Sound impressions
Grand Luna needs a bit of juice to really shine, with its relatively low 94dB sensitivity rating demanding more power than your average IEM. That said, a basic dongle should still power it sufficiently for on-the-go listening, and it will scale nicely with more powerful sources – something I discovered during my testing period.
Testing was conducted over two weeks using a variety of test tracks and new music releases across a number of different sources, including Sony’s classic WM1Z Walkman and HiBy’s R6 Pro II (2025 version, review coming soon), along with basic and more sophisticated dongles, including Campfire’s new Relay (review coming soon). All testing was done with the stock cable terminated in 4.4mm balanced unless otherwise stated.
Tonality
I hear Grand Luna as a sharply v-shaped IEM, with generously boosted and extended bass and relatively boosted treble, especially in the lower treble region. While some would call the midrange neutral, I feel it’s quite recessed, with a sizeable dip between 2KHz and 5KHz that distances female vocals and some male vocals, particularly on midbass-heavy tracks.
The flipside is a fun, engaging tuning that’s good to excellent with electronic and some instrumental music that doesn’t require pinpoint timbral accuracy or a mid-centric sound to enjoy. Pink Floyd’s atmospheric soundscapes benefit tremendously from this approach, with the spacious staging allowing each element to breathe naturally.
Bass is definitely where this IEM begins (and ends) – that giant 14mm planar driver really hitting the lows with full force. It’s not quite a ‘wall of bass’ effect like Astrolith can muster, but it digs just as deep with a palpable rumble where necessary. The opening moments of Money showcase this beautifully, with that iconic bass line rendered with impressive extension and clarity.
Interestingly, I find the bass lacks some punch and weight on occasion, despite its reach and elevation – not quite pillowy but softer than a good dynamic driver. To be fair, I found the same ‘issue’ with Astrolith, so it’s likely more my perception of the faster, lithier planar magnetic bass rather than a fault of the IEM or tuning choices.
A good example here is the double electronic bass drop in Armin Van Buuren’s intro to Intense, and then throughout that epic track. When the bass hits, it doesn’t quite shake my fillings, even compared to bassy (but not basshead) dynamic driver IEMs like Clara and Spectrumica. Instead, it almost flaps the initial hit, and the rumble generated afterwards peters out quite quickly rather than lingering with texture.
This speed gives Grand Luna’s bass an advantage when it comes to faster drum ‘n’ bass music and similar genres, where lingering bass is not ideal, but the sheer volume of midbass still warms up the overall sound, often to the detriment of the midrange.
Which brings us to the midrange, which, as I mentioned earlier, is relatively neutral, clean and clear, but not particularly rich, and all too often blanketed by residual midbass. This is mostly notable with vocal-centric tracks, where subtle nuances and vocal inflections are harder to pick out – even though the detail is all there when I listen for it.
Lana Del Rey’s breathy delivery in tracks like Venice Bitch loses some of its intimate character, though the dreamlike quality of her music still comes through beautifully.
This is more than likely a tuning choice, designed to expand stage perception and place more focus on instrument fundamentals. It’s also not a big issue if your library isn’t filled with mostly vocal-driven music like mine is, but even then, I still find myself enjoying Grand Luna’s sound with modern pop and electronic pop, older rock, and anything instrumental.
Def Leppard’s layered productions work particularly well, for example, with the recessed mids allowing the massive drum sounds and guitar textures to take centre stage.
If you’re looking for lush and organic mids, you won’t find them here. Even though there’s plenty of warm infusion from the bass, mids remain fairly lean, but they’re not thin or brittle either. There’s a cleanliness to the mids, especially on well-recorded tracks, that the large planar driver presents ever so pleasantly.
Upper midrange is, however, notably recessed on this set, which is great if you don’t want shouty vocals, but the choice to have lower treble rise sharply from the upper midrange valley does make some female vocals come off as overly thin and edgy. Nina Nesbitt’s more delicate vocal passages can sound a touch distant, though her more energetic choruses benefit from the treble sparkle.
I’m not sure if this is a consequence of the crossover from planar midrange to BA treble, or more a factor of the tuning, but even though I don’t find Grand Luna’s treble to be peaky or sibilant, there’s an edge to it somewhere in the lower treble that I can’t quite put my finger on.
This is also library dependent, as I’ve come across many tracks – even female vocal tracks like Norah Jones’ more intimate recordings – where the treble is simply smooth and sufficiently sparkly, so your mileage may vary.
If I zoom out and look at the overall tonality, Grand Luna is very much a smooth, easy listen, with plenty of bass warmth (rather than actual slam), a competent, generally clear midrange, topped by detailed but smooth, polite and not overly-airy treble.
Compared to Astrolith’s v-shaped intensity, Grand Luna is far milder, and will better suit those listeners wanting to kick back and let the music wash over them without being grabbed by the eyeballs with every note. Think Enya’s ethereal soundscapes to get a sense of my meaning here, rendered with an appropriately dreamy quality that perfectly suits the music’s intended mood.
Technical performance
With a planar driver and equally nimble BA tweeters, you’d expect Grand Luna to be fast and detailed, and it generally is just that. Resolution is well above average, even though the midbass blanket makes it difficult to pick out the smallest minutiae. I will note at this point that a cable swap can and does make a big difference to this aspect, so if you’re looking for more detail and clarity, read through the tweaking section of this review later on.
Staging is big, although I wouldn’t quite call it grand (enough with the puns already). This is more satellite moon than actual moon in terms of perceivable stage size, with a wide and deep stage that gives performances plenty of space to breathe – just not quite the live stadium experience.
The Eagles’ live rendition of Hotel California, a classic staging test track, still benefits from this spacious presentation, with the acoustic guitars and vocal harmonies given room to develop naturally across the soundscape, but it’s more small venue live than grand arena.
As with almost every Campfire IEM before it, imaging and separation are right on point. Background is nicely dark too, which helps with placing elements on the stage more precisely. Bon Jovi’s layered rock productions are rendered with impressive instrument separation, even when the mix gets busy during the choruses.
Dynamics is one place where Grand Luna suffers, not in a big way, but certainly compared to most good dynamic driver IEMs in my experience. The swings between loud and soft are there, especially at higher volume, but the reduced impact and weight of the bass attack tends to hold back some dynamic potency.
Overall, there’s not much to pick out as lacking when it comes to technical performance, and in fact I’d grade Grand Luna above average on most aspects at this price point, especially if you’re not someone who lives and dies by the dynamic range of your IEMs.
Again, this makes Grand Luna better suited for more relaxed listens, like smoky jazz with a glass of red as opposed to high-energy EDM on a dancefloor. Well-recorded music, even vocal-centric, will benefit from the detail on offer, and as long as bass isn’t blasted into the mix, clarity should be good to excellent throughout.
Flower Face’s delicate indie folk productions showcase this beautifully, with every subtle guitar pluck and whispered vocal nuance coming through clearly.
If I had to characterise Grand Luna’s sound performance in a sentence, I’d say it’s a deliberately warm-tilted, smooth, seductive IEM ideal for fun, relaxed listening with most genres that don’t demand purist neutrality, lithe bass, exaggerated treble, or utmost clarity.
There are many other IEMs better suited for reference listening, or for high-energy engagement, even several from Campfire’s current portfolio. Grand Luna is something wholly different from those, giving you a way to just have fun with your music and experience it in a new way that doesn’t simply rehash the ‘same old, same old’. It’s not a bright IEM, but not dark either; nor is it particularly ‘grand’.
Perhaps Red Luna would have been a better moniker, because it does take some risks with the tuning direction and gives you that rare twist on the familiar you won’t find in most other IEMs.
Continue to select comparisons…
