New This Month

C.O.S. Engineering D10V4 "SE" & FEZZ TITANIA MK2

With neither company prepare to rest on their success and awards COS and FEZZ have released new versions of key products in their portfolios.

Lets start with FEZZ TITANIA MK2 as there are some easily seen design changes.

Titania MK2 EVO Series

Titania MK2 is a refreshed tube amplifier engineered around a completely new circuit topology. The redesigned signal path, improved driver stage and carefully selected components deliver a more dynamic, transparent and refined sound. The new design combines energy, natural tonality and rich detail, creating a wide and immersive soundstage. Titania MK2 impresses with both control and

musicality, maintaining the warm, engaging character that tube enthusiasts love. The amplifier features a new remote control allowing volume adjustment, source selection and power management. A “standby” mode and optimised pre-heating cycle ensure ideal operating conditions and extend tube lifespan. An expansion slot for optional add-on modules is available, giving users the flexibility to enhance the amplifier’s functionality. The completely redesigned electronic tube protection system, together with automatic bias control and correction, guarantees

maximum reliability and truly maintenance-free operation. Titania MK2 brings together modern engineering, tube tradition and refined sonic performance an amplifier that brings music to life with clarity, dynamics and unmistakable tube magic.

Subtle changes in the look

A massive change in build & design

Specification:

Model: Titania MK2

Type: vacuum tube stereo integrated amplifier

Tubes: 4x KT88 + 3x 12AX7

Inputs: 3x RCA + 1x DIRECT

Equipment card slot extension: 2x

Suitable speaker impedance: 4 Ω / 8 Ω

Nominal output power: 60 W

Total harmonic distortion: <0,05%

Signal bandwidth (-3 dB): 16 Hz – 120 kHz

Damping factor: >40

Input impedance: 50 kΩ

Sensitivity: 0,7 V

Power consumption: 170 W (at idle); 270 W (at full power)

Options included: sub-out, remote control, tube cage

Weight: 21,5 kg

Dimensions: 420 x 380 x 200 mm

Colour schemes:

Standard Colour : SILVER in AUSTRALIA

Colours available to order as below : Production lead time 6 weeks - order to build

The C.O.S. D10 V4 "SE"

The Evolution of Excellence

Introducing the COS D10V4SE

Date: April 7, 2026

With so many audio products now being built with or an option to add later a streaming option, it was time to up the performance of one said module.

At COS Engineering, our quest for the perfect sound is never stationary. We are proud to announce the D10V4SE, a significant update to our acclaimed D10 series.

This version represents a comprehensive refinement of the analog and streaming architectures, designed to lower the noise floor further and bring your music to life with unprecedented authority and clarity.

The V4SE update introduces the following key enhancements:

1. Re-engineered Analog Architecture

We have completely overhauled the analog board to ensure the most pristine signal path possible:

• Precision Regulation: New analog linear regulators paired with a lower noise, higher bandwidth OP-Amp deliver a faster dynamic response and superior ripple rejection.

• Optimized Grounding: By meticulously tweaking the analog and digital ground planes, we have ensured that digital current interference is kept away from sensitive analog circuitry.

• Sonic Result: Listeners will notice a significantly lower noise floor and a more transparent, effortless presentation.

2. Enhanced Analog Power Supply

The heart of the D10’s musicality has been strengthened with a new, custom-designed transformer:

• High-Current Capacity: Featuring a larger core and thicker internal wiring, this transformer provides

higher output current with lower resistance.

• Sonic Result: This power reserve translates directly into the audible spectrum, where mid-band

richness and bass "grip" and extension are greatly improved.

3. A Purist’s Streaming Module

The V4 features a new, dedicated streaming module designed for the uncompromising audiophile:

• Purpose-Driven Design: We have removed the WiFi circuitry to eliminate a significant source of internal

RF noise and to provide optimized space for critical internal wiring and placement.

• Advanced Noise Management: The module now utilizes a spread-spectrum main regulator and a dedicated linear regulator for the Ethernet port.

• Sonic Result: A "blacker" background and a cleaner, more focused soundstage for all networked audio.

Why This Matters

The COS D10V4SE is not just a specification update; it is a testament to our belief that in high-end audio, the smallest details yield the greatest emotional impact. By removing distractions like WiFi and strengthening the analog foundation, the D10V4SE offers a purer connection to your music.

• For more information regarding availability or to schedule a demonstration, please contact us so we can guide you on timing as these are being built now.