, Toslink optical input/output and BlueTooth digital input (A2DP) have USB (Audio DAC)**.
* BlueTooth digital input (A2DP) allows to play audio files from mobile phones and tablet computers (PCM 44 kHz, 16 bit);
**Digital USB port (Audio DAC) enables to use amplifier as an external audio-device (e.g.: connecting amplifier to a Windows7 OS computer it will be recognized as an external sound card with all the necessary drivers installed).
· variants of load connection:
· "Bridge" - connects one powerful woofer with two wideband speakers;
· "Bi-Amping" - the use of two channels of amplification to power low-, mid- and high-frequency bands separately, thus connecting two woofers and two tweeters;
· "Standard" - four-channel connection of four wideband speakers.
X1-models discussion on the "pccar.ru"
Reviews about X1-model on the "drive2.ru"
Х-series Technical Specifications:
Amplifier model |
X1 |
X3 |
X5 |
Number of channels |
4 |
4 |
4 |
Class of power amplifier operation |
AB |
AB |
AB |
Output capacity (RMS) |
4 x 80 W |
4 x 80 W |
4 x 80 W |
Selectable modes ("Tube" – "Transistor") |
Yes |
Yes |
Yes |
Speaker connection variants |
Standard / Bi-Amping |
Bridge / Bi-Amping / Standard |
Bridge / Bi-Amping / Standard |
Toslink optical input (SPDIF/PCM format) |
Yes |
Yes |
Yes |
BlueTooth digital input (A2DP) |
–––– |
Yes |
Yes |
USB digital input (Audio DAC) |
–––– |
–––– |
Yes |
Analogue RCA-type jacks |
Yes |
Yes |
Yes |
Built-in DSP |
Yes |
Yes |
Yes |
Direct analogue signal transmission |
Yes |
Yes |
Yes |
Built-in ADC, DAC modules (AD1702 by ADI) |
24 bit, 96 kHz |
24 bit, 96 kHz |
24 bit, 96 kHz |
Crossovers of 2-nd order (by Batterwort) |
Yes |
Yes |
Yes |
High-pass filter* (HPF) |
10 – 150 Hz |
10 – 150 Hz |
10 – 150 Hz |
Low-pass filter* (LPF) |
11 – 20 kHz |
11 – 20 kHz |
11 – 20 kHz |
RCA-analogue input impedance |
10 kOhm |
10 kOhm |
10 kOhm |
Frequency range by power amplifier |
10 – 50 000 Hz |
10 – 50 000 Hz |
10 – 50 000 Hz |
Signal to noise ratio, min |
90 dB |
90 dB |
90 dB |
Total harmonic distortion index (THD), max |
0,02% |
0,02% |
0,02% |
Intermodular distortion index (IMD), max |
0,03% |
0,03% |
0,03% |
Operating supply voltage |
in vehicle network (+12V) |
in vehicle network (+12V) |
in vehicle network (+12V) |
Standby current |
2 А |
2 А |
2 А |
Fuses |
2 x 20 А |
2 x 20 А |
2 x 20 А |
Overheat control |
Yes |
Yes |
Yes |
Output fixed bias protection |
Yes |
Yes |
Yes |
Short circuit protection |
Yes |
Yes |
Yes |
Operational temperature range |
–40 ... +80 оС (up to the protection operation) |
–40 ... +80 оС (up to the protection operation) |
–40 ... +80 оС (up to the protection operation) |
Dimensions |
431 х 248 x 55 mm |
431 х 248 x 55 mm |
431 х 248 x 55 mm |
Weight |
5 kg |
5 kg |
5 kg |
*factory settings can be changed by the user.
Components of the Х-series amplifiers
Power amplifier:
Four-channel Car Amplifier Board (X1)
· selectable "tube" and "transistor" play back modes;
· MOSFET output stages with customized transistors made on our specifications operate in AB-class;
· cascode type of power amplifier with phase-splitter, based on the differential circuit of MOSFET transistors;
· discrete circuitry of each channel;
· double-sided printed boards with 70 μm copper foil;
· twisted pair cabling of power circuit;
· the usage of chip-elements reduces the amount of electromagnetic interference and maintains the temperature balance of the circuit;
· relay-actuated switch of the amplifier output, built in current sensor;
· high-quality LowESR electrolytic and film capacitors;
· short signal paths (for both analogue and digital sound).
DSP board:
DSP Board (ADAU1702)
· all digital signals are processed into the 24 bit/96 kHz format with Cirrus Logic’s CS8422 Digital Audio Receiver;
· analogue signal is processed into the 24 bit/96 kHz format with integrated AD converter ADAU1702;
· digital sound processing with ADAU1702 DSP board by Analog Device. You can change the program in the DSP using the "Sigma Studio” visual programming by connecting your personal computer to the DSP block via the interface block, analogue to USBi (see here);
· analogue signal, the amplifier receives, is formed either by the 24 bit/96 kHz built-in DA converter (integrated AD converter ADAU1702) or passes directly via RCA output through the only feed-through film capacitor and volume delay;
· stabilization of the clock frequency of the DAC and Digital Audio Receiver via high-precision shielded quartz crystal-controlled generator powered from a separate stabilizer;
· the crossover of the 3rd order with passive high-pass filter realized by operational amplifier OPA4134 powered by separate stabilizer.
Power supply board:
Power supply board (X1)
· galvanic isolation of in-/output of the power supply unit, the feedback loop, TL431 reference-voltage source stabilizer;
· separate voltage regulation;
· protected from polarity reversal, short-time input voltage overlapping, the power supply unit overheating and short-circuit at the output;
· minimal interference to a vehicle electrical system;
· input/output filters with the cores made of amorphous metal;
· LowESR electrolytic and film capacitors ensure high peak current and minimal interference.
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