Listening with Leo's switch tuning 'ON', if I were to describe it in one sentence - very coherent, natural, musical tuning with top tier technicalities in the best possible way. If you are looking for a top tier all-rounder, look no further than the Pentara. With the amount of drivers and crossovers, it is impressive to achieve such technical details and tuning at a truly flagship level. Buy with confidence if this is what you look for
Pronounced and very high quality, tight, punchy, textured, controlled bass. Mids with enough warmth, emotion, note weight. Never thin or analyctical. Treble that provides clarity, detail, and air without sharpness and fatigue for me. Very deep and wide soundstage that expands like a sphere. Excellent resolution and imaging. No congestion. I do not have issues with anything in the frequency range that I can fault personally like I do with other IEMs. Everything just sounds right. Nothing sounds artificial or weird. Not recommended for bassheads seeking for more bass but rather for those that want neutral-warm leaning sound with pronounced and elevated bass.
UM's tuning switch '1' leans slightly less bass quantity, more clarity, and opens up the soundstage a little bit
Two different tunings that are noticeably different but useful from each other rather than being inferior. Easy to use the switches that compliment each other with tacticle sound
90% of the time I will prefer the switch on with Leo's tuning because it invokes a lot more emotion and dynamics with the elevated bass and warmth in the mids. Just my preference
Fairly easy to drive but scales with power or better DAC/AMP
Only major gripe I have is that the stock cable sucks tbh. Not ergonomic, heavy, stiff, minor microphonics, emits a minor sinewave hiss with my DAP as a USB DAC which I do not have with other cables. Recommend using a better cable up to user's choice
I notice that the treble does get a little spicy with poorly mastered songs with elevated treble though that is fairly rare
Lack of accessories and unboxing experience is not a big deal if you are ultimately chasing the sound anyway
As a self-proclaimed Astell fan and current owner of an SP3K, I hesitated quite a bit before upgrading to the SP4K, wondering if it was a halfway point (like an SP3.5K). I also wasn't particularly interested in an open-source Android system. Fortunately, I decided to take the plunge. The SP4K has turned out to be a complete surprise, to the point that it's the best DAP I've ever heard in terms of sound quality. A huge soundstage, bass with a texture I've never experienced before, and an astonishing level of detail. A total success.
These punch way above their price point. Very good bass for ba drivers that doesn’t make me miss dynamic drivers. Great technical performance, extended treble but not harsh. Love this set!
The hifiman arya organic is a great deal right now. Excellent overall hps that will impress anyone. Great punchy bass, beautiful mid-range with no sharp edges, very smooth. Someone said that it is bright? I don't find them to be bright at all. Powering with the hifiman prelude balanced mode using chord hugo tt2 as a dac. Just remembered that when I connected to a dap it sounded a bit thin for my liking. I will not be using with a dap. I compared with the hifiman he1000se and it not sounded as good as the he1000se, but for the money it's a no brainer.
I bought the original R6 mark 3 soon after it came out, and a few months later I bought another on sale because I liked the first so much I wanted a spare in case the first got lost, damaged, or stolen. So obviously I’m a big fan. Why? To me it’s the perfect mid-size mid-price mid-fi DAP. The form factor is ideal, it fits my hand perfectly, it’s not too heavy while still providing long battery life, the screen could be brighter but is extremely legible and sharp, Hiby players are all loaded with bonus features like MSEB and PEQ, and the sound is rich, accurate, and dynamic. The latest model improves on all this with new DAC chips, a more open sound, more memory, slightly better battery life but the same solid construction and excellent Android experience, all for less money. What’s not to like?
I had gone through maybe 5 different DAPs before this. None of them seemed like a good enough of an upgrade over my trusty M3 Ultra. This absolutely is. Perfect build quality and the official case fits perfectly. Sound is great, and powerful enough for my DCA E3s.
Thieaudio Monarch MKIV allows for two differing tunings, both excellent, making this like buying two high-end IEMs. This is one of my best purchases yet from MusicTeck.
Sometimes at stratospheric pricing comes esoteric tuning that truly make you wonder if it's about the music anymore. Pentara is not one of those head-scratchers.
Happy to report that these are some of the best IEM's the world has to offer when valuing musical engagement, Bass Quality, Texture and Tonality. Has nice wide stage with great imaging, treble is snappy and bite-y, but remain effortlessly rendered with realistic voicing.
Never shouty since midrange is more on the rich/ dense site of things.
More of a departure from the Mentor Multiverse than expected, but playing at a higher plane of fidelity.
Hi-Fidelity done right.
Love this cayin c9ii, it gives my hiby r8 ii a different presentation of sound and also warms it up, also increases soundstage and makes vocals so sweet and emotional! Definitely recommend!
Is so practical and good had to have 2 😁
The overall tuning feels flawless to me. The soundstage is very 3D with impressive width and height. Mid-bass has satisfying slam, and the sub-bass is the star of the show: textured, detailed, and full of rumble. The mids are lush and smooth with slightly forward vocals that never overshadow other details. Both low and upper mids carry enough weight to keep vocals sounding full-bodied.
Treble is airy, well-extended, and detailed without being fatiguing or overly bright.
Huge thanks to Leo and Andrew for the work they put into this set—it truly stands out.
I still remember the first time I heard Canpur 622b and was completely smitten with the intoxicating mid’s and sparkly but dry treble. The bass had nice texture but was a bit lackluster, a bit too rounded and lacking extension. The mid’s stole the show and at this time I was very focused on engaging mid’s and warmth over all else. Since then, my tastes have evolved and the first few minutes of listening to Canpur’s latest flagship the 752b I knew I was going to fall hard for its sound as it hits very very close to my current preferred taste. Engaging, clear, hint of warmth, extended and resolving treble, spacious and resolving mid’s with a supportive deep hitting bass. My only negative is the lack of DD bass timbre, decay and slam.
The Canpur is insanely detailed and technical. It literally just pours out information in the most liquid way possible. No shout, no fatigue. A huge open stage with notes that seem to float around you. The tonality is a bit more dry than textured throughout the FR but not to its dismay, it works for the tuning very well. To quote @aaf evo “Ugh I love 752B. Idc if this sounds like 3 year old water it’s the tastiest stale water of my life” I love this statement because…well…its funny but more so because it so accurately describes how I also vibe with the 752b. Or another way of saying it in more romantics terms, is that 752b is luxuriously refined. It works very well as an all rounder for me.
Bass is not the star of the show here but it also does not take a back seat. The bass is very satisfying, deep and rumbles nicely when called upon. Although you will not feel the push of air like that of a Dynamic Driver or hear an earthy timbre. It does still fill the head with nice reverb that is not distracting.
Mids are naturally distanced with plenty of space around each instrument/voice. Imaging and layering is spectacular here and nothing ever feels even the slightest congested or smeared. The stage is quite spherical, to my ear equidistant in all directions out of the head. Notes are not dense but more dry, light with super sharp transients from edge to edge of notes. Notes seem to float instead of feeling anchored. They float in there correct places with great stage structure. My only teeny complaint is the timbre of vocals and acoustic guitar can sound a bit thin at times. It’s not a deal breaker as it’s not to the point of being annoying. However it is how I hear it.
Treble is very resolving, layered and extended. There is a very occasional peak but for whatever reason it doesn’t come across fatiguing or piercing, to my ear I hear it like a very pronounced sparkle. The treble isn’t as dry sounding as it was on 622b and it is much better extended than that set as well. It still has a dryness to it but also a nice thick outline to the notes with defined edges.
The Dynamic range is also wonderful. Macro and micro dynamics swing with ease and shift in accordance to the music playing. Every nuance is heard. Imaging reached 3D holographic levels. This is true Summit techs. It is extremely immersive and even at low listening volumes nothing is compromised. 752b is so easy to drive as well. I used both the Quloos MUB5 and Ibasso Dx340Ti, both work very well for 752b. The 340Ti having better treble res while MUB5 offered a slightly richer tonality.
The 752b has really taken me by surprise, I held off on purchasing it for awhile as I thought it would bore me or become too much over long listening sessions but both could not be further from the truth! It has truly captivated me and is in good complementary rotation. Going to Fulgrim from 752b reminds me why I love the Fulgrim and going to the Asteria from 752b again reminds me why I love the Asteria and vice versa going from each of those to 752b reminds me why I bought the 752b and have fallen hard for its sound
Sounds great on iems and headphones. I find this pairs well with extremely low impedance iems, especially for bassheads.
The A&O Omega is a beautiful piece of art. The design, the premium drivers, the cable…all top notch. In today’s day and age, an IEM this special under $3k is significant. Before I get too far into this, it is best to throw a neutral/natural source at the Omega. Something overly warm will leave you missing the higher-end technicalities that it can produce. While it doesn’t HAVE to have a lot of power, something that gives plenty of headroom will benefit the Omega, and your listening enjoyment. Basically, just remember that synergy is king…doesn’t always have to be the most expensive source kit to get the most out of a higher end IEM.
The tonality is full, with a warm tilt. I hear no edginess or sibilance regardless of where the switches are. The bass is just spectacular. If you, like me, had a romantic inclination towards something like the Legend X (or Evo), this is a wonderful upgrade from that general category of sound signature. It evokes the same emotion to me as the X did back in the day. I’ve had the chance to trade with friends a couple of times and just can’t imagine enjoying anything more without breaking my bank with the Fulgrim. Don’t hesitate to give the Omega a try.
When the jack stopped working on my wm1a I wanted something small but still with natural musical timbre. I had the W4, which was very resolving and great in its own way. I decided to try the ru7. I think it's great and has the kind of sound I was looking for. It really is a kind of synthesis in sound between the w4 and wm1a.
The Canpur CP752B is nothing short of a revelation in the "summit-fi" landscape, effectively redefining what a flagship multiverse-driver IEM can do. The first thing that grabs you is the sheer scale of the soundstage—it is genuinely holographic. Where other IEMs might give you width, the CP752B uses its dual bone conduction drivers to create a 3D bubble that feels less like listening to earphones and more like sitting in a properly treated listening room. The separation is surgical without being sterile; you can pick out every layer of a complex track, yet the drivers—despite being a mix of BA, EST, Planar, and BC—blend with a coherence that is almost impossible to find in other "quadbrid" sets.
Tonally, these strike a brilliant balance that many are calling a refined "W-shape," bringing the best of all worlds. The bass is authoritative and massive, providing that visceral, textured rumble you usually only get from dynamic drivers, yet it retains the lightning-fast speed of balanced armatures. It hits with a weight that provides a solid foundation for the music without bleeding into the mids. Vocals are pushed forward just enough to be intimate and engaging, avoiding that distant "scooped" feeling, while the treble offers that elusive "sparkle without pain"—delivering immense air and micro-detail that extends forever without ever becoming sharp or fatiguing.
Finally, the build and package cement its status as an endgame monitor. The medical-grade resin shells are surprisingly comfortable for the driver count, and the collaboration with Eletech for the stock cable shows Canpur didn’t cut any corners. It is rare to find an IEM that manages to be both a technical monster and musically "fun" at the same time, but the CP752B pulls it off effortlessly. If you are looking for an IEM that competes with (and often wallops) sets costing significantly more, this is absolutely the one to beat.
The Epitome of the "Sophisticated Basshead" Monitor
Sound Signature Overview The Alpha & Omega Fulgrim can be best described as a "sophisticated basshead" audiophile monitor. It offers a masterclass in dynamic control, distinguishing itself by knowing exactly when to exhibit restraint and when to unleash power. Unlike typical bass-heavy IEMs that apply a blanket boost across the spectrum, the Fulgrim respects the mix; if a track demands neutrality, the low end remains disciplined. However, when the composition calls for it, the bass response is authoritative, visceral, and commanding.
Frequency Response Breakdown
Bass (The Foundation): With the stock Aura cable, the tuning exhibits a distinct bias toward the sub-bass region. The quality here is exceptional—highly textured, detailed, and deeply impactful. Crucially, despite the sheer quantity of low-end energy available, the tuning is meticulous; the bass creates a solid floor without ever bleeding into or muddying the lower mid-range.
Mid-Range (The Vocal Presence): Because of the clean separation from the bass, the mids are left uncolored and pristine. Vocals, both male and female, are rendered with clarity and high-resolution detail, ensuring the emotional core of the music is never lost behind the low-end drive.
Treble (The Resolution): The top end is characterized by excellent extension and a palpable sense of "air." Utilizing a configuration of 6 Electrostatic (EST) drivers, the Fulgrim achieves a transient response that is both resolving and authoritative. This technical capability ensures that no matter how thunderous the bass becomes, the treble remains distinct, piercing through the mix to reveal micro-details and atmospheric cues.
Technical Performance & Separation One of the Fulgrim’s standout technical achievements is its frequency separation. The three primary zones—Bass, Mids, and Treble—operate in distinct layers. There is no incoherent overlap or masking; the listener receives a holographic presentation where powerful lows and sparkling highs coexist without competing for acoustic space.
Synergy & Cable Pairing While the stock configuration provides a thrilling ride, those with a sensitivity to high-frequency energy may find the treble energetic. For these listeners, I strongly recommend pairing the Fulgrim with the Astral Acoustics "Luna" upgrade cable. This pairing introduces a subtle warmth that smooths out the sharper edges of the treble response while maintaining the IEM's inherent resolving capabilities, offering a more organic listen without sacrificing detail.
Verdict The Alpha & Omega Fulgrim is a rare beast: a monitor capable of satisfying the cravings of a basshead while maintaining the technical prowess required by a critical listener. Its ability to handle 99% of music genres with agility makes it a versatile endgame solution for those who want power without compromising on clarity.
The rumble in the bass when the bone conduction works properly and the holographic soundstage... I got spooked when I heard a bird chirping behind me and turned back only to find out it was from the song.
Pros:
Truly immersive, spherical soundstage that wraps around you
Exceptionally controlled, addictive bass
Two genuinely useful tuning switches
Can listen for hours without fatigue or discomfort
Outstanding technical performance (imaging, staging, resolution)
Cons:
Bass quantity won't satisfy those seeking maximum rumble
Sources
iBasso D17 (OS/L, AMP/L, Line Out, Volume 95)
Luxury & Precision EA4 (amplifier)
Summary
For context on where I'm coming from: my main priorities are soundstage, imaging, and layered bass—not boosted, just well-textured and controlled. I'm not chasing maximum slam or the most forward vocals. I want to feel like I'm inside the music.
The Pentara checked every box. It's replaced my FiR Audio Radon 6 as my daily driver and effectively retired both my Symphonium Crimson and Unique Melody Asahi. I just don't reach for them anymore.
Sound Signature & Comparisons
vs. FiR Audio Radon 6 (Previous Daily Driver)
The RN6 was my daily for a reason—that Kinetic Bass hits deep, and the soundstage is genuinely wide. But I always felt like the staging was a bit egg-shaped. Plenty of width, not as much depth or height.
The Pentara fixes this. It's the first IEM where I feel like the music actually surrounds me rather than just stretching left to right. The bass doesn't slam as hard as the RN6's Kinetic Bass, but honestly? I don't miss it. The Pentara's low end is so well-controlled and textured that it's become addictive in its own way. Throw on Yosi Horikawa's Fluid and you'll hear what I mean—there's real nuance down there.
vs. Symphonium Audio Crimson
Look, the Crimson is a fantastic value. Fun signature, punches way above its price. But I could never wear it for more than an hour or two before needing a break—partly fatigue, partly comfort.
With the Pentara, that problem doesn't exist. I can keep these in indefinitely. And beyond just comfort, the technical gap is real. Staging, imaging, overall presentation—it's a different league. I haven't touched the Crimson since getting the Pentara.
vs. Unique Melody Asahi
This one's straightforward. I only ever used the Asahi when I wanted something more mid-focused. The Pentara's Switch 1 gives me basically the same thing, so the Asahi became redundant overnight.
I keep the switch set to On most of the time for the extra bass and dynamics. When I'm in the mood for acapella or vocal-heavy tracks, I flip to Switch 1. Works perfectly. The Asahi now belongs to a friend.
Verdict
The Pentara turned out to be exactly what I wanted: the immersive staging the RN6 was missing, the technical chops the Crimson couldn't deliver, and enough versatility to make the Asahi unnecessary. If your priorities line up with mine—soundstage, imaging, textured bass—this one's worth a serious listen.
My first venture into high-quality headphones....in search of an "intimate sound stage" ....Research and assessment of reviews paid off. These place you center-stage...I'm in the band !
Satisfied customer !
First of all, the transaction and communication with Musicteck were absolutely top-notch. Constant updates, clear explanations, real help, an irresistible offer, and shipping to Europe in under five days with no suprise extra charges.
Second: the earphone. I own several full-size headphones across different price ranges, and plenty of IEMs. I even have the MEST MKII second-hand.
This one is special. It has a more mature tuning than its predecessors. It won’t give you an immediate “WOW,” but if you have good music with you, this earphone becomes wonderful when paired with a solid DAP.
Luckily, I have the DX340 with AMP16, and I’m using the Effect Audio Eros II as the cable partner.
It’s correctly incorrect—maybe sitting right in the middle thanks to that soundstage—slightly bright, holographic, and with flawless timbre.
To sum it up: the sound is super-holographic, exciting, and genuinely unique. This also means it won’t be a safe bet for everyone, so I’d recommend borrowing or demoing it before you decide.
High quality like everything from pw audio. Works great and lets me use my 2 pin cables with my Annihilator 2023.