The catch
Yamaha DGX-670
At 445 mm, the body is deep before you account for placement and accessories.
Side by side
Yamaha DGX-670 vs Casio PX-S3100: Casio fits shallow battery-powered setups, while Yamaha arranges and records vocals
Quick verdict
The DGX-670 is the pick for its microphone input, score display and 16-track recorder. If the piano has to fit a shallow space or work away from an outlet, choose the PX-S3100.
Before you buy
Why, and what it costs you
In a shared room, body shape can decide the matter
The DGX-670 is 445 mm deep, against 232 mm for the PX-S3100. That means the Casio saves 213 mm of bare depth, nearly half the Yamaha figure. The difference matters where a piano shares a desk or walkway. This body-only calculation leaves out music rests, support and playing clearance.
Where this comes from
Depth before music rest: DGX-670 445 mm, PX-S3100 232 mm. Listed width: DGX-670 1397 mm, PX-S3100 1322 mm. This is a conditional workflow inference drawn from these documented inputs. There is no matched performance measurement.
The catch
Casio PX-S3100
The manufacturer estimates about two hours on alkaline batteries, under its stated conditions.
Yamaha DGX-670
- Why pick it
- A microphone plugged into the piano is how you record songs
- The catch
- At 445 mm, the body is deep before you account for placement and accessories.
Casio PX-S3100
- Why pick it
- A shallow room is shared with your arranger piano
- Practice sometimes leaves the outlet or the busy room behind
- The catch
- The manufacturer estimates about two hours on alkaline batteries, under its stated conditions.
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What this page compares
Yamaha DGX-670 vs Casio PX-S3100, compared on depth before music rest, listed instrument weight and battery operation, along with the practice routines that decide the better choice.
Weighted keys and automatic accompaniment come on both, for a player building songs at home. What differs is a deep, self-contained arranging station on one side and a much shallower battery-capable setup on the other.
Which one fits
Pick the situations that sound like you
A shallow room is shared with your arranger piano
The DGX-670 is 445 mm deep, against 232 mm for the PX-S3100. That means the Casio saves 213 mm of bare depth, nearly half the Yamaha figure. The difference matters where a piano shares a desk or walkway. This body-only calculation leaves out music rests, support and playing clearance.
- Yamaha DGX-670
- Good
- Casio PX-S3100
- Better fit
Practice sometimes leaves the outlet or the busy room behind
The Casio can run on AA batteries and weighs 11.4 kg before batteries, while the Yamaha is 21.4 kg and runs on mains power. If you carry the piano to whichever part of the household is quieter, those facts can count for more than the number of recording tracks. Neither battery power nor headphones measures mechanical noise.
- Yamaha DGX-670
- Good
- Casio PX-S3100
- Better fit
A microphone plugged into the piano is how you record songs
A microphone input, USB audio and a 16-track MIDI recorder come together in the DGX-670. The PX-S3100 has a three-track recorder and flash-drive audio recording, but no listed microphone input. Vocals cannot be stored on the 16 MIDI tracks. First record the keyboard as a MIDI song, then capture the singing with playback using the USB Audio Recorder. Compare that complete route before assuming 700 tones make Casio the stronger arranger.
- Yamaha DGX-670
- Better fit
- Casio PX-S3100
- Caution
Headphones need to serve two listeners
Two sockets are on the PX-S3100, one on the DGX-670. Confirm the exact arrangement for shared listening.
- Yamaha DGX-670
- Caution
- Casio PX-S3100
- Better fit
In practice
Differences you will notice
In a shared room, body shape can decide the matter
The DGX-670 is 445 mm deep, against 232 mm for the PX-S3100. That means the Casio saves 213 mm of bare depth, nearly half the Yamaha figure. The difference matters where a piano shares a desk or walkway. This body-only calculation leaves out music rests, support and playing clearance.
How we worked this out
Depth before music rest: DGX-670 445 mm, PX-S3100 232 mm. Listed width: DGX-670 1397 mm, PX-S3100 1322 mm. This is a conditional workflow inference drawn from these documented inputs. There is no matched performance measurement.
A portable session gives up recording depth for an easier setup
The Casio can run on AA batteries and weighs 11.4 kg before batteries, while the Yamaha is 21.4 kg and runs on mains power. If you carry the piano to whichever part of the household is quieter, those facts can count for more than the number of recording tracks. Neither battery power nor headphones measures mechanical noise.
How we worked this out
Listed instrument weight: DGX-670 21.4 kg, PX-S3100 11.4 kg. Battery operation: DGX-670 Not established in the checked record, PX-S3100 Yes. This is a conditional workflow inference drawn from these documented inputs. There is no matched performance measurement.
For a song with vocals, Yamaha offers the complete route
A microphone input, USB audio and a 16-track MIDI recorder come together in the DGX-670. The PX-S3100 has a three-track recorder and flash-drive audio recording, but no listed microphone input. Vocals cannot be stored on the 16 MIDI tracks. First record the keyboard as a MIDI song, then capture the singing with playback using the USB Audio Recorder. Compare that complete route before assuming 700 tones make Casio the stronger arranger.
How we worked this out
Microphone input: DGX-670 Yes, PX-S3100 Not established in the checked record. Live USB audio interface: DGX-670 Yes, PX-S3100 No. Internal recorder tracks: DGX-670 16, PX-S3100 3. This is a conditional workflow inference drawn from these documented inputs. There is no matched performance measurement.
Option A
Yamaha, DGX-670
DGX-670
A score display, microphone input and 16-track recorder share one weighted piano in the DGX-670. If your routine includes arranging and singing, it makes sense, as long as you have a permanent spot for the deeper body.
- Best for
- A microphone plugged into the piano is how you record songs
Facts we checked
- Depth ahead of the music rest: 445 mm
- Instrument weight as listed: 21.4 kg
- Battery operation: The checked record does not establish it
- Microphone input: Present
Option B
Casio, PX-S3100
PX-S3100
Inside the same 232 mm depth as the simpler PX-S1100, the PX-S3100 fits 200 accompaniment rhythms and a three-track recorder. Dedicated outputs let you connect separate speakers.
- Best for
- A shallow room is shared with your arranger piano
Facts we checked
- Depth ahead of the music rest: 232 mm
- Instrument weight as listed: 11.4 kg
- Battery operation: Supported
- Microphone input: The checked record does not establish it
Spec by spec
Where they really differ
| Spec | Yamaha DGX-670 | Casio PX-S3100 | In practice |
|---|---|---|---|
| Depth before music rest | 445 mm | 232 mm | The music rest, cable route and comfortable playing clearance are all left out of bare depth. |
| Listed instrument weight | 21.4 kg | 11.4 kg | Work out the load you will be moving from the stated measurement basis, and then add the stand, case and accessories. |
| Battery operation | Not established in the checked record | Yes | Weigh this documented difference against how you plan to practice. |
| Microphone input | Yes | Not established in the checked record | Before vocal effects count for anything, a singing setup needs a documented input and a compatible microphone. |
| Internal recorder tracks | 16 | 3 | A large number by itself counts for less than track allocation and independent overdubbing. |
| Dedicated line outputs | No | Yes | With dedicated outputs, the route to external amplification stays apart from the headphone sockets. |
Trade-offs
What each pick costs you
With Yamaha DGX-670
- With one headphone socket and no dedicated line outputs, check your setup first.
With Casio PX-S3100
- The included switch will not do half-pedaling. For that you need the optional SP-34.
Change of plan
When the answer changes
A microphone plugged into the piano is how you record songs
Go with Yamaha DGX-670. A microphone input, USB audio and a 16-track MIDI recorder come together in the DGX-670. The PX-S3100 has a three-track recorder and flash-drive audio recording, but no listed microphone input. Vocals cannot be stored on the 16 MIDI tracks. First record the keyboard as a MIDI song, then capture the singing with playback using the USB Audio Recorder. Compare that complete route before assuming 700 tones make Casio the stronger arranger.
A shallow room is shared with your arranger piano
Go with Casio PX-S3100. The DGX-670 is 445 mm deep, against 232 mm for the PX-S3100. That means the Casio saves 213 mm of bare depth, nearly half the Yamaha figure. The difference matters where a piano shares a desk or walkway. This body-only calculation leaves out music rests, support and playing clearance.
You need a verified winner on mechanical key noise or on personal playing comfort
Neither model fits. Manufacturer records contain no matched test for those outcomes. Try the instruments under the conditions you intend to play in.
Decision guide
How to decide
In a shared room, body shape can decide the matter
The DGX-670 is 445 mm deep, against 232 mm for the PX-S3100. That means the Casio saves 213 mm of bare depth, nearly half the Yamaha figure. The difference matters where a piano shares a desk or walkway. This body-only calculation leaves out music rests, support and playing clearance.
A portable session gives up recording depth for an easier setup
The Casio can run on AA batteries and weighs 11.4 kg before batteries, while the Yamaha is 21.4 kg and runs on mains power. If you carry the piano to whichever part of the household is quieter, those facts can count for more than the number of recording tracks. Neither battery power nor headphones measures mechanical noise.
For a song with vocals, Yamaha offers the complete route
A microphone input, USB audio and a 16-track MIDI recorder come together in the DGX-670. The PX-S3100 has a three-track recorder and flash-drive audio recording, but no listed microphone input. Vocals cannot be stored on the 16 MIDI tracks. First record the keyboard as a MIDI song, then capture the singing with playback using the USB Audio Recorder. Compare that complete route before assuming 700 tones make Casio the stronger arranger.
What this page can’t tell you
- This comparison rests on documented specifications and conditional reasoning about your setup. We have not put key feel, mechanical noise or speaker performance side by side and measured them.
- The dimensions given are for the specified body or cabinet. Allow space as well for the rest, cables, bench and player.
- Before you order, verify the exact Amazon model, color, supplied accessories, condition and delivery date.
By the numbers
What the data shows
What we found across the digital pianos we compare, plus the checked facts behind each finding.
Show the facts and the math
| Product | Needs it meets | Facts we checked | Sources |
|---|---|---|---|
| Yamaha DGX-670 |
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| Casio PX-S3100 |
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Ready to buy
See today’s price and what owners say
Open either model on Amazon for the current price, customer reviews and delivery options.
Yamaha DGX-670
A microphone plugged into the piano is how you record songs
See price & reviews on AmazonCasio PX-S3100
A shallow room is shared with your arranger piano
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