The speaker system plays a crucial role in the overall sound quality of audio equipment. A typical speaker consists of several components, including the horn, crossover (not found in full-range cabinets), cabinet, wiring, and sound-absorbing materials. Due to its relatively simple structure, the speaker system has a low failure rate and limited types of common issues. However, there are four main fault categories that users often encounter.
**No Sound**
1. **Disconnected speaker or faulty crossover**: If the speaker cable is broken, the speaker unit will not receive any excitation voltage, leading to a complete loss of sound. While crossovers rarely fail, issues such as desoldered joints or short-circuited capacitors can occur.
2. **Broken voice coil**: To check for this, use a multimeter set to R×1. If the resistance reads ∞, scrape off the lacquer from both ends of the voice coil with a small knife and measure again. If it still doesn't conduct, the voice coil is internally broken. If the resistance is normal but you hear a "click" sound, the lead wire may be damaged, and you can re-solder it or replace it with a similar enameled wire.
3. **Broken speaker leads**: Frequent vibrations can cause the braided wire inside the speaker to break. Sometimes the cotton core remains intact while the braided wire is damaged. These wires are hard to find, so you can replace them with slightly longer flexible cables.
4. **Burnt voice coil**: If the resistance is close to 0Ω and no "click" sound is heard, the voice coil is likely burnt. Before replacing it, remove any debris from the magnetic gap. Carefully insert the new voice coil into the gap, adjust its position, and secure it with super glue while listening for sound. Once properly positioned, fill half the gap with glue and reattach the dust cover. After 24 hours, the speaker should be fully functional.
**Sometimes No Sound**
1. **Poor contact in speaker leads**: The voice coil leads may become moldy or poorly soldered. When the paper cone vibrates, the connection can intermittently break, causing sporadic silence.
2. **Broken or shorted voice coil leads**: This can also result in intermittent or no sound output.
3. **Faulty power amplifier output jack or disconnected speaker line**: A loose connection at the input or output can prevent sound from being transmitted.
**Low Volume**
1. **Degraded speaker performance**: If the magnet’s strength decreases, it can reduce the speaker’s sensitivity. You can test the magnet by touching it with a ferromagnetic object. If the attraction is weak, consider replacing the horn.
2. **Loose magnetic core**: A loose magnetic core can cause the voice coil to shift, affecting sound quality. Gently pressing the cone during maintenance may reveal if the core is misaligned. If so, disassemble and re-adhere the components.
3. **Faulty crossover**: Issues like a shorted capacitor or inductor in the crossover can block certain frequency bands, resulting in uneven volume. Check all crossover components carefully.
**Abnormal Sound**
1. **Debris in the magnetic gap**: Foreign objects can cause the voice coil to rub against them, leading to distorted or hoarse sound.
2. **Voice coil rubbing the core**: If the voice coil is misaligned, it may touch the core, causing distortion. Adjusting or replacing the voice coil can resolve this issue.
3. **Damaged cone**: A torn or broken cone can significantly affect sound quality. If the damage is extensive, replace the cone with a similar material. For smaller tears, use a thin piece of paper or other durable material to patch it.
4. **Poor cabinet construction**: A poorly sealed cabinet or improperly installed mesh cover can cause cracking or resonance, leading to abnormal sounds. Ensure the cabinet is sturdy and well-constructed to avoid these problems.
165V High Power DC System
Variable voltage DC Power Supply support master-slave configuration to increase the output capacity to 576kW. SYS series cabinets use world famous circuit breaker to control the input of each power module inside. After power on, the specified 3U or 6U height power supply will be configured as a Master to control all of the slave units. CSP is the Master in SYSA series cabinets, which is equipped with a PDU (Power Distribution Unit) and a CSP (Control & Supervisory Panel).
Connecting the cabinet
1. The cabinets can be connected in parallel in order to increase output power.
â— Maximum 16 units 3U height same model DC power supplies or 6U height same model DC power supplies can be connected via the bus.
â— 16 units each with a power of 18kW are connected together to a 288kW system.
â— 16 units each with a power of 36kW are connected together to a 576kW system.
2. Different height cabinets can be connected in parallel.
â— Use parallel bars to simplify the connection between multiple rack cabinets.
â— Realized the gapless connection between multiple rack cabinets.
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APM Technologies Ltd , https://www.apmpowersupply.com
