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Spotlight: Engineering Caspian Series 4G

27th January 2026

Posted in: Company News and Events | Product News

We sit down with Software Test Manager Joe Deller to discuss his input in the creation of Caspian Series 4G and what makes them so special.

 

 

 

Please introduce yourself and your role at Monitor Audio.

I’m Joe Deller, Software Test Manager.

 

What was your role in the development of the Roksan Caspian Series 4G, especially the Pre and Power?

Making sure you can get set up quickly, press play and hear music - smoothly, reliably.

I work with our MaestroUnite mobile app, device firmware and hardware interaction, as well as end-of-line testing. These have different approaches and levels of intensity; there is the occasional letting out of the magic smoke. I’ve broken a few test jigs along the way, ElectroBoom style.

The new models are all about flexibility—expanding existing setups or mixing with other brands. We test a wide mix of active speakers, valve amps, studio interfaces, analogue sources, digital, balanced, unbalanced, multi-speaker configurations, and combinations a customer might want. The software should get you to the configuration you want as smoothly as possible. During the power amp development, the relay count grew as we tried different configurations and refined the overall experience. The software can push the capabilities of the hardware, and vice versa; we’re always looking to see what new options can be offered.

 

 

How did you approach testing the MaestroUnite app and its integration with the hardware?

Originally, MaestroUnite was a "set up this device." Now it's "build me this system with multiple devices." There’s a huge matrix of possibilities, so we focus on the combinations most customers actually want.

We map out scenarios for different setups—where you might need guidance, where things might not work as expected, and how to keep your speakers safe from pops and clicks.

We have Caspians playing all day in the office, and employees volunteer their home systems for beta testing. We have distributors beta testing the mobile app. Real-world feedback from active users.

 

What makes the hybrid volume control system unique from a software perspective?

It gives you app control without sacrificing analogue smoothness or feel. No digital stepping, no matter whether you're turning the knob or adjusting from BluOS or your phone. The haptic feedback when you hit the end stops gives an analogue feel, even on an endless encoder.

 

 

How do you ensure seamless performance with BluOS and Roon?

Listening. Lots of listening. Hours of mixed formats, random playlists, many streaming platforms—using the gear as customers do. Pause, mute, switch sources, power cycle, repeat. For days.

Roon's certification demands extended multi-device playback with perfect sync. We don't submit units to Roon Labs until we're confident they'll pass. Same with BluOS—close collaboration, beta testing both ways, and nothing ships until we're both satisfied.

Most beta updates are smooth. Occasionally, we'll find an edge case—a specific playlist mix or network glitch that's rare in the office but can happen with home Wi-Fi. That's what we're hunting for, anything that stops music playing.

 

What's one feature you're most proud of in the Caspian 4G software experience?

The interface gets out of the way. Minimal, responsive, no fuss—it just delivers the music. We had lots of real-world feedback during development, and the firmware absorbed every change without complaint. That's the goal: technology that disappears.

 

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