Main trade-off
Denon AVR-X3900H
Dirac room correction is an extra purchase.
Head-to-head
Denon AVR-X3900H vs Onkyo TX-RZ50: Denon separates four subs, Onkyo includes Dirac, both need an amp for 7.1.4
The short answer
Choose X3900H for four independent sub outputs and a separate Zone 2 HDMI path. Choose RZ50 for Dirac included, a front HDMI socket and a seventh source input. Both need a stereo power amplifier for 7.1.4.
Before you choose
The reasoning and the trade-offs
7.1.4 requires the same added amplifier count
Neither model removes the need for two external amplifier channels in an eleven-speaker room.
What this is based on
Both have nine built-in amplifiers and eleven-channel main processing.
Main trade-off
Onkyo TX-RZ50
Subwoofer outputs share the same signal.
Denon AVR-X3900H
- Choose it for
- Each subwoofer needs separate receiver adjustment
- Two main-room displays and a Zone 2 display are planned
- Main trade-off
- Dirac room correction is an extra purchase.
Onkyo TX-RZ50
- Choose it for
- Full-bandwidth Dirac should be included
- A temporary front HDMI device joins six rear sources
- Main trade-off
- Subwoofer outputs share the same signal.
About this comparison
Compare Denon X3900H and Onkyo RZ50 for external-amp 7.1.4, independent sub control, included Dirac, front HDMI access and display routing.
Choose X3900H for four independent sub outputs and a separate Zone 2 HDMI path. Choose RZ50 for Dirac included, a front HDMI socket and a seventh source input. Both need a stereo power amplifier for 7.1.4.
Winner by situation
Start with what you need it to do
Four independently controlled sub outputs
RZ50 has two jacks carrying the same signal.
- Denon AVR-X3900H
- Better fit
- Onkyo TX-RZ50
- Caution
Full-bandwidth Dirac must be included
Denon offers it as a separately licensed upgrade.
- Denon AVR-X3900H
- Depends
- Onkyo TX-RZ50
- Better fit
A seventh front-access HDMI source
X3900H has six rear HDMI inputs.
- Denon AVR-X3900H
- Caution
- Onkyo TX-RZ50
- Better fit
7.1.4 with a stereo amplifier available
Both process eleven channels and require the additional amplifier pair.
- Denon AVR-X3900H
- Good
- Onkyo TX-RZ50
- Good
What matters in practice
The differences that matter
7.1.4 requires the same added amplifier count
Neither model removes the need for two external amplifier channels in an eleven-speaker room.
How we reached this conclusion
Both have nine built-in amplifiers and eleven-channel main processing.
Four sub cables do not require a splitter on the Denon
X3900H supplies four independent sub connections, while RZ50 has two parallel-signal jacks.
How we reached this conclusion
The manufacturers document four independent Denon sub outputs and the same signal from both Onkyo sub outputs.
A seventh source need not be a seventh fast source
RZ50's extra front input helps temporary devices, while both have six fast rear inputs.
How we reached this conclusion
RZ50 has seven total HDMI inputs and six 4K120-capable inputs. X3900H has six of each.
Plan your receiver connectionsPlan my setup
Check a documented speaker layout against HDMI sources and external-amplifier plans.
Denon AVR-X3900H
Supports your setup
Supports 5.1.2 using the receiver's own amplifiers. Connects 3 HDMI devices, including 1 at 4K/120Hz.
Onkyo TX-RZ50
Supports your setup
Supports 5.1.2 using the receiver's own amplifiers. Connects 3 HDMI devices, including 1 at 4K/120Hz. Input count does not guarantee every chroma, bit-depth or DSC combination. Check the manufacturer's HDMI format table and current firmware.
A powered subwoofer is separate from the speaker-channel count. This checks one main room. Zone 2, bi-amping and unusual speaker assignments need another manual check. Allow ventilation space and confirm HDMI settings, cables and speaker impedance before installing.
Choice A
Denon, AVR-X3900H
AVR-X3900H
Nine built-in amplifiers and eleven-channel processing allow 5.1.4 now and 7.1.4 with an external stereo amp. Four independent sub outputs support a more involved bass setup.
- Best matched use
- A staged move from 5.1.4 to 7.1.4
Checked facts
- 9 built-in amplifier channels and 11 main processing channels
- 6 HDMI inputs, including 6 supporting 4K120 video
- 3 HDMI outputs documented in the NA manual, including 2 main-room outputs
- Audyssey MultEQ XT32 room setup
- 11 full-range main-channel pre-outs, excluding subwoofer outputs
- 6.6-inch chassis height with antennas horizontal, before ventilation space
- 4 independent subwoofer outputs
Choice B
Onkyo, TX-RZ50
TX-RZ50
Nine built-in amplifiers and eleven-channel processing support a later 7.1.4 system with an external stereo amp. Dirac Live Room Correction and a front HDMI input are included.
- Best matched use
- Dirac now with 7.1.4 expansion later
Checked facts
- 9 built-in amplifier channels and 11 main processing channels
- 7 HDMI inputs, including 6 supporting 4K120 video
- 2 HDMI outputs
- Dirac Live Full Bandwidth room setup
- 11 full-range main-channel pre-outs, excluding subwoofer outputs
- 7.9375-inch chassis height with antennas horizontal, before ventilation space
Meaningful differences
What changes the fit
| What changes | Denon AVR-X3900H | Onkyo TX-RZ50 | Why it matters |
|---|---|---|---|
| Subwoofer outputs | 4 independent | 2 carrying the same signal | The Denon offers separate output adjustment for a larger subwoofer system. |
| Included correction | Audyssey MultEQ XT32, Dirac optional | Dirac Live Full Bandwidth included | The Onkyo includes the Dirac Room Correction license. |
| HDMI source inputs | 6 rear | 6 rear plus 1 front | RZ50 has a seventh input without reaching behind the rack. |
| HDMI display outputs | 3, including separate Zone 2 | 2 | X3900H adds a distinct Zone 2 connection, subject to input-routing rules. |
| Maximum documented height channels | 6 in a supported 5.1.6 arrangement with external amplification | 4 | X3900H supports an additional height pair in a different supported layout. |
| Published two-channel power | 105W into 8 ohms | 120W into 8 ohms | Both ratings use 20Hz to 20kHz and 0.08% distortion with two channels driven. |
What you give up
Every choice has a cost
If you choose Denon AVR-X3900H
- No seventh or front HDMI input.
If you choose Onkyo TX-RZ50
- Only two HDMI outputs and four documented height channels.
Recommendation switch
The decision flips if...
Each subwoofer needs separate receiver adjustment
Choose Denon AVR-X3900H. Its four independent subwoofer outputs support separate receiver adjustment.
Full-bandwidth Dirac should be included
Choose Onkyo TX-RZ50. Its full-bandwidth Dirac Live license is included, without an added base room-correction license purchase.
The requirement is 7.1.4 with no external power amplifier
Choose neither. The documented processing or internal-amplifier layouts do not cover this requirement. Choose a receiver with the required physical configuration.
What matters in practice
How to make the call
The amplifier purchase does not separate them
Both receivers can run 5.1.4 from their own amplifiers and expand to 7.1.4 with a stereo power amp. Choose the supported amp assignment before connecting the extra pair. If avoiding another amplifier is the objective, neither receiver meets it for eleven full-range speakers. An eleven-amplifier model is the more direct solution.
Subwoofer topology is a stronger distinction
X3900H gives four subwoofers independently adjustable outputs. RZ50's two jacks carry the same signal, so they do not offer that same receiver-level separation. This does not prove that two subs will sound worse on the Onkyo. It identifies where independent alignment must happen through placement, sub controls or other equipment, and where the receiver itself provides separate adjustments.
Separate included software from connections
RZ50 includes full-bandwidth Dirac Live Room Correction. The Denon includes Audyssey MultEQ XT32 and offers Dirac as an extra. The Onkyo also puts a seventh HDMI input on the front. The Denon answers with a third HDMI output for Zone 2. Check the Zone 2 source restrictions before treating that output as an unrestricted matrix switch.
What this comparison cannot tell you
- Independent subwoofer connections do not guarantee a particular in-room bass result.
What the facts say
What the comparison shows
Useful conclusions from the current AV receivers comparison, followed by the checked facts used to reach them.
Compared set
Only 1 of 34 models checked match every need here: “Build a 7.1.4 room”, “Start with Dirac room correction included”, and “Adjust multiple subwoofers separately”.
1 matching model from 34 checkedSee the checked facts and calculation notes
Match countThe count uses the current product-to-need assignments for “Build a 7.1.4 room”, “Start with Dirac room correction included”, and “Adjust multiple subwoofers separately”. A need with no documented match does not count.
| Product | Needs matched | Checked facts | Source records |
|---|---|---|---|
| Denon AVR-X3900H |
|
|
|
| Onkyo TX-RZ50 |
|
|
|
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.
Denon AVR-X3900H
Each subwoofer needs separate receiver adjustment
See price & reviews on AmazonOnkyo TX-RZ50
Full-bandwidth Dirac should be included
See price & reviews on AmazonLinks open in a new tab.