The Solo has one mic preamp and one instrument input (hi-Z for guitar/bass). You cannot plug two mics in. The 2i2 has two combo inputs that accept both XLR mics and TRS instruments. Want to record a podcast interview? You need two mic inputs. Want to record guitar while monitoring through a mic? You need two inputs.
Focusrite Scarlett Solo vs 2i2: Do You Need the Extra Input?
Same brand, $50 difference. The only question is whether one input is enough or you need two.
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Focusrite Scarlett 2i2 (4th Gen) wins overall
Spend the extra $50 for the 2i2. Two preamps gives you flexibility you will eventually need, and it saves buying a second interface later.
Specifications
| Feature | Focusrite Scarlett Solo (4th Gen) | Focusrite Scarlett 2i2 (4th Gen) |
|---|---|---|
| Price | $139 | $189 |
| Inputs | 1x XLR + 1x TRS (instrument) | 2x XLR/TRS combo |
| Preamps | 1 | 2 |
| Sample Rate | 192kHz/24-bit | 192kHz/24-bit |
| Latency | < 3ms | < 3ms |
| Outputs | 2x TRS + headphone | 2x TRS + headphone |
Input Flexibility
2i2. Two inputs is meaningful flexibility, not a gimmick.
Audio Quality
Identical. Same preamp design, same converters, same sample rates, same latency. The only difference is how many inputs you can use at once. The Solo does not sound worse than the 2i2.
Tie. Same audio quality from the same preamp architecture.
Value
The Solo is $139. The 2i2 is $189. That $50 buys you a second preamp, which would cost $100+ as a separate unit. If you ever need a second input - and most people eventually do - the 2i2 saves you from buying a whole new interface. The Solo only makes sense if you are certain you will only ever record one source.
2i2. The $50 premium pays for itself the first time you need two inputs.
If you are 100% certain you will only ever record one mic at a time and never need a second input, save $50 with the Solo. Everyone else should get the 2i2. The second preamp is worth more than the $50 difference.
Frequently Asked Questions
No. The Solo has one XLR preamp and one instrument (hi-Z) input. The instrument input is for guitar or bass, not a microphone.
Yes. Same 4th generation Scarlett preamp design. Same converters. The 2i2 just has two of them.