K4-450 Digital Amplifier can be connected in mono parallel.How to use K4-450 in mono-parallel？
(one input feeds two identical outputs)

Operation as follows:
To identical signal on CH 1 and CH 2
Step 1: Flip the hidden switches to ON
Step 2: Plug your signal into Input 1.


To identical signal on CH 3 and CH 4.
Step 1: Flip the hidden switches to ON
Step 2: Plug your signal into Input 3




Difference between Parallel Mode and Bridge Mode
Parallel Mode
• The two input channels are combined to mono, and both output channels (CH1 & CH2) are driven.
• In Parallel Mode, the audio fed into CH1 is automatically copied to CH2.
• It is rarely used—mainly when you run short of audio cables.

When a pro-sound power amp is switched to Parallel Mode:
• Its output impedance is halved.
• The rated power of one channel doubles, but because the load is shared by CH1 and CH2, each output still delivers the original single-channel wattage.
• Power does not add (e.g., a 100 W×2 amp becomes 100 W×2, not 200 W×1).

Bridge Mode
• Only one audio cable is required; the two channels are merged into a single mono channel.
• Power does add.
• Wiring changes: the loudspeaker is connected across the two “hot” terminals (usually CH1+ and CH2+), with the negative terminals left open.
• Commonly used to drive a single subwoofer.

In Bridge Mode
• The two channels are summed to mono, the output voltage doubles, and the available power rises significantly (e.g., 100 W×2 → 300 W×1).
• The load impedance must be doubled (e.g., 8 Ω minimum per channel → 16 Ω in bridge).

 

Mode	Parallel Mono	Bridge Mono
Core Principle	Both channels operate in-phase and in parallel; the current output is summed	Both channels are driven in anti-phase and bridge-tied load (BTL); the voltage swing is summed.
Output Power Relationship	Delivered power ≈ 2× the single-channel rating (current capability doubles)	Delivered power ≈ 4× the single-channel rating (because the voltage swing doubles)
Impedance-Matching Rule	Permits halving the minimum load impedance (e.g., 8 Ω per channel → 4 Ω in parallel).	Requires the load impedance to be doubled (e.g., 8 Ω per channel → 16 Ω when bridged).
Load Application / Suitability	Ideal for low-impedance, high-current loads (e.g., dual-voice-coil subwoofers or multiple paralleled cabinets).	Suited for high-impedance, high-voltage applications (e.g., a single high-power loudspeaker used in long-distance transmission scenarios).
Signal Input Method	Only one input signal is required (left input; right channel automatically tracks).	Needs a differential (balanced) input signal derived from the same source  (a dedicated bridge-drive circuit is recommended).
Topology Characteristics	Maintains the dual-channel output architecture	Merged into a single drive channel (full-bridge push-pull output topology).
Safety Precautions	Total load current must be monitored to prevent sustained low-impedance overload.	Operating without a load or with an incorrectly high impedance is strictly prohibited; a DC-protection module is strongly advised.

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