Product details

The V3, ZA3 amplifiers are equipped with replaceable knobs. Customization of the amplifier's appearance, makes 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.

Tips: The V3, ZA3  knob only fits the V3, ZA3 and is not suitable for installation in other amplifiers.

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: 96 (91%)
  • 4 stars: 6 (6%)
  • 3 stars: 2 (2%)
  • 2 stars: 0 (0%)
  • 1 star: 1 (1%)
G
Gordy M.
Great piece.

This orange knob makes the two amps from Fosi go together great! Great service as always

G
Gordy M.
Great piece.

This orange knob makes the two amps from Fosi go together great! Great service as always

R
Richard U.
Love that I can change knob colors

Now it matches my main amplifier

R
Richard U.
Love that I can change knob colors

Now it matches my main amplifier

A
Aaron M.
Purchased For ZP3

Purchased this black knob to substitute the orange one. The quality is good but I did have to modify the inner plastic bushing to make it fit. But overall I am happy with the results.

A
Aaron M.
Purchased For ZP3

Purchased this black knob to substitute the orange one. The quality is good but I did have to modify the inner plastic bushing to make it fit. But overall I am happy with the results.

G
George
Nice update!

Nice update. Super fast shipping!

G
George
Nice update!

Nice update. Super fast shipping!

h
hiwata
It will become familiar.

The orange knobs on the ZA3 are very eye-catching, but the black knobs look much better in my house.

h
hiwata
It will become familiar.

The orange knobs on the ZA3 are very eye-catching, but the black knobs look much better in my house.

M
Massimo M.
Excellent quality, outstanding service

The orange knobs from Fosi Audio are an excellent purchase: well-built, easy to install, and with a vibrant color that adds personality to the audio setup. They offer a significant aesthetic and tactile improvement over the original knobs, making the system look more professional. Recommended for those seeking quality and style

M
Massimo M.
Excellent quality, outstanding service

The orange knobs from Fosi Audio are an excellent purchase: well-built, easy to install, and with a vibrant color that adds personality to the audio setup. They offer a significant aesthetic and tactile improvement over the original knobs, making the system look more professional. Recommended for those seeking quality and style

N
Nicholas O.
It's a knob

It's a knob. I'm sure it'll knob just fine when it arrives. Unfortunately, it has been sitting at a GOFO distribution center for over a week, so I can't give it a true review. After reading up on GOFO, I won't be surprised if the knob fails to show up.

S
Steven P.
New knob for my Zp3

Works great easy install. Wanted to switch up the look of my unit and this does 100%

S
Steven P.
New knob for my Zp3

Works great easy install. Wanted to switch up the look of my unit and this does 100%

B
Brandon B.
elegant epgrade

simple easy perfect

B
Brandon B.
elegant epgrade

simple easy perfect

D
David
Great

I have two za3 and I noticed the orange knobs had slight different shades of Orange. I contacted Fosi about it and they compensated me directly by reducing the price on one of the ZA3. I ordered a new knob and now they have the same color. Fosi is a great company who really listens to their customers. So friendly and accommodating.

D
David
Great

I have two za3 and I noticed the orange knobs had slight different shades of Orange. I contacted Fosi about it and they compensated me directly by reducing the price on one of the ZA3. I ordered a new knob and now they have the same color. Fosi is a great company who really listens to their customers. So friendly and accommodating.

D
David Å.
Perfect

Good quality material. Easy to replace.

D
David ?.
Perfect

Good quality material. Easy to replace.

A
Antoine L.
Great, but wished I could chose

Great quality machining, tight fit, so works great as replacement, but I’d prefer being able to order with black or orange out of the box.

S
Sunip S.

Fosi Audio Replaceable Orange & Black Knob

S
Sunip S.

Fosi Audio Replaceable Orange & Black Knob

R
Robert L.
It's a Knob

Fits and works like it's supposed to. Everything a knob is, and nothing it isn't.

R
Robert L.
It's a Knob

Fits and works like it's supposed to. Everything a knob is, and nothing it isn't.

J
James B.
Replacement orange knob

The Fosi Orange replacement knob really looks great on the V3! Much easier to see the volume level than the original black one. Great match for my Fosi P4 and P4.

J
James B.
Replacement orange knob

The Fosi Orange replacement knob really looks great on the V3! Much easier to see the volume level than the original black one. Great match for my Fosi P4 and P4.

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