Can i use this amp to bypass my knackered active amp ie just usse the shell and connect direct to the speaker?

Yes I bought it to do this myself just had to open the sub and disconnect the plate amp. Used the speaker connections for convenience wired to be a passive sub.

Can I use this amplifier with active subwoofer only? (Without connecting anything to speaker output?)

No it need a full range speaker and then used with an active sub woofer

Can this work with tpa3116 amplifier (ns-15g) and nobsound 6j2 vacuum tube preamplifier? i want to add a subwoofer to my hi fi.

as long as your current amplifier has a sub out channel or any such output that can provide a signal such as a tape out.

Can i connect a 100 w bookshelf speaker and 150w active subwoofer in the full frequency mode ? at the same time ? thx

In full frequency mode the unit is just a straight forward amp and will drive a passive bookshelf as normal. Since you are using an active sub it will tap of the signal going to the bookshelf again as normal.

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🎵 Elevate your sound game — compact power that commands attention!

COMPACT STYLISH - Sleek aluminum chassis fits effortlessly into any modern home or desktop audio environment.
DUAL AMP SETUP READY - Use two units independently for left and right channels, eliminating interference and maximizing stereo clarity.
VERSATILE AUDIO MODES - Seamlessly switch between full-frequency and dedicated subwoofer amplification to suit your setup.
POWERHOUSE PERFORMANCE - Unleash 300W of clean, distortion-free bass and full-range sound with the TPA3255D2 chip.
PRECISION SOUND TUNING - Customize your audio with adjustable gain levels and subwoofer frequency control for perfect bass response.

The G2 PRO 300W Subwoofer Amplifier is a compact, class D mono amplifier designed for both full-frequency and subwoofer use. Featuring a powerful TPA3255D2 chip and a 32V/5A power supply, it delivers up to 300W of clean audio output. Its dual-mode switch, adjustable gain, and sub frequency tuning provide versatile, high-fidelity sound customization. Housed in a durable aluminum chassis, it’s perfect for professional-grade home theater and desktop audio setups.

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Manufacturer	Nobsound
Part number	DZ072_UK
Item Weight	500 g
Package Dimensions	25.5 x 21.6 x 6.6 cm; 500 g
Item model number	DZ072_UK
Material	Metal
Voltage	240 Volts
Item Package Quantity	1
Plug profile	Surface Mount
Batteries included?	No
Batteries Required?	No

Nobsound G2 PRO 300W Subwoofer Amplifier, Mini Mono Channel Class D Integrated Sub Amp, Full-Frequency and Bass Switchable Home Theater Audio Amplifier for Passive Speakers/Active Subwoofer

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