Main trade-off
Yamaha DGX-670
The body is 445 mm deep before allowing for placement and accessories.
Head-to-head
Yamaha DGX-670 vs Casio PX-S3100: Yamaha arranges and records vocals, Casio fits shallow battery-powered setups
The short answer
Choose the DGX-670 for its microphone input, score display and 16-track recorder. Choose the PX-S3100 when the piano must fit a shallow space or work away from an outlet.
Before you choose
The reasoning and the trade-offs
A shared room can make the body shape decisive
DGX-670 is 445 mm deep against 232 mm for PX-S3100. The Casio saves 213 mm of bare depth, nearly half the Yamaha figure. That is a meaningful difference where a piano shares a desk or walkway. Music rests, support and playing clearance still sit outside this body-only calculation.
What this is based on
DGX-670: Depth before music rest 445 mm. PX-S3100: Depth before music rest 232 mm. DGX-670: Listed width 1397 mm. PX-S3100: Listed width 1322 mm. Conditional workflow inference from these documented inputs. No matched performance measurement.
Main trade-off
Casio PX-S3100
The manufacturer's alkaline-battery estimate is about two hours under its conditions.
Yamaha DGX-670
- Choose it for
- You record songs with a microphone connected to the piano
- Main trade-off
- The body is 445 mm deep before allowing for placement and accessories.
Casio PX-S3100
- Choose it for
- Your arranger piano shares a shallow room
- You move practice away from an outlet or busy room
- Main trade-off
- The manufacturer's alkaline-battery estimate is about two hours under its conditions.
About this comparison
Yamaha DGX-670 vs Casio PX-S3100: compare depth before music rest, listed instrument weight, battery operation and the practice routines that change the better choice.
Both offer weighted keys and automatic accompaniment for a player building songs at home. The difference is a deep, self-contained arranging station versus a much shallower battery-capable setup.
Winner by situation
Start with what you need it to do
Your arranger piano shares a shallow room
DGX-670 is 445 mm deep against 232 mm for PX-S3100. The Casio saves 213 mm of bare depth, nearly half the Yamaha figure. That is a meaningful difference where a piano shares a desk or walkway. Music rests, support and playing clearance still sit outside this body-only calculation.
- Yamaha DGX-670
- Good
- Casio PX-S3100
- Better fit
You move practice away from an outlet or busy room
Casio supports AA batteries and is 11.4 kg before batteries, compared with Yamaha's 21.4 kg and mains operation. If you move the piano to wherever the household is quieter, those facts can matter more than recording-track count. Neither battery power nor headphones measures mechanical noise.
- Yamaha DGX-670
- Good
- Casio PX-S3100
- Better fit
You record songs with a microphone connected to the piano
DGX-670 combines a microphone input, USB audio and a 16-track MIDI recorder. PX-S3100 has a three-track recorder and flash-drive audio recording but no listed microphone input. The 16 MIDI tracks do not store vocals. Record the keyboard as a MIDI song first, then use the USB Audio Recorder to capture singing with playback. Compare that complete route before assuming 700 tones make Casio the stronger arranger.
- Yamaha DGX-670
- Better fit
- Casio PX-S3100
- Caution
Two people listen through headphones
PX-S3100 has two sockets. DGX-670 has one. Confirm the exact shared listening arrangement.
- Yamaha DGX-670
- Caution
- Casio PX-S3100
- Better fit
What matters in practice
The differences that matter
A shared room can make the body shape decisive
DGX-670 is 445 mm deep against 232 mm for PX-S3100. The Casio saves 213 mm of bare depth, nearly half the Yamaha figure. That is a meaningful difference where a piano shares a desk or walkway. Music rests, support and playing clearance still sit outside this body-only calculation.
How we reached this conclusion
DGX-670: Depth before music rest 445 mm. PX-S3100: Depth before music rest 232 mm. DGX-670: Listed width 1397 mm. PX-S3100: Listed width 1322 mm. Conditional workflow inference from these documented inputs. No matched performance measurement.
A portable session trades recording depth for easier setup
Casio supports AA batteries and is 11.4 kg before batteries, compared with Yamaha's 21.4 kg and mains operation. If you move the piano to wherever the household is quieter, those facts can matter more than recording-track count. Neither battery power nor headphones measures mechanical noise.
How we reached this conclusion
DGX-670: Listed instrument weight 21.4 kg. PX-S3100: Listed instrument weight 11.4 kg. DGX-670: Battery operation Not established in the checked record. PX-S3100: Battery operation Yes. Conditional workflow inference from these documented inputs. No matched performance measurement.
Recording a song with vocals favors Yamaha's complete route
DGX-670 combines a microphone input, USB audio and a 16-track MIDI recorder. PX-S3100 has a three-track recorder and flash-drive audio recording but no listed microphone input. The 16 MIDI tracks do not store vocals. Record the keyboard as a MIDI song first, then use the USB Audio Recorder to capture singing with playback. Compare that complete route before assuming 700 tones make Casio the stronger arranger.
How we reached this conclusion
DGX-670: Microphone input Yes. PX-S3100: Microphone input Not established in the checked record. DGX-670: Live USB audio interface Yes. PX-S3100: Live USB audio interface No. DGX-670: Internal recorder tracks 16. PX-S3100: Internal recorder tracks 3. Conditional workflow inference from these documented inputs. No matched performance measurement.
Choice A
Yamaha, DGX-670
DGX-670
The DGX-670 puts a score display, microphone input and 16-track recorder in one weighted piano. It makes sense when your routine includes arranging and singing, with a permanent spot for its deeper body.
- Best matched use
- You record songs with a microphone connected to the piano
Checked facts
- Depth before music rest: 445 mm
- Listed instrument weight: 21.4 kg
- Battery operation: Not established in the checked record
- Microphone input: Yes
Choice B
Casio, PX-S3100
PX-S3100
The PX-S3100 puts 200 accompaniment rhythms and a three-track recorder inside the same 232 mm depth as the simpler PX-S1100. Dedicated outputs support a separate speaker setup.
- Best matched use
- Your arranger piano shares a shallow room
Checked facts
- Depth before music rest: 232 mm
- Listed instrument weight: 11.4 kg
- Battery operation: Yes
- Microphone input: Not established in the checked record
Meaningful differences
What changes the fit
| What changes | Yamaha DGX-670 | Casio PX-S3100 | Why it matters |
|---|---|---|---|
| Depth before music rest | 445 mm | 232 mm | Bare depth excludes the music rest, cable route and comfortable playing clearance. |
| Listed instrument weight | 21.4 kg | 11.4 kg | Plan the moving load using the stated measurement basis, then add the stand, case and accessories. |
| Battery operation | Not established in the checked record | Yes | Check this documented difference against the way you plan to practice. |
| Microphone input | Yes | Not established in the checked record | A singing setup needs a documented input and compatible microphone before vocal effects matter. |
| Internal recorder tracks | 16 | 3 | Track allocation and independent overdubbing matter more than a large number alone. |
| Dedicated line outputs | No | Yes | Dedicated outputs keep an external amplification route separate from the headphone sockets. |
What you give up
Every choice has a cost
If you choose Yamaha DGX-670
- One headphone socket and no dedicated line outputs deserve a setup check.
If you choose Casio PX-S3100
- A half-pedal setup requires the optional SP-34, rather than the included switch.
Recommendation switch
The decision flips if...
You record songs with a microphone connected to the piano
Choose Yamaha DGX-670. DGX-670 combines a microphone input, USB audio and a 16-track MIDI recorder. PX-S3100 has a three-track recorder and flash-drive audio recording but no listed microphone input. The 16 MIDI tracks do not store vocals. Record the keyboard as a MIDI song first, then use the USB Audio Recorder to capture singing with playback. Compare that complete route before assuming 700 tones make Casio the stronger arranger.
Your arranger piano shares a shallow room
Choose Casio PX-S3100. DGX-670 is 445 mm deep against 232 mm for PX-S3100. The Casio saves 213 mm of bare depth, nearly half the Yamaha figure. That is a meaningful difference where a piano shares a desk or walkway. Music rests, support and playing clearance still sit outside this body-only calculation.
You require a verified winner for mechanical key noise or personal playing comfort
Choose neither. The manufacturer records do not provide a matched test for those outcomes. Try the instruments in your intended conditions.
What matters in practice
Before you choose
What this comparison cannot tell you
- The comparison uses documented specifications and conditional setup reasoning. We have not measured key feel, mechanical noise or speaker performance side by side.
- Dimensions describe the specified body or cabinet. Leave room for the rest, cables, bench and player.
- Check the exact Amazon model, color, supplied accessories, condition and delivery date before ordering.
What the facts say
What the comparison shows
Useful conclusions from the current digital pianos comparison, followed by the checked facts used to reach them.
See the checked facts and calculation notes
| Product | Needs matched | Checked facts | Source records |
|---|---|---|---|
| Yamaha DGX-670 |
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| Casio PX-S3100 |
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Ready to choose?
Check the price. Read the owner reviews.
Open either model on Amazon to check the current price, customer reviews and delivery options.
Yamaha DGX-670
You record songs with a microphone connected to the piano
See price & reviews on AmazonCasio PX-S3100
Your arranger piano shares a shallow room
See price & reviews on AmazonLinks open in a new tab.