Protocol Max | Portable DAC-Amplifier with 10-Band PEQ, Dual Cirrus Logic CS43198 + Dual SG Micro SGM8262-2 | 600mW High Power Amplification
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AI Verdict
This 3.88-ounce portable DAC-amp with dual CS43198 DACs and 600mW balanced output is for driving demanding headphones with persistent 10-band PEQ.
This DAC-amp offers desktop-class power (600mW balanced) and persistent PEQ in a portable 3.88-ounce form factor, which is compelling for specific use cases. However, its reliance on a PC for EQ profile changes and reported linear volume control on some mobile operating systems limit its flexibility for others.
If on-the-go EQ adjustments are critical, look for a portable DAC/amp with a dedicated companion app or physical on-device controls.
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Pros
- Delivers up to 600mW of output power via its 4.4mm balanced connection, capable of driving demanding headphones.
- Features a persistent 10-band parametric EQ that saves custom sound profiles directly to the device.
- Equipped with dual Cirrus Logic CS43198 DAC chips for digital-to-analog conversion.
- Offers low output impedance (<0.6ฮฉ balanced, <0.3ฮฉ single-ended) for compatibility with sensitive IEMs.
- Housed in a compact aluminum chassis and weighs 3.88 ounces, making it portable.
Cons
- EQ profile management requires connecting to a PC/Mac with a browser, without on-device switching.
- Volume control on iOS/macOS can exhibit a linear curve, making fine adjustments difficult.
- Some users have reported insufficient power from the 3.5mm single-ended output for certain headphones.
- Lacks an internal battery, relying on the host device for power.
Dimension Scores
Dual Cirrus Logic CS43198 DACs and dual SG Micro SGM8262-2 op-amps are designed for transparent and neutral sound with minimal distortion.
Delivers up to 600mW via 4.4mm balanced output, capable of driving demanding headphones, and offers a Boost mode for maximum power.
Features both 4.4mm balanced and 3.5mm single-ended outputs, plus USB-C and USB-A connectivity, but lacks Bluetooth or other wireless options.
Housed in sleek aluminum and weighing 3.88 ounces, it is compact and durable for travel, though one user noted a minor cosmetic flaw.
Best For
- Audiophiles who want to apply custom EQ profiles that persist across different source devices.
- Users with demanding full-size headphones requiring up to 600mW balanced power on the go.
- Listeners who use sensitive IEMs and need a DAC-amp with low output impedance.
- Individuals seeking a compact, USB-powered DAC-amp for both desktop and mobile use.
Not Recommended For
- Users who need to switch or deactivate EQ profiles frequently without access to a computer.
- Those prioritizing maximum power delivery specifically from a 3.5mm single-ended connection.
- Anyone needing a portable DAC/amp with an internal battery for standalone operation.
Watch Out For
- The volume curve on iOS/macOS can be linear, making precise adjustments challenging for some users.
- Switching or deactivating saved EQ profiles requires connecting the device to a PC or Mac running a Chrome browser.
- Some users have experienced the 3.5mm single-ended output providing insufficient power for their headphones, even in Boost mode.
- One user noted a cosmetic flaw with visible glue residue on the device's window.
Full Specifications
| ASIN | B0FSRT288B |
| Brand | CrinEar |
| Color | Black |
| Style | Portable |
| Units | 1.0 Count |
| Material | Aluminum |
| Impedance | 0.2 Ohms |
| Model Name | Protocol Max |
| Form Factor | Portable DAC-Amplifier |
| Item Weight | 3.88 ounces |
| Control Type | Button Control |
| Manufacturer | CrinEar |
| Cable Feature | Detachable |
| Ear Placement | Open Ear |
| Noise Control | None |
| Control Method | Push Button |
| Earpiece Shape | over_ear |
| Headphones Jack | 4.4mm Balanced, 3.5mm Single-ended |
| Number of Items | 1 |
| Special Feature | Adjustable and Persistent Parametric EQ, Dual Cirrus Logic CS43198 DAC Chips, Dual Power Modes, Dual SG Micro SGM8262-2 Operational Amplifiers, Sleek Aluminium Housing |
| Audio Driver Type | Hybrid Driver |
| Item model number | DK55 |
| Compatible Devices | Android, Windows, iOS (USB-C), macOS |
| Frequency Response | 384 KHz |
| Package Dimensions | 4.13 x 4.09 x 1.54 inches |
| Included Components | DAC-Amplifier, USB C-to-A Adapter, USB C-to-C Cable, User Manual |
| Input Device Interface | USB-C |
| Water Resistance Level | Not Water Resistant |
| Age Range (Description) | Adult |
| Connectivity Technology | USB-A, USB-C |
| Specific Uses For Product | Audio Playback, Digital-to-Analog Conversion, Professional Audio |
| Recommended Uses For Product | Audio Playback, Music Production, Professional Audio |
| Supports Bluetooth Technology | No |
What Buyers Say
The CrinEar Protocol Max is a compact DAC-amp that packs a punch, especially with its 600mW balanced output and persistent 10-band PEQ, which is a big deal for customizing sound profiles that stick with the device. However, managing those EQ profiles is tied to a PC, which is a real bummer if you're trying to tweak things on the fly with your phone. Some users have also pointed out that the volume control can feel pretty coarse on Apple devices, and the 3.5mm output might not always deliver the power you expect.
โHonestly, the 600mW balanced output is insane for this size, but having to plug into my laptop just to change an EQ profile is a pain, especially when I'm out and about with different IEMs.โ
Common Praise
- The 600mW balanced output effectively drives power-hungry headphones.
- Browser-based PEQ allows custom sound profiles to be saved directly to the device.
- Clean and transparent sound reproduction from the dual DACs.
- The compact aluminum build feels durable and is easy to carry.
- Low output impedance works well with sensitive in-ear monitors.
Common Complaints
- EQ profiles cannot be switched or deactivated without a PC/Mac connection.
- Volume control can be linear on iOS/macOS, making precise adjustments difficult.
- Some users found the 3.5mm single-ended output to be underpowered.
- No internal battery, relying on the host device for power.
- One user reported minor cosmetic issues like visible glue.
Ownership Tips
- The browser-based PEQ is powerful, but you'll need to plan your EQ changes ahead of time if you're not near a computer.
- The device gets its power from your phone or computer, so expect some battery drain on your source device.
- The physical size is genuinely pocketable, but the connected cable might add some bulk.
- If you primarily use 3.5mm, test its power with your specific headphones, as experiences vary.
Frequently Asked Questions
Does the Protocol Max have a battery?
No, the Protocol Max is a dongle DAC/amplifier and draws power directly from the connected source device via its USB connection.
How do I change EQ profiles?
You use a browser-based tool (Hangout.Audio Graph Tool) on a PC or Mac to upload and save 10-band PEQ profiles directly to the device.
Can I switch EQ profiles on my phone?
No, switching or deactivating EQ profiles requires connecting the device to a PC or Mac with a Chrome browser.
Is it powerful enough for demanding headphones?
Yes, it delivers up to 600mW of power through its 4.4mm balanced output in Boost mode, which is sufficient for many demanding full-size headphones.
Does it work with iOS devices?
Yes, it is compatible with iOS devices, but some users report a linear volume curve that can make fine adjustments difficult.
Buying Guide
When looking at portable DAC-amps, you need to think about how much power your headphones actually need and if you want to tweak your sound. This device offers a lot of power and a unique way to customize your audio with EQ, but how you manage those settings is a key consideration for your daily use.
Max Power Output (600mW Balanced)
This number tells you how loud and how well the DAC-amp can drive your headphones. 600mW is a lot for a portable device, meaning it can make even power-hungry headphones sing without sounding weak.
10-Band Parametric EQ
A parametric EQ lets you fine-tune specific frequencies in your music, like adjusting bass or treble, to match your headphones or personal preference. Having it save to the device means your custom sound travels with you.
Dual Cirrus Logic CS43198 DACs
The DAC (Digital-to-Analog Converter) is what turns digital music files into analog sound your headphones can play. Dual, high-quality DACs often mean a cleaner, more detailed sound with less noise.
Alternatives
If you need on-the-go EQ profile switching or prefer an internal battery, look for portable DAC-amps with dedicated mobile apps or physical controls for EQ, and a specified battery life.
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