The catch
Denon AVR-X3900H
Its rear panel has six inputs, so a seventh HDMI source does not fit.
Side by side
Denon AVR-X3900H vs AVR-X4800H: X4800H gets a seventh HDMI socket, but both still need an external amp for 7.1.4
Quick verdict
If six HDMI inputs cover your room, AVR-X3900H is the pick, especially when its offer leaves more budget for speakers. A seventh HDMI source that needs a permanent socket points to AVR-X4800H. Each runs 5.1.4 on its own, and each needs two external amplifier channels for 7.1.4.
Before you buy
Why, and what it costs you
Either 7.1.4 plan is completed by the same two-channel amplifier
Eleven amplifier channels are required for seven ear-level speakers and four heights, and each receiver supplies nine. With X4800H, an eleven-speaker plan still involves buying an external amplifier.
Where this comes from
7 + 4 = 11 main speakers. Each processes 11 and amplifies 9. For the remaining 11 - 9 = 2 channels, the manuals document an external two-channel amplifier.
The catch
Denon AVR-X4800H
Nine built-in amps are still not enough to power 7.1.4 alone.
Denon AVR-X3900H
- Why pick it
- Your nine-speaker room has six HDMI sources
- The lower current offer gives you the same 7.1.4 expansion path
- The catch
- Its rear panel has six inputs, so a seventh HDMI source does not fit.
Denon AVR-X4800H
- Why pick it
- Seven HDMI sources stay plugged in with no switch needed
- You want the higher published two-channel power rating
- The catch
- Nine built-in amps are still not enough to power 7.1.4 alone.
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What this page compares
Denon AVR-X3900H against AVR-X4800H for seven HDMI devices, 7.1.4 expansion and four subwoofers, sorting useful upgrades from capabilities they share.
If six HDMI inputs cover your room, AVR-X3900H is the pick, especially when its offer leaves more budget for speakers. A seventh HDMI source that needs a permanent socket points to AVR-X4800H. Each runs 5.1.4 on its own, and each needs two external amplifier channels for 7.1.4.
Which one fits
Pick the situations that sound like you
I want 5.1.4 and no separate amplifier
On either receiver, nine built-in channels drive five ear-level speakers and four heights.
- Denon AVR-X3900H
- Good
- Denon AVR-X4800H
- Good
I need the receiver by itself to deliver 7.1.4
Each processes eleven channels yet holds just nine amplifiers.
- Denon AVR-X3900H
- Not suitable
- Denon AVR-X4800H
- Not suitable
I want to keep seven HDMI sources plugged in
Seven inputs on X4800H, six on X3900H.
- Denon AVR-X3900H
- Not suitable
- Denon AVR-X4800H
- Better fit
I want four sub connections that adjust independently
Four independent subwoofer outputs come with each. That does not guarantee the same bass results in a room.
- Denon AVR-X3900H
- Good
- Denon AVR-X4800H
- Good
In practice
Differences you will notice
Either 7.1.4 plan is completed by the same two-channel amplifier
Eleven amplifier channels are required for seven ear-level speakers and four heights, and each receiver supplies nine. With X4800H, an eleven-speaker plan still involves buying an external amplifier.
How we worked this out
7 + 4 = 11 main speakers. Each processes 11 and amplifies 9. For the remaining 11 - 9 = 2 channels, the manuals document an external two-channel amplifier.
Adding a seventh source brings a real break point
A console, a gaming PC and four other HDMI devices fill X3900H. One more device and X4800H can still keep everything connected directly. With fewer devices than that, the extra input stays spare.
How we worked this out
The example counts 1 console + 1 PC + 4 other sources = 6 inputs. A seventh goes one past X3900H and fills X4800H. Every listed input supports 4K120, subject to format limits.
The jump in power is about 19% in one specific test
The 125 W figure sits 20 W above 105 W, which is about 19%. It is a published stereo-test difference. It does not mean movies will sound 19% louder, and it does not mean nine speakers receive those wattages at the same time.
How we worked this out
(125 - 105) / 105 × 100 = 19.0%. Each stated rating is with two channels driven at 8 ohms, across 20 Hz to 20 kHz, at 0.08% THD.
Plan your receiver connectionsLay out my system
Check a documented speaker layout against HDMI sources and external-amplifier plans.
Denon AVR-X3900H
Handles your setup
Runs 5.1.2 on its own built-in amplifiers. Takes 3 HDMI devices, 1 of them at 4K/120Hz.
Denon AVR-X4800H
Handles your setup
Runs 5.1.2 on its own built-in amplifiers. Takes 3 HDMI devices, 1 of them at 4K/120Hz.
A powered subwoofer does not count toward the speaker channels. This checks one main room. Check Zone 2, bi-amping and unusual speaker assignments yourself. Leave room for ventilation, and confirm HDMI settings, cables and speaker impedance before you install.
Option A
Denon, AVR-X3900H
AVR-X3900H
You can run 5.1.4 today on the nine built-in amplifiers and eleven-channel processing, then reach 7.1.4 by adding an external stereo amp. Four independent sub outputs make a more involved bass setup possible.
- Best for
- Growing from 5.1.4 to 7.1.4 in stages
Facts we checked
- Powered / processed main channels: 9 / 11
- HDMI inputs: 6, all with 4K120 support
- HDMI outputs: 2 main plus 1 Zone 2
- Subwoofer outputs: 4 independently adjustable
Option B
Denon, AVR-X4800H
AVR-X4800H
Seven fast HDMI inputs and four independent sub outputs come with this nine-amplifier receiver, which has eleven processing channels. It fits a big source collection and a possible external-amp expansion down the road.
- Best for
- Seven fast sources and room to grow into 7.1.4
Facts we checked
- Powered / processed main channels: 9 / 11
- HDMI inputs: 7, all with 4K120 support
- HDMI outputs: 2 main plus 1 Zone 2
- Subwoofer outputs: 4 independently adjustable
Spec by spec
Where they really differ
| Spec | Denon AVR-X3900H | Denon AVR-X4800H | In practice |
|---|---|---|---|
| Powered / processed main channels | 9 / 11 | 9 / 11 | To power eleven main speakers, each needs two more amplifier channels. |
| HDMI inputs | 6, all with 4K120 support | 7, all with 4K120 support | One more high-frame-rate source connects straight to X4800H. |
| HDMI outputs | 2 main plus 1 Zone 2 | 2 main plus 1 Zone 2 | Having three sockets does not give you three main-room displays you can select independently. |
| Subwoofer outputs | 4 independently adjustable | 4 independently adjustable | Four subwoofer connections can be set up separately on either. Placement and calibration still count. |
| Included room correction | Audyssey MultEQ XT32 | Audyssey MultEQ XT32 | Both come with the same Audyssey tier. Paid Dirac options must be bought separately. |
| Published stereo power | 105 W per channel | 125 W per channel | Each figure is based on 8 ohms, 20 Hz to 20 kHz and 0.08% distortion with two channels driven. |
Trade-offs
What each pick costs you
With Denon AVR-X3900H
- In the published two-channel test, its rating of 105 W is lower.
With Denon AVR-X4800H
- A higher power rating does not prove audible improvement or all-channel output.
Change of plan
When the answer changes
All seven HDMI sources need a direct connection
Go with Denon AVR-X4800H. X4800H has the seventh socket.
Six inputs do the job, and X3900H costs less
Go with Denon AVR-X3900H. The main-channel and four-subwoofer capabilities are still there.
I need eleven amplifier channels built in
Neither model fits. Nine amplifiers are in each receiver. Pick a model with eleven amplifiers, or plan for an external amp.
Decision guide
How to decide
AVR-X3900H fits a room covered by six HDMI inputs, particularly if its offer frees up more budget for speakers. AVR-X4800H fits when a seventh HDMI source needs a permanent socket. Both run 5.1.4 on their own and need two external amplifier channels to reach 7.1.4.
Count sockets before you step up
Valuing the seventh HDMI input is simple, since it either saves you an extra switch or sits unused. Write down the devices that must stay connected, occasional sources included. When the total is six or fewer, compare the current offers keeping the shared speaker and subwoofer capacity in mind.
Keep budget aside for the entire Atmos system
With either receiver, a 7.1.4 installation takes eleven main speakers and two external amplifier channels. Cables, placement and installation belong in that plan too. The higher model number on the X4800H does not make those extra amplifier channels go away.
Stereo wattage is not a sound-quality ranking
Both the 105 W and 125 W ratings come from the same published two-channel conditions, which makes the arithmetic comparable. The practical demand still depends on your speakers, listening distance and room. We have no measurements that show which receiver sounds better in your system.
What this page can’t tell you
- This page deals with US connections and speaker layouts. We have no measurements of amplifier output, room-correction results or sound quality. HDMI format, firmware and display compatibility remain open checks.
By the numbers
What the data shows
What we found across the AV receivers we compare, plus the checked facts behind each finding.
Show the facts and the math
Ready to buy
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Denon AVR-X3900H
Your nine-speaker room has six HDMI sources
See price & reviews on AmazonDenon AVR-X4800H
Seven HDMI sources stay plugged in with no switch needed
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