MoFi Electronics arrives at loudspeaker design with an unusual pedigree. The parent organization built its reputation on Mobile Fidelity Sound Lab, the mastering house famous for meticulous half-speed remasters and its obsession with fidelity to the original recording. When the company expanded into hardware, it recruited Andrew Jones, a loudspeaker engineer whose career spans some of the most respected concentric driver designs in the industry. The SourcePoint 888 is the floorstanding expression of Jones's philosophy for MoFi, and it distills decades of point-source thinking into a three-way tower aimed at the serious listener.
This is a deep technical read. We will go feature by feature, explain how each element works, and connect every design decision to what you actually hear in the room.
Driver Design and Acoustic Topology
What is a concentric driver and how does it work in the SourcePoint 888?
A concentric driver mounts the tweeter at the acoustic center of the midrange, so both radiate from the same point in space. In the SourcePoint 888, a 1.25 inch soft-dome tweeter sits at the middle of an 8 inch paper-cone midrange. The mechanical benefit is coincidence: the high frequencies and midrange frequencies originate from the same physical location, so they arrive at your ears time-aligned across the crossover region rather than from two separate spots on a baffle.
Why does this matter audibly? In a conventional design with a tweeter mounted above a separate midrange, the two drivers are physically offset. As you move your head or stand up, the path length from each driver changes at a different rate, which smears imaging and shifts tonal balance off-axis. A coincident source largely removes that problem. The midrange cone effectively acts as a waveguide for the tweeter, so the two drivers integrate with a consistent radiation pattern through the crossover. The practical payoff is a stable, precisely focused phantom image and a much larger usable listening window, both horizontally and vertically.
Why did MoFi use a soft-dome tweeter instead of a metal or hard dome?
A soft-dome tweeter uses a flexible fabric diaphragm that tends to break up in a gentle, self-damping way rather than ringing at a sharp resonant peak. The 1.25 inch soft dome here is larger than the typical 1 inch tweeter, which lets it move more air and reach lower into the crossover region comfortably. That larger diameter also helps it mate cleanly with the surrounding midrange cone as a waveguide.
The audible character of a well-implemented soft dome is smoothness and freedom from the metallic edge that can accompany hard-dome designs when their high-frequency resonance is not fully suppressed. Because the SourcePoint 888 is rated to reach up to 30kHz, the tweeter has genuine extension well past the audible band, which supports airy, extended treble and preserves the leading-edge detail of cymbals, bowed strings, and vocal sibilance without harshness.
Why use a paper-cone midrange in a modern loudspeaker?
Paper remains one of the best midrange cone materials because it offers a favorable ratio of stiffness to mass with excellent internal self-damping. The 8 inch paper cone in the SourcePoint 888 dissipates its own resonant energy quickly, so it does not store and re-release vibration as coloration. That self-damping is exactly what you want in the midrange, where the human ear is most sensitive to any resonant signature.
Using a full 8 inch cone for the midrange is a deliberate choice. A larger midrange radiator has more surface area, so it produces a given output level with less excursion. Lower excursion means lower distortion and a more relaxed, effortless presentation of voices and instruments through the critical middle of the band, where most musical energy lives.
How do the two 8 inch woofers contribute to the sound?
The two 8 inch woofers handle the low frequencies and give the SourcePoint 888 the cone area to move real air. Combining two dedicated woofers with the concentric mid-tweeter makes this a genuine three-way design, meaning the midrange never has to reproduce deep bass. Splitting those duties keeps the midrange cone free of the large excursions that generate intermodulation distortion, which preserves midrange clarity when the music gets loud and bass-heavy.
Two woofers also add radiating area that improves dynamic headroom and low-frequency authority. The rated frequency range extends down to 32Hz, which reaches the fundamental of the electric bass and most of the low end in orchestral and electronic material. Practically, that means the SourcePoint 888 can deliver weight and slam without requiring a subwoofer for the majority of program material.
Crossover, Enclosure, and Build
Why is this a three-way design rather than a two-way?
A three-way design splits the audible band into three regions, each handled by drivers optimized for that range: the woofers for bass, the paper cone for midrange, and the soft dome for treble. The SourcePoint 888 uses the concentric driver for the two upper bands and the pair of woofers for the lowest band. The advantage over a two-way is that no single driver is stretched across too wide a range.
In a two-way, the midwoofer must reproduce both midrange and bass, which forces compromises: large bass excursions modulate the midrange, and the cone must be sized as a compromise between bass output and high-frequency behavior. By dedicating the woofers to bass and the paper cone to midrange, the SourcePoint 888 keeps each driver operating in its comfort zone. The crossover then blends these regions, and because the mid and treble already share an acoustic center, the transition from midrange to treble is inherently better time-aligned than it would be with physically separated drivers.
How does the rear-ported enclosure work and what does it do for the bass?
A rear-ported enclosure uses a tuned vent, mounted on the back panel, to extend low-frequency output. The port and the enclosed air volume form a Helmholtz resonator that reinforces output near the tuning frequency, allowing the woofers to reach deeper with greater efficiency than a sealed box of the same size. This is how the SourcePoint 888 achieves its 32Hz low-end reach while maintaining a sensitivity of 87dB.
The rear-firing placement has practical implications for setup. Because the port exhausts toward the wall behind the speaker, wall proximity affects bass loading. Pulling the tower farther from the front wall tends to tighten and clarify the bass, while placing it closer reinforces low-frequency output. This gives you a useful tuning tool: you can dial in the balance of weight versus articulation simply by adjusting distance from the wall, so plan on leaving breathing room behind the speakers.
What does the cabinet construction contribute to performance?
The enclosure's job is to be acoustically inert so that only the drivers make sound, not the box. A floorstanding cabinet of this type is engineered to control panel resonance and to hold the drivers rigidly in place. Any energy that the walls of the cabinet radiate arrives slightly delayed and colors the sound, so a well-braced, well-damped enclosure keeps the presentation clean and lets the low-level detail from a good recording come through.
The floorstanding format itself serves the acoustics. It positions the concentric driver near seated ear height and provides the internal volume the two 8 inch woofers need to load properly and reach down to 32Hz. A tower also raises the drivers away from strong early floor reflections compared with a small stand-mount, which supports the clean imaging the concentric topology is designed to deliver.
Electrical Behavior and System Integration
Is the SourcePoint 888 active or passive, and what does that mean for you?
The SourcePoint 888 is a passive loudspeaker, which means it requires a separate amplifier. There is no built-in amplification or powered crossover inside the cabinet, so the crossover is a passive network fed by the full-range signal from your power amplifier. This is the traditional approach and it gives you complete freedom to pair the speaker with the electronics of your choice.
Being passive puts the amplifier match squarely in your hands. The upside is flexibility: you can voice the system through your choice of amplification, cabling, and source components. The responsibility is that the amplifier must be capable of driving the speaker's electrical load competently, which brings us to sensitivity and impedance.
What does 87dB sensitivity at 2.83V/1m tell you about amplifier needs?
Sensitivity of 87dB (2.83V/1m) means the speaker produces 87 decibels of output at one meter when fed a standard 2.83 volt input. This is a moderate sensitivity figure, neither notably high nor low. In practical terms, the SourcePoint 888 rewards an amplifier with real current delivery and comfortable headroom rather than a low-power design.
Why care about headroom? Music has transient peaks that draw far more power than the average level. An amplifier with ample reserves reproduces those peaks cleanly, so drums, dynamic swings, and orchestral crescendos hit without strain or compression. With a speaker of this sensitivity and a pair of 8 inch woofers to control, a robust, current-capable amplifier lets the design show its full dynamic range and grip on the bass.
What do the 6 ohm nominal and 4.5 ohm minimum impedance figures mean in practice?
Nominal impedance of 6 ohms describes the speaker's average electrical load, while the 4.5 ohm minimum is the lowest the impedance dips as frequency varies. Impedance is not constant across the band; it rises and falls with frequency, and the amplifier must supply more current where the impedance drops. A 4.5 ohm minimum is a moderate dip that a competent amplifier stable into lower impedances will handle comfortably.
What should you take from this? Choose an amplifier that remains composed into a 4.5 ohm load and delivers current confidently. The relatively gentle minimum, combined with the 6 ohm nominal rating, means the SourcePoint 888 is not an especially punishing load, but it also is not a trivial one. Amplifiers that maintain their output and control as impedance falls will deliver the tightest bass and the most stable imaging.
How should you position and integrate the SourcePoint 888 in a room?
Because the concentric driver radiates from a single acoustic center, the SourcePoint 888 is forgiving of listener position but still benefits from careful aim. Start with a modest toe-in so the tweeters point toward or just outside your shoulders, then fine-tune by ear. The coincident source means the tonal balance stays consistent as you move, so you have latitude to optimize for imaging and stage width.
Given the rear port, allow space behind the speakers and treat wall distance as your primary bass-tuning control. For system integration, feed the SourcePoint 888 from a stable, current-capable amplifier and a clean source, and let the concentric topology and three-way structure do their work. The frequency range up to 30kHz means the speaker will resolve everything a high-resolution source presents, so the quality of your front end will be clearly audible.
Where the SourcePoint 888 Sits in the MoFi Electronics Lineup
How does the SourcePoint 888 fit within the MoFi Electronics range?
The SourcePoint 888 represents the floorstanding embodiment of MoFi Electronics' SourcePoint concentric philosophy, scaling the point-source concept into a full three-way tower. Where the smaller SourcePoint models express the coincident-driver approach in stand-mount form, the 888 adds two dedicated 8 inch woofers and a floorstanding cabinet to deliver full-range performance from a single pair of speakers.
Within the MoFi ecosystem, this speaker pairs naturally with the brand's broader mission of fidelity to the recording. Andrew Jones's concentric engineering gives it the imaging precision and off-axis consistency that MoFi's mastering heritage prizes, while the three-way architecture provides the low-frequency extension and dynamic ease that a serious listening room demands. For the enthusiast who wants coherent, point-source imaging with genuine bass authority in one cabinet, the SourcePoint 888 is the tower that puts the whole design philosophy on full display.