Fosi Audio V3 Stereo Amplifier 48V
- Up to 600W output, drives 2 to 8 ohm speakers
- TPA3255 class D chip with NCC, ELNA and WIMA capacitors, Sumida inductors
- Up to 88dB SINAD, up to 110dB SNR
- 140uV noise floor listed
- Swappable NE5532 op-amps, accepts 8-pin dual op-amps
- 24 month manufacturer warranty, power supply included
Last refreshed Jun 20, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A compact amplifier with real headroom and socketed op-amps for listeners who like to tinker. The listing never names its input connections, so check them against your source first.
As an Amazon Associate I earn from qualifying purchases. ProductDome earns a commission when you buy through links on this page.
ASIN: B0CGCSM191Model: V3_48V/5ACategory: Stereo Amplifiers
Overview
Fosi Audio makes this compact class D power amplifier to drive speakers on a bookshelf, a desktop or in a home theater. Heat leaves through vents on the top and bottom of the case, and the whole body works as a heatsink.
Tinkerers get room to play here, since the stock op-amps come out of their sockets and a long list of dual op-amps can replace them. A pre-out tied to the volume knob adds a path to a second amp or powered device. On the downside, the input types are never described, so source compatibility has to be confirmed before ordering.
Who it's for
Desks, bookshelves and home theater corners suit this amp, especially for owners who enjoy changing op-amps to shape the sound. Someone who wants an all-in-one receiver with streaming and clearly listed inputs should look at a different design.
Pros and cons
- Socketed op-amps invite sound tuning
- Pre-out level follows the volume control
- Low claimed noise floor
- Whole-body heatsink with top and bottom vents
- Input connections not listed
- Power quoted only as an up-to figure
- Op-amp upgrades are extra parts to source
Performance notes
Delivered power depends on the impedance of the connected speakers, and the amp is rated across the common low to medium range. A low noise floor matters most with sensitive speakers at close range, where idle hiss is easiest to hear. Sound character also shifts with whichever op-amps sit in the sockets, and passive cooling through the vents governs how it holds up during long, loud sessions.
Specifications
| Brand | Fosi Audio |
|---|---|
| Model | V3_48V/5A |
| Capacity & performance | |
| Cooling | Top and bottom vents, whole-body heatsink |
| Noise floor | 140 uV |
| Signal to noise ratio | Up to 110 dB |
| Included components | |
| Included Components | Power Supply |
| Warranty & support | |
| Warranty Description | 2 years |
| Other details | |
| Impedance | 2 ohms |
| Amplifier chip | TPA3255 Class D |
| Op amps | NE5532 stock, swappable with 8-pin dual op-amps |
| Pre out | Yes, level follows volume control |
| Sinad | Up to 88 dB |
Frequently asked questions
Does the Fosi Audio V3 need extra ventilation?
The case has vents on the top and bottom, and the whole body acts as a heatsink. Leave both vent areas uncovered, so avoid stacking gear on top of it or setting it on a soft surface.
Which op-amps can I swap into the Fosi Audio V3?
It ships with NE5532 op-amps and accepts 8-pin dual op-amps. The listing names Sparkos SS3602, MUSES02, OPA2604, OPA2134PA, OP249, AD827, RM4559, LM4562 and LME49720HA as examples.
Does the volume knob control the Fosi V3 pre-out?
Yes. The pre-out level follows the volume control, so a device connected to the pre-out changes level along with the main volume.
Is the Fosi Audio V3 a full receiver with inputs and streaming?
The listing describes a power amplifier and does not list its input types, wireless features or a tuner. Check the input connections against your source before ordering.