Product details

The BT20ABT20A PRO, BT30DBT30D PRO, and TB10D amplifiers are equipped with replaceable orange and grey knobs. Customization of the amplifier's appearance, making it easier for users to tailor their setup to their individual preferences.

To replace the knobs, just need a cloth with friction, simply grasp the existing knob firmly and pull it straight off the shaft. Then, align the new knob onto the shaft and press it firmly in place. Make sure that the new knob is securely attached before use.

FAQs

Please read our FAQs page to find out more.

How to: Choose the right banana plug?
  • Closed Screw Type. All Fosi amplifiers use standard-sized speaker terminals (4mm pins).
  • Easy to wire up and solidly connect to amplifier and passive speaker.
  • If they do not fit, use a little force to tighten the plugs.
  • Fosi Audio Banana Plugs (Copper, Silver/Gold Plated): http://bit.ly/40Djq0U, https://bit.ly/3MkPL8t
  • Please watch tutorial videos: https://youtu.be/6pYhoqDlvNw / https://youtu.be/RGvBgGAwS9k
How to Diagnose Power Supply Failure?
  • The following situations may cause this issue
  • Case 1: The LED on the power supply does not light up; Case 2: Amp/Preamp does not turn on; Case 3: When plugged into the Amp, both light on the amp & power supply start blinking; Case 4: Amp/Preamp make noise; Case 5: Sound shuts off by itself
  • Possible solution
  • Check if the power supply is illuminated when plugged into AC by itself.

    Plug power supply into a different socket.

    Test the adapter with a meter.

    Try a different power supply (within a range of DC input).

    Test the included power supply on other electrical equipment.

    Please watch the tutorial video by clicking on the link provided. https://youtu.be/yCjygS03zTE
What is a GaN?
  • The GaN supply has a power output of 240W.
  • Offers overload and over-temperature protection.
  • The 48V 5A GaN power supply is also available on Amazon.

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  • 5 stars: 40 (82%)
  • 4 stars: 9 (18%)
  • 3 stars: 0 (0%)
  • 2 stars: 0 (0%)
  • 1 star: 0 (0%)
S
Samuel (United States)
Orange Knob

It’s a knob! Obviously no performance changes but it sure does look pretty!

S
Samuel (United States)
Orange Knob

It��s a knob! Obviously no performance changes but it sure does look pretty!

D
Dennis (United States)
The Orange Knob

It's round, it's orange, it goes to eleven. Can't beat it!

D
Dennis (United States)
The Orange Knob

It's round, it's orange, it goes to eleven. Can't beat it!

R
Roe (United States)

Fosi Audio Replaceable Orange & Grey Knob

B
Brad (United States)
Very pleased with my purchase

I'm really happy with my Fosi Blue Tooth amplifier. I bought it to use with a pair of Polk bookshelf speakers as my garage stereo. The quality of sound is very pleasing and the ease of use is fantastic. I had a different class D amp in use and the Fosi gave me a noticeable improvement in sound quality.

B
Brad (United States)
Very pleased with my purchase

I'm really happy with my Fosi Blue Tooth amplifier. I bought it to use with a pair of Polk bookshelf speakers as my garage stereo. The quality of sound is very pleasing and the ease of use is fantastic. I had a different class D amp in use and the Fosi gave me a noticeable improvement in sound quality.

B
Braskel (United States)

Fosi Audio Replaceable Orange & Grey Knob

B
Braskel (United States)

Fosi Audio Replaceable Orange & Grey Knob

D
Denis (Canada)
New look

It can’t give a different style for hi-fi.

D
Denis (Canada)
New look

It can��t give a different style for hi-fi.

D
Dave (United States)
Knob upgrade

Changed my knob color to orange to better match other Fosi equipment in my collection. Super easy to change. Thanks Fosi!

D
Dave (United States)
Knob upgrade

Changed my knob color to orange to better match other Fosi equipment in my collection. Super easy to change. Thanks Fosi!

T
Timothy (United States)
Orange Knob, nice but not essential

I ordered the orange knob to replace the original black one, for $10.00. With a very small amp face on the BT30D Pro, the orange helps the volume knob to stand out especially to someone not familiar with the setup. So I'm glad I got it. With that said, I believe they should provide the two knob options at no extra cost. I'd even pay $5 over the cost of the amp and feel better about it had they tossed the two knobs into the original package. I mean $10 for a 5 cent piece of plastic?

T
Timothy (United States)
Orange Knob, nice but not essential

I ordered the orange knob to replace the original black one, for $10.00. With a very small amp face on the BT30D Pro, the orange helps the volume knob to stand out especially to someone not familiar with the setup. So I'm glad I got it. With that said, I believe they should provide the two knob options at no extra cost. I'd even pay $5 over the cost of the amp and feel better about it had they tossed the two knobs into the original package. I mean $10 for a 5 cent piece of plastic?

J
Joel (United States)
BT320 pro

Hi I thought was 50w 8 ohm but is not as loud as a 25w Dayton audio HTA100 Integrated Stereo Hybrid Tube Amplifier 100 Watts class D ? Not sure what’s up there also bought Fosi audio amp/ speaker switcher

J
Joel (United States)
BT320 pro

Hi I thought was 50w 8 ohm but is not as loud as a 25w Dayton audio HTA100 Integrated Stereo Hybrid Tube Amplifier 100 Watts class D ? Not sure what��s up there also bought Fosi audio amp/ speaker switcher

K
Kaspar (Estonia)
It looks and feels great..

Some pattern to help with grip would be cool extra to feel under fingers.. but it’s not needed at all.. feels great as is. Insanely overpriced though.. should be an option to all fosi equipment. Or cost like 2 eur max.

K
Kaspar (Estonia)
It looks and feels great..

Some pattern to help with grip would be cool extra to feel under fingers.. but it��s not needed at all.. feels great as is. Insanely overpriced though.. should be an option to all fosi equipment. Or cost like 2 eur max.

J
Jerry (United States)
Orange knobs

Added a nicer look to amp. I received 2 oranges no gray knob. Was i suppose to get two knobs?

J
Jerry (United States)
Orange knobs

Added a nicer look to amp. I received 2 oranges no gray knob. Was i suppose to get two knobs?

M
Mayan (United States)
Looks Amazing

Great addition to my amp. Look Amazing!

M
Mayan (United States)
Looks Amazing

Great addition to my amp. Look Amazing!

J
Joe (United States)
Colorful touch

I think all of your equipment should have an orange colored volume control knob. Also would be nice(helpful) is if it either had a knurled surface or machined texture. I have extremely dry fingers and at times a slick smooth surface makes adjusting/gripping something a challenge??

J
Joe (United States)
Colorful touch

I think all of your equipment should have an orange colored volume control knob. Also would be nice(helpful) is if it either had a knurled surface or machined texture. I have extremely dry fingers and at times a slick smooth surface makes adjusting/gripping something a challenge??

G
Gregory (Jamaica)
Orange Knob

Love it! Gave my P3 a little personality.

G
Gregory (Jamaica)
Orange Knob

Love it! Gave my P3 a little personality.

L
Laurent (France)
Nice touch to harmonize your Fosi hardware

Does exactly what it's supposed to do : replace the BT30D Pro original black volume knob by an orange one in the same shade as the new Fosi Audio hardware devices. Nice touch.

L
Laurent (France)
Nice touch to harmonize your Fosi hardware

Does exactly what it's supposed to do : replace the BT30D Pro original black volume knob by an orange one in the same shade as the new Fosi Audio hardware devices. Nice touch.

P
Peter (South Africa)

Fosi Audio Replaceable Orange & Grey Knob

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