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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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 | Mini Mono Channel Class D Sub Amp, Full-Frequency and Bass Switchable Home Theater Audio Amplifier for Passive Speakers

Product ID: 145214571

Details

Manufacturer
Nobsound
Maximum supply voltage
35 Volts
Minimum supply voltage
24 Volts (DC)
Mounting type
Freestanding
Voltage
24 Volts (DC)

⚡300W max power output

📏Compact mini aluminum chassis

🔄Dual PBTL/SUB mode switch

₩290950

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Sold byAmazon South KoreaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🎵 Elevate your sound game with the Nobsound G2 PRO — where power meets precision.

PRO GRADE PROTECTION - Built-in speaker protection and low-pass filter ensure distortion-free audio even at max volume.
VERSATILE AUDIO MODES - Seamlessly switch between full-frequency and dedicated subwoofer output for tailored soundscapes.
POWERHOUSE PERFORMANCE - Unleash 300W of crystal-clear, room-filling sound that commands attention.
PRECISION BASS CONTROL - Fine-tune your low-end with adjustable SUB frequency from 40-300Hz for immersive home theater vibes.
SLEEK DURABLE DESIGN - Compact, solid aluminum build that fits stylishly on any desk or shelf without sacrificing power.

The Nobsound G2 PRO is a compact, 300W Class D mono amplifier designed for both passive speakers and active subwoofers. Featuring a dual-mode PBTL/SUB switch, adjustable bass frequency, and a robust 32V/5A power supply, it delivers high-fidelity sound with built-in protection circuits. Its sleek aluminum chassis combines durability with modern aesthetics, making it an ideal upgrade for home theater and desktop audio setups.

Specifications

ASIN	B07TTMN51V
Best Sellers Rank	25,225 in Electronics & Photo ( See Top 100 in Electronics & Photo ) 101 in Hi-Fi Amplifiers
Brand	Nobsound
Country Of Origin	China
Customer Reviews	4.2 4.2 out of 5 stars (216)
Included Components	1* 32V/5A Power Supply, 1* G2 PRO Mono Power Amplifier
Item Weight	0.5 Kilograms
Manufacturer	Nobsound
Manufacturer Part Number	DZ072_UK
Material	Metal
Maximum Output Power	300 watts
Maximum Supply Voltage	35 Volts
Minimum Supply Voltage	24 Volts (DC)
Model Number	DZ072_UK
Mounting Type	Freestanding
Number of Channels	1
Number of Items	1
Output Power	300 Watts
Package Type Name	Cardboard Box
Product Warranty	1 YEAR
Specification Met	CE
Supply Current	5 Amps
Unit Count	1.0 count
Voltage	24 Volts (DC)

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₩290950

Duties & taxes included

In stock

Sold byAmazon South KoreaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to South Korea.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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Fantastic experience overall. Will recommend to friends and family.

1 month ago

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Customer service was outstanding when I had questions about the product.

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