All amplifiers are designed with solid components. <br> The amplifier has at least 100～15,000HZ frequency response requirements; the deviation at rated output is +1/-2DB (equalization control reaches "flat"). <br> The frequency response of the power amplifier is lower than 70HZ, attenuation with a slope of 6DB per octave. <br> The total harmonic distortion of the uncompressed amplifier can not exceed 0.5% at 1000HZ full output; it can not exceed 1% at 50% output. <br> At rated input, the output level error of the limiter circuit is less than or equal to 3DB, and harmonic distortion of less than or equal to 0.5% is generated when fully restricted. <br> The output of the amplifier meets the requirements of UIC 568 "Railway Passenger Car Audio Equipment" for frequency characteristics and distortion. <br> The power amplifier can not be damaged when the input or output is subjected to a short circuit or an open circuit. <br> The output power of the amplifier can fully meet the input requirements of the speaker. <br> The overall technical parameters of the guest room controller are as follows:<br> Power supply voltage DC110V, fluctuation range 77V~137.5V;<br> Size: 19-inch 3U chassis;<br> Operating temperature range: -21℃~+55℃;<br> Storage temperature range: -40℃～+55℃;<br> Vibration and shock; meet IEC61373;<br> EMC; meet EN50121-3-2;

Support redundant Ethernet ring network and RSTP/STP (IEEE802.1W/D) capability (self-healing time under full load state <50 MS);<br> The 4 interconnection ports have BYPASS function and port aggregation function, which can form a TCN dual-bus vehicle network that conforms to |EC61375-3;<br> Support 8 ports POE power supply, the built-in POE power supply is not less than 100W, the specific requirements are determined in the design contact stage;<br> Support multicast protocols such as IGMP SNOOPING and GMRP;<br> Support IEEE802.1Q VLAN and GVRP protocol;<br> With NAT conversion function and network storm isolation function;<br> Support QOS--IEEE802.1P/1Q and TOS/DIFFSERV, support 802.3AD;<br> Support RIP, RIP2, OSPF protocol;<br> Support SNMP network management protocol;<br> Adopt 1U rack-mount installation method, the depth does not exceed 250mm;<br> The power input meets the vehicle's 110VDC access;<br> Should be fanless design.

Microphone frequency response; 100HZ~15KHZ, ±7DB;<br> Speaker rated output power: about 2W;<br> Speaker audio output: 0DBM~+6DBM;<br> Speaker frequency response: 250HZ~10KHZ, ±7DB;<br> Harmonic distortion: <5%;<br> Signal to noise ratio: ≥50DB(A);<br> Weight: ≤1.5KG;<br> Vibration and shock; meet IEC61373;<br> EMC: Meet EN50121-3-2;

Power supply voltage: 24V DC;,<br> Signal output: 0DBM/6002;<br> Frequency response; 200HZ-10KHZ;<br> Sensitivity: -45DBM <br> Power consumption: <0.5W;<br> Weight: <1KG.

Cone straight radial type;<br> Rated power: 15W;<br> Input method: constant pressure;<br> Input 80HZ～1250HZ, rated power 15W audio signal, the axial free field sound pressure at 1.2M from the floor inside the passenger compartment can be 93DB, which is equivalent to 10DYN/CM2;<br> The frequency response from 70HZ to 20KHZ is better than its response at 1KHZ: ≤-7DB;<br> Frequency response from 100HZ to 10KHZ: ±1DB;<br> At 1000HZ, total harmonic distortion; ≤0.5%, when the output power is 3W;<br> Transformer efficiency: ≥85%, when the output power is 3W;<br> All speakers work in phase;<br> Weight: ≤1.5KG.

Loudspeaker type: conical electric type;<br> Rated power: 15W;<br> Impedance: 8OHM;<br> Input method: constant resistance;<br> Frequency response: 100HZ-15KHZ;<br> Sensitivity: 90DB/1W/1M;<br> Weight: ≤1.2KG.

Microphone type: electric (no noise sound pressure type; <br> Microphone frequency response: ±7DB (200HZ~10KHZ);<br> Microphone output level: -56DB, ±3DB; refer to 1V and BAR;<br> Preamplifier output level: ±3DB(2V);<br> Preamplifier frequency response: +1DB/-2DB(100HZ~12KHZ);<br> Preamplifier harmonic distortion: ≤3% (300HZ~8KHZ);<br> S/N ratio of preamplifier: ≥60DB;<br> Microphone input sensitivity: -45DBM;<br> The preamplifier fully complies with the frequency response and distortion requirements of the UC 568 standard. <br> Bandwidth: 100HZ~16,000HZ;<br> Dynamic range: 65DB;<br> Distortion: <1.3%;<br> Audio output: ODBM is symmetrical, adjustable, not grounded;<br> Power supply: DC110V (77V-137.5V);<br> Power consumption: about 5W;<br> Equipment weight: ≤3KG. <br> Vibration and shock: meet IEC61373;<br> EMC: Meets EN50121-3-2.

Power supply voltage: DC110V, fluctuation range 77V~137.5V;<br> Power consumption: Broadcast channel <300W (tentative); <br> Intercom channel: <30W (tentative); <br> Rated output power: 60W (tentative); <br> Frequency response: 100HZ~10000HZ, ≤±3DB;<br> Distortion rate: <3%; <br> Signal to noise ratio (S/N): ≥60DB;<br> Audio sampling rate: 44.1KHZ/16BIT;<br> Size: 19-inch 3U chassis;<br> Input voltage: DC110V (77V-137.5V); <br> Power consumption: ≤150W;<br> Weight: ≤10KG;<br> Operating temperature range: -21℃~+55℃;<br> Storage temperature range: -40℃~+55℃;<br> Vibration and shock: meet IEC61373;<br> EMC: Meet EN50121-3-2.