UT REF 1 PLUS 2-way HIFI speaker kit (Samu saurama Design)

UT REF1 PLUS is a highly sophisticated 2-way speaker that reproduces music cleanly and with minimal distortion. The sound of REF1 PLUS is natural, pure, and it beautifully brings out all the nuances of the recording.

• 2-way speaker
• 10" SICA 10 SR 2,5 CP woofer
• SICA CD 95.44 N240 POLY  tweeter
• High-quality crossover components
• Impedance: 8 ohms
• Sensitivity: approx. 91dB
• Frequency response: 30 - 20,000Hz
• Crossover frequency: 1.2kHz
• Dimensions: 920 x 295 x 323mm
• Price per unit, so order 2 units for a stereo pair

From the Designer

"The original Ref1 served for a long time as AudioVideo.fi's reference speaker. Its purpose was to be neutral, uncolored, and more revealing than average—a speaker that can handle a lot of power and also poses a challenging load for amplifiers, thus differentiating their abilities.

Ref1 Plus starts from the same fundamental principles: Neutral, uncolored, and more revealing than average. The essential difference with the original is that the Plus model is significantly more sensitive and much easier to drive. Additionally, the new version is cleaner sounding and more pleasant in the midrange and treble. Thanks to its sensitivity of over 90 dB, Ref1 Plus works well with even low-powered amplifiers starting from about ten watts. As the impedance minimum is just under 7 ohms and nearly purely resistive at that minimum, the speaker pairs well with tube amplifiers too. This was a key design criterion.

I recommend a 70-liter enclosure tuned to 30 Hz. It can be placed near to walls, delivers a solid punch, and its bass extends to about 25 Hz in an open field, which practically means down to 20 Hz or below in denser listening rooms depending on the room's characteristics. Another option is to build Ref1 Plus speakers in small sealed enclosures that just fit the drivers and manage frequencies below 80 Hz with a subwoofer. This is an excellent solution for home theater front channels.

Sonically, Ref1 Plus differs from the original Ref1 in several areas. The most apparent advantages in the Ref1 Plus are a more pleasant upper midrange/lower treble character thanks to a horn more suitable for home use, and cleaner upper treble thanks to an excellent compression driver. The original Ref1 extended a few hertz lower in the bass, but noticing the difference would require a side-by-side comparison. And it's always important to remember that the measured or simulated lower frequency limit doesn't tell anything about the character of the bass. In Ref1 Plus, it is precise, rich in tone, yet convincingly powerful."

-Samu Saurama 5/2024

The kit includes all necessary parts except for wooden parts. This includes crossover components, screws, circuit board, terminals, cable, speakers...

The enclosure is designed to be optimal for sound quality, but you can experiment with other shapes and styles depending on the usage (sometimes appearance comes first). However, it's advisable to keep the internal volume and port dimensions the same. 

Price includes unlimited technical support via email!