Can you plug samsung phone into this to boost the output.

You could do and it would work. My Nobsound has two separate input jacks (rca) therefore if you are intending to use this to power two speakers. then you would be advised to get a 3.5mm phono jack to two RCA plugs. I used my Nobsound to power a small 8" subwoofer through a filter (to get rid of everything above 250 hze.

My amplifier only has a 3.5 lineout for an active subwoofer. Can this unit be used with my passive subwoofer? Any recommendations?

The low frequency version should work for you by amplifying your passive subwoofer from your stereo amplifier pass-through. I have two of the full-frequency versions which I use in different rooms for powering mono centre channel speakers as tv 'sound bars'. One set up works very well but the other suffers from hum that I have not yet eradicated,. My experience chimes with reviews that suggest that these small amps can work well but are sensitive to ground-loop and interference issues in their set-up.

Can I use this to power a 70 watt with 8 ohms speaker?

I think not. It should be like 50W @8 ohms

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Nobsound 100W Subwoofer Amplifier, Mono Channel Digital Power Amplifier Audio Mini Amp

Product ID: 61793344

Details

Manufacturer
Nobsound
Maximum supply voltage
24 Volts
Minimum supply voltage
12 Volts
Mounting type
Surface Mount
Voltage
24 Volts

⚡100W max power output

🔗3.5mm AUX universal input

🛡️Advanced circuit protection

Description

🔊 Elevate your bass game with power and style — don’t miss out on the sound revolution!

COMPACT STYLISH DESIGN - Sleek aluminum alloy case fits perfectly in any modern workspace or home setup.
SAFE RELIABLE OPERATION - Built-in circuit protection guarantees spark-free, shock-free performance you can trust.
ULTRA LOW DISTORTION SOUND - NE5532 op amp ensures smooth, balanced audio for a premium HiFi experience.
SEAMLESS DEVICE COMPATIBILITY - 3.5mm AUX input connects effortlessly to phones, TVs, and more for instant audio upgrade.
POWERFUL CLASS D AMPLIFICATION - 100W output drives your subwoofer with crystal-clear, distortion-free bass.

The Nobsound 100W Subwoofer Amplifier is a compact, mono channel digital power amp featuring Class D TPA3116 technology for high-efficiency, low-distortion audio output. With versatile 3.5mm AUX input compatibility and advanced circuit protection, it delivers powerful, clean bass in a sleek aluminum alloy case. Perfect for professionals seeking a premium HiFi subwoofer upgrade with reliable, safe operation.

Specifications

ASIN	B075R3D9VH
Best Sellers Rank	29,586 in Electronics & Photo ( See Top 100 in Electronics & Photo ) 142 in Hi-Fi Amplifiers
Brand	Nobsound
Country Of Origin	China
Customer Reviews	4.2 4.2 out of 5 stars (68)
Item Weight	300 Grams
Manufacturer	Nobsound
Manufacturer Part Number	GFJ445&GFJ518
Material	Aluminum
Maximum Supply Voltage	24 Volts
Minimum Supply Voltage	12 Volts
Model Number	GFJ445&GFJ518
Mounting Type	Surface Mount
Number of Channels	1
Output Power	100 Watts
Product Warranty	1 Year Manufacturer
Specification Met	Technical Specifications
Voltage	24 Volts

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