The catch
Onkyo TX-RZ70
With two independent sub outputs, direct control on the receiver is limited for a larger sub setup.
Side by side
Onkyo TX-RZ70 vs Denon AVR-X4800H compared: Onkyo needs no extra amp, Denon manages four independent subs
Quick verdict
RZ70 is the choice for 7.1.4 from a single box with full-bandwidth Dirac included and one or two independent subs. X4800H cannot do 7.1.4 without an external stereo amp, although it brings seven rear high-refresh HDMI inputs and four independent sub outputs. Denon is the right call when you already have that amplifier, or when the extra sub and source connections fit the room you are planning.
Before you buy
Why, and what it costs you
An amp already on the shelf can undo the advantage of one box
In a fresh 7.1.4 build, RZ70 has the eleven amps built in, while X4800H needs a stereo power amp. If a suitable amp already powers the front speakers and has a proper place to sit, Denon can reuse it. In that case the extra sub and source connections count for more than the raw internal amp count. If you have to buy the amp and squeeze it into an unsuitable space, the supposed receiver bargain tells only part of the story. Compare real equipment and offers. The receiver price alone is not enough.
Where this comes from
Eleven requested channels set against nine and eleven internal amps, matched against what is owned and the limits of installation.
The catch
Denon AVR-X4800H
Nine internal amps mean 7.1.4 calls for additional stereo power. Dirac is an optional extra.
Onkyo TX-RZ70
- Why pick it
- Your 7.1.4 system is a fresh start with no external amp, and you want all eleven amplifiers inside one receiver.
- Supported front HDMI access or included Dirac is important to you.
- The catch
- With two independent sub outputs, direct control on the receiver is limited for a larger sub setup.
Denon AVR-X4800H
- Why pick it
- Your existing stereo power amp is suitable, and you have three or four subs that each need their own settings.
- Seven high-refresh sources stay connected permanently and need rear inputs.
- The catch
- Nine internal amps mean 7.1.4 calls for additional stereo power. Dirac is an optional extra.
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What this page compares
Onkyo RZ70 or Denon X4800H: which suits a new 7.1.4 theater, or a room that reuses an amplifier? Compare independent subs, source placement and whole-system cost.
Each processes eleven main speakers and suits similar home-theater builds. Whether you already own a suitable external amp can flip which purchase is more practical.
Which one fits
Pick the situations that sound like you
A new 7.1.4 system that needs no external power amp
Eleven internal main amps are in Onkyo.
- Onkyo TX-RZ70
- Better fit
- Denon AVR-X4800H
- Caution
A stereo amp you already have, and three or four subs each adjusted independently
The amp gets reused with Denon, which also offers four independent outputs.
- Onkyo TX-RZ70
- Caution
- Denon AVR-X4800H
- Better fit
A seventh high-refresh player kept connected
The seventh input on Denon can handle high-refresh.
- Onkyo TX-RZ70
- Caution
- Denon AVR-X4800H
- Better fit
A compatible guest source plugged in at the front
Onkyo’s front AUX comes with format limitations.
- Onkyo TX-RZ70
- Better fit
- Denon AVR-X4800H
- Caution
In practice
Differences you will notice
An amp already on the shelf can undo the advantage of one box
In a fresh 7.1.4 build, RZ70 has the eleven amps built in, while X4800H needs a stereo power amp. If a suitable amp already powers the front speakers and has a proper place to sit, Denon can reuse it. In that case the extra sub and source connections count for more than the raw internal amp count. If you have to buy the amp and squeeze it into an unsuitable space, the supposed receiver bargain tells only part of the story. Compare real equipment and offers. The receiver price alone is not enough.
How we worked this out
Eleven requested channels set against nine and eleven internal amps, matched against what is owned and the limits of installation.
A third sub can’t get a receiver setting of its own from a splitter
A room planned around three or four powered subs can make use of the four independent outputs on X4800H, whereas RZ70 has two. Duplicating one feed may connect another sub, but it doesn’t add a third receiver level or distance control. External sub processing can change the decision, though it brings more equipment and setup. With one or two subs, unused Denon outputs on their own establish neither a benefit nor a better acoustic result.
How we worked this out
The independent settings you want, compared with the physical outputs that can be adjusted independently. Distributing a signal and optimizing acoustics are separate matters.
The last HDMI socket can do two very different jobs
On Denon, the seventh input is a high-refresh route at the rear for another compatible player that stays connected. On Onkyo, the seventh input is front AUX, which is easier for visitors but limited to 9 Gbps. At 4K60 it needs 8-bit YCbCr 4:2:0. A family with a full permanent gaming collection may lean toward Denon, while one with fewer permanent players and regular use of a supported laptop or camera may prefer the access on Onkyo. Count devices by role and format. The total of seven sockets tells you little.
How we worked this out
The exact placement and bandwidth of the seventh input, matched against permanent and guest use.
Plan your receiver connectionsLay out my system
Check a documented speaker layout against HDMI sources and external-amplifier plans.
Onkyo TX-RZ70
Handles your setup
Runs 5.1.2 on its own built-in amplifiers. Takes 3 HDMI devices, 1 of them at 4K/120Hz. Use the six rear inputs for 4K/120Hz. The front input has lower limits.
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
Onkyo, US black standalone receiver
TX-RZ70
Your 7.1.4 system is a fresh start with no external amp, and you want all eleven amplifiers inside one receiver.
- Best for
- Your 7.1.4 system is a fresh start with no external amp, and you want all eleven amplifiers inside one receiver.
Facts we checked
- Built-in main amps: Eleven
- Independent sub outputs: Two
- Seventh HDMI input: Front 9 Gbps AUX
- Main processing ceiling: Eleven channels
Option B
Denon, AVR-X4800H
AVR-X4800H
Your existing stereo power amp is suitable, and you have three or four subs that each need their own settings.
- Best for
- Your existing stereo power amp is suitable, and you have three or four subs that each need their own settings.
Facts we checked
- Built-in main amps: Nine
- Independent sub outputs: Four
- Seventh HDMI input: Rear high-refresh input
- Main processing ceiling: Eleven channels
Spec by spec
Where they really differ
| Spec | Onkyo TX-RZ70 | Denon AVR-X4800H | In practice |
|---|---|---|---|
| Built-in main amps | Eleven | Nine | For 7.1.4, Onkyo needs no separate main-room amp. |
| Independent sub outputs | Two | Four | More separate receiver settings are provided directly by Denon. |
| Seventh HDMI input | Front 9 Gbps AUX | Rear high-refresh input | Choose between easy access for supported guests and a fast permanent source. |
| Main processing ceiling | Eleven channels | Eleven channels | A thirteen-main-speaker system can’t be built on either. |
Trade-offs
What each pick costs you
With Onkyo TX-RZ70
- The front HDMI has lower bandwidth. Powered Zone 2 can take the surround-back pair away.
With Denon AVR-X4800H
- Audyssey XT32 comes included. Budget for Dirac only if it belongs to the setup workflow you’ve chosen.
Change of plan
When the answer changes
The priority is to avoid a separate main amplifier
Go with Onkyo TX-RZ70. All eleven amps are inside RZ70.
Amplification you already own makes more independent sub outputs worth having
Go with Denon AVR-X4800H. X4800H brings four sub settings and keeps eleven-channel processing.
Decision guide
Before you buy
Eleven main speakers without extra boxes is the goal, though several subs could call for more receiver controls than the one-box choice offers.
What this page can’t tell you
- Neither receiver has measured superiority in sound or correction. Each tops out at eleven main channels of processing.
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
| Product | Needs it meets | Facts we checked | Sources |
|---|---|---|---|
| Onkyo TX-RZ70 |
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| Denon AVR-X4800H |
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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.
Onkyo TX-RZ70
Your 7.1.4 system is a fresh start with no external amp, and you want all eleven amplifiers inside one receiver.
Supported front HDMI access or included Dirac is important to you.
See price & reviews on AmazonDenon AVR-X4800H
Your existing stereo power amp is suitable, and you have three or four subs that each need their own settings.
Seven high-refresh sources stay connected permanently and need rear inputs.
See price & reviews on AmazonEach link opens in a new tab.
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