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The SMSL SP200 is a headphone amplifier with RCA and stereo XLR analog inputs. A DAC belongs ahead of it: connect a DAC’s RCA line output to the SP200–s RCA input, or use the DAC’s left/right XLR line outputs with the SP200–s XLR inputs. XLR input connectors only describe the line-level connection between components; they do not, by themselves, establish a claim about the amplifier’s headphone-output topology. The picks below are current DACs or DAC/amp units with a usable line output, stated output voltage, digital formats and retail status.
| # | Product | Price | Where to buy |
|---|---|---|---|
| 1 | SMSL DO100 Pro | $220–$260 | Amazon |
| 2 | Topping E70 Velvet | $400–$450 | Amazon |
| 3 | Topping D50 III | $200–$250 | Amazon |
| 4 | Schiit Modius E | $220–$250 | Amazon |
| 5 | JDS Labs Atom DAC 2 | $145–$150 | Amazon |
| 6 | SMSL SU-1 | $70–$90 | Amazon · eBay |
| 7 | FiiO K11 | $120–$150 | Amazon |
| 8 | FiiO K7 | $190–$230 | Amazon |
| 9 | iFi Zen DAC 3 | $220–$250 | Amazon |
| 10 | Cambridge Audio DacMagic 200M | $550–$600 | Amazon |
The picks, in detail
SMSL DO100 Pro
A current standalone balanced DAC with RCA and XLR line outputs. Its XMOS USB interface supports PCM to 32-bit/768 kHz and DSD512, so it can feed the SP200 by either RCA or stereo XLR.
- RCA and XLR line outputs
- PCM 32-bit/768 kHz
- DSD512 via USB
- Both SP200 input types available
- Current model
- Use line outputs, not headphone outputs
- XLR cables add cost
Topping E70 Velvet
The E70 Velvet is a current standalone DAC with 4 Vrms XLR and 2 Vrms RCA outputs, selectable DAC or preamp operation, and USB PCM 768 kHz/DSD512 support. Set it to a sensible fixed or controlled line level before the SP200.
- 4 Vrms XLR and 2 Vrms RCA
- PCM 768 kHz and DSD512
- USB, optical and coaxial inputs
- Direct XLR or RCA connection choice
- Line-output voltage is documented
- Higher-priced DAC
- Manage gain and volume carefully
Topping D50 III
The D50 III is a current compact DAC with RCA and XLR line outputs, specified at 2 Vrms RCA and 4 Vrms XLR. Its USB input handles PCM to 768 kHz and DSD512, making it a compact companion for the SP200.
- 2 Vrms RCA and 4 Vrms XLR
- PCM 768 kHz and DSD512
- USB, optical and coaxial inputs
- Both analog connection types
- Compact desktop footprint
- Separate power and signal-cable planning
- Do not confuse its XLR line output with a headphone output
Schiit Modius E
Modius E is a current DAC with independent balanced XLR and single-ended RCA outputs. It supports USB, optical, coaxial and AES digital inputs and a maximum 24-bit/192 kHz sampling rate, with 4 Vrms XLR and 2 Vrms RCA line levels.
- 4 Vrms XLR and 2 Vrms RCA
- USB, optical, coaxial and AES inputs
- 24-bit/192 kHz maximum
- Flexible digital-input selection
- Simultaneous independent analog outputs
- No DSD format support
- Requires USB power when not using USB as source
JDS Labs Atom DAC 2
Atom DAC 2 is a current RCA-only DAC, so pair it to the SP200–s RCA input. It provides a 2.0 Vrms maximum line output; USB supports PCM through 32-bit/384 kHz and DSD64–128, while optical supports PCM through 24-bit/192 kHz.
- 2.0 Vrms RCA output
- USB-C and optical inputs
- PCM 32-bit/384 kHz and DSD64–128
- Clear RCA connection to SP200
- In stock direct at $149
- No XLR line outputs
- External AC transformer
SMSL SU-1
The SU-1 is a compact current DAC with a 2 Vrms RCA line output, USB, optical and coaxial inputs, and USB support for PCM to 32-bit/768 kHz and DSD512. It is the simple RCA-only route into the SP200.
- 2 Vrms RCA line output
- PCM 32-bit/768 kHz
- DSD512
- Low-cost standalone DAC
- RCA output matches SP200 RCA input
- No XLR line outputs
- No volume-control role in a fixed DAC setup
FiiO K11
FiiO’s current K11 is a DAC/headphone amp that can also provide a 2 Vrms RCA line output for the SP200. Its USB input supports PCM to 32-bit/384 kHz and DSD256; use the rear line output, not its front headphone jacks, when adding the SP200.
- 2 Vrms RCA line output
- USB PCM 32-bit/384 kHz
- DSD256
- Compact desktop unit
- Can serve as a source DAC for the SP200
- It is also a headphone amp, which is redundant with SP200
- No XLR line output
FiiO K7
The current FiiO K7 DAC/amp has 2 Vrms RCA and 4 Vrms XLR line outputs, plus USB PCM to 32-bit/384 kHz and DSD256. Its rear line outputs can feed either SP200 input; its own headphone outputs are not part of that connection.
- 2 Vrms RCA and 4 Vrms XLR line outputs
- PCM 32-bit/384 kHz
- DSD256
- Both line-output types
- Current widely available desktop model
- Headphone amplifier is redundant if using SP200
- Set the line-output mode deliberately
iFi Zen DAC 3
Zen DAC 3 is a current USB DAC/headphone amp with RCA line output for the SP200–s RCA input. It accepts USB PCM to 32-bit/768 kHz and DSD512; use the rear RCA connection when the SP200 is the headphone amplifier.
- RCA line output
- USB PCM 32-bit/768 kHz
- DSD512
- Small current USB DAC
- High-resolution USB formats
- No stereo XLR line output for SP200
- Integrated headphone amp is redundant in this stack
Cambridge Audio DacMagic 200M
The DacMagic 200M is a current standalone DAC with 2.1 Vrms RCA and 4.2 Vrms balanced XLR outputs. USB supports PCM to 32-bit/768 kHz and DSD512, giving the SP200 either a conventional RCA or XLR line-level source.
- 2.1 Vrms RCA and 4.2 Vrms XLR
- PCM 32-bit/768 kHz
- DSD512
- Both SP200 input options
- Standalone DAC rather than a second amp
- Substantially higher price
- Large-format support depends on the USB source
Buying tips
- Use only the DAC’s rear line outputs to feed the SP200: RCA-to-RCA or left/right XLR-to-XLR as appropriate.
- Start with conservative volume and gain settings. A DAC in variable preamp mode can deliver a changing line level into the SP200.
- Choose XLR only when both the DAC and SP200 have the needed stereo line connections; it is not a shortcut to making a claim about headphone-drive topology.
- USB format limits describe the source-to-DAC link. They do not improve a recording by themselves, and optical/coaxial limits can differ from USB.
As an Amazon Associate and eBay Partner, toptenpick.com earns from qualifying purchases. Prices and availability are subject to change.