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The LS3.5 is iFi's 3.0 reboot of the classic BBS LS3/5A which is still now, half a century after its launch still in high demand and revered. iFi has taken the design back to its basic underpinnings and then re-engineered the LS3.5 ground-up for the 21st century. From designing the drivers (not OEM) to the cabinet terminals, where they were dissatisfied, iFi manufactured their own. This is the iFi level of attention to detail. The Retro LS3.5 is in many ways a synthesis of the best of the BBC LS3/5A and dash of the Le Petite. They eliminated their respective drawbacks using the very latest technological advancements available. So think of the iFi LS3/5A as BBC LS3/5a+Le Petite with an injection of factor x.
• The iFi RETRO LS3.5 speaker was inspired by the legendry BBC LS3/5a speaker. In order to create the most open, natural and organic sound, iFi uses the latest technologies combined with natural materials, to create the LS3.5
• The wideband driver is custom-made to iFi's high specifications. It is made of the super-light coated natural paper for ultra-fast response and excellent efficiency
• The super tweeter employed is no ordinary tweeter neither, again it is custom-designed and is performing the job of a super-tweeter. It is made of transparent organic silk and horn-loaded, to create a coherent image with the wideband driver
• The cabinet utilized is an advanced multi-chamber P.G.A.H Voigt tuned enclosure with a low turbulence port to reduce port noise at high levels. This design enhanced the bass performance of the small speaker to a level seldom achieved before
• The cabinet is made from natural, sustainable bamboo. It is 3 times as strong and has the weight of a normal wood cabinet. The extra strength and light weight reduce cabinet coloration significantly to enable the LS3.5 to create a wide, open, yet accurate sound
• Each cabinet is tuned using tuning elements (sound bar and braces) from musical instrument manufacturing
• Time-aligned tweeter and wideband driver for a perfect sound field
• Advanced amino-plastic open cell acoustic foam for best bass performance and a clean midrange
• Maximum surface contact gold-plated copper speaker terminals
iFi's brand-new tweeter that is smooth as silk, literally
Silk is smooth, so why not make a tweeter from the ground-up using it at the core? The iFi 28mm tweeter is horn-loaded and uses a neodymium magnet. It is very much a 21st century product - that is, at the advanced edge of tweeter technology. The silk dome combines the lack of resonances at the top of the operating range (as found on metal domes) with excellent dynamics in band. The small neodymium magnet structure shifts cavity resonances outside the audible range. Being horn-loaded, it matches perfectly with the wideband driver to create a mammoth sound field.
The tweeter is used only at the very top end of the audible range; the whole range from 59Hz - 8kHz covering the fundamentals of all instruments except those with very low bass notes and all the formants (the tone forming harmonics of instruments) is covered by the wideband driver, without any electrical or mechanical crossover. This avoids any damage to the phase/impulse response for this critical range. The simple arrangement of the crossover for the tweeter (first order at appx. 10kHz acoustic crossover) and the tweeters waveguide, which insets it for time-alignment with the wideband driver further preserves phase/impulse response.
Ground-up paper cone wideband driver
Natural material for a natural sound. The paper cone 115mm wideband driver by iFi performs more akin to a full-range driver. In many ways the wideband driver is very traditional, both magnet and basket. Stamped steel baskets can dissipate energy much faster than cast ones. It harks back to the "golden era" of driver design in the 1970's. Modern finite element modeling and modern materials have improved the driver in many areas (especially efficiency and bandwidth) over classics like the KEF B-110 which was originally used in the LS3/5A. The wideband driver rolls off after 8kHz. And it reaches down to 59Hz (with correct placement).
Time-Aligned to perfection
The iFi LS3.5 has a coherency that is based upon the simple fact from the outset, the tweeter and driver are perfectly time-aligned. Simply put, this means if one was looking at a cross-section of the LS3.5, the acoustic center of the tweeter and the wideband driver as precisely vertically-aligned. This means sound waves from both units arrive at ear of the listener at the same time (as opposed to at different times). This is an oft overlooked weakness of many speakers, but not in the iFi LS3.5.
Multi-chamber Voigt design with tuned enclosure
There are two-chambers in one. The enclosure is maybe best considered a variant of multiple reflex, also, by breaking up the larger volume into two smaller different volume/size sections resonance frequencies are spread and tuned to higher frequencies, where the Amino-plastic open cell foam they use for damping has optimal absorption. The Acoustic Active Tuning with minimal damping drawn from the musical instrument manufacturing sector further assists with dissipating resonance frequencies higher - just think of the LS3.5 as a musical instrument. This is why the LS3.5 is a speaker that makes music.
Bamboo is best
Bamboo is a grass - hence it is a sustainable material and exceptionally environmentally friendly. It is 2x lighter and 3x stronger than wood. The aforementioned Voigt design coupled with the "stiff as steel" bamboo enclosure and the extra reinforcement by the division plus the acoustic tuning - all combined, makes for a remarkably low sonic signature of the box. This is critical as the use of the single paper driver needed for the wide bandwidth cannot be counted upon to block resonances from inside the box passing through the way a heavy and slower plastic cone is able to. Hence for environmental and sonic reasons, it made perfect sense to use it as a speaker cabinet material. The LS3.5 is 5x more costly to manufacture than standard MDF cabinets. A simple knuckle tap shows its complete lack of coloration - which is easily audible from the first note.
Advanced Amino-plastic open cell foam
For the very minimal internal damping duties, they scoured the world for the most advanced acoustic materials and settled on the Advanced Amino-plastic open cell foam material. The open-cell surface guarantees that sound waves are not reflected as an echo but can penetrate the cell structure unhindered. The sound energy is reduced in the cell structure, giving an excellent sound absorption capacity. From their listening tests the ability to ensure the deepest and cleanest bass along with a mid-range that is spell-binding placed it heads and shoulders above all others. Despite its much higher cost, they just had to have it in the LS3.5.
Binding posts that carry the signal unhindered
Leaving no stone unturned, they sourced a binding post that had the purest copper count, had the maximum surface area contact and had to be gold-plated for long-term enjoyment. Rest assured that even the banana speaker connectors they developed from the ground-up! The silver-plated copper speaker cables and the gold-plated copper speaker connectors means the sound quality is simply unbeatable and means the LS3/5A can play with the "big boys".
Ground-up 28mm silk dome tweeter
Treble that is literally, smooth as silk.
Proprietary iFi 115mm paper cone wideband driver
Mid-range and bass that leaves the listener in awe.
Advanced Amino-plastic acoustic foam
The open cell structure is unmatched for sound absorption.
Maximum surface contact copper/gold-plated binding posts
As close to "no post" as it gets.
Sonics & Sustainability
2x lighter and 3x stronger. Bamboo = best.
Active Acoustic Technology inside and out
Transmission line port + Amino-plastic acoustic foam.
Proprietary is peerless: silk tweeter and paper driver
Developed in house for iFi, for iFi.
Time aligned tweeter and wideband driver
Coherent to perfection.