FATFreq Grand Maestro VS AME Mousa
IEM Comparison: Expert & Community Scores Side-by-Side
FATFreq Grand Maestro and AME Mousa use 1DD+8BA+4EST and 13BA+2BC driver setups respectively. FATFreq Grand Maestro costs $3,334 while AME Mousa costs $4,500. AME Mousa is $1,166 more expensive. FATFreq Grand Maestro holds a slight 0.3-point edge in reviewer scores (8.6 vs 8.2). AME Mousa has slightly better bass with a 0.3-point edge, FATFreq Grand Maestro has better treble with a 0.8-point edge, AME Mousa has slightly better dynamics with a 0.3-point edge, FATFreq Grand Maestro has significantly better soundstage with a 2-point edge, AME Mousa has significantly better details with a 1.8-point edge and AME Mousa has significantly better imaging with a 1.3-point edge.
Insights
| Metric | FATFreq Grand Maestro | AME Mousa |
|---|---|---|
| Bass | 7.8 | 8 |
| Mids | 6.8 | 7 |
| Treble | 7.5 | 6.8 |
| Details | 6.8 | 8.5 |
| Soundstage | 9 | 7 |
| Imaging | 7.3 | 8.5 |
| Dynamics | 8.5 | 8.8 |
| Tonality | 8.2 | 7.4 |
| Technicalities | 8.1 | 7.3 |
FATFreq Grand Maestro Aggregated Review Score
Average Reviewer Scores
Average Reviewer Score:
8.6Excellent
AME Mousa Aggregated Review Score
Average Reviewer Scores
Average Reviewer Score:
8.2Very Positive
Reviews Comparison
FATFreq Grand Maestro reviewed by Jaytiss
9.3
Reviewer Score
Jaytiss Youtube Channel
AME Mousa reviewed by Jaytiss
8
Reviewer Score
Youtube Video Summary
AME Mousa goes all-in on extravagance: a 15-driver array (BA stack plus two bone conductors) in a massive, impeccably finished shell with a faceplate that hints at Damascus-steel swirls. The $4,500 package feels ultra-premium—weighty presentation box, desk display case, metal tip cards (fancy but a bit fiddly), and a tidy stock cable that looks good yet lacks a chin slider. Fit will depend on ear size: the shells are very thick and heavy, though ergonomics and finish are smooth. Overall unboxing and build scream luxury.
Sonically it hits a warm, energizing V-shape with impactful bass, dynamic highs, and full-bodied vocals; sibilance is minimal and the set shines at higher volumes. Tuning isn’t neutral—expect a 1 kHz dip and lively 4–6 kHz energy—so it thrills more than it analyzes, and can edge toward fatigue over marathon sessions. Versus peers, it feels richer and more rambunctious than neutral “meta-target” options (think Storm/K4 style sets), less air-starved than darker tunings like CP622B, and more bass-driven than something like Annihilator while not as modular or chameleon-like as Grand Maestro. The takeaway: a specialist, endgame-flavored IEM for listeners chasing slam, note-weight, and engagement over strict neutrality—highly enjoyable if the price and shell size aren’t deal-breakers, and best auditioned first given its bold fit and flavor.
Jaytiss Youtube Channel
FATFreq Grand Maestro reviewed by Smirk Audio
7.7
Reviewer Score
AME Mousa reviewed by Smirk Audio
8.2
Reviewer Score
FATFreq Grand Maestro reviewed by Head-Fi.org
9.5
* score rescaled + normalized
AME Mousa reviewed by Head-Fi.org
8.5
* score rescaled + normalized
FATFreq Grand Maestro (more reviews)
FATFreq Grand Maestro reviewed by Jays Audio
9.5
Reviewer Score
Youtube Video Summary
FATFreq Grand Maestro aims squarely at a refined, sub-boosted tuning rather than a crude bass cannon. The bass quality shows real pedigree—excellent control, quick decay, and that clean, floor-shaking sub-bass rumble without smearing the mids. Treble reaches higher with better extension than typical basshead fare, and overall resolution, separation, and balance feel “endgame” in polish. For listeners who want muscular low-end that still plays nice with vocals and air, this tuning reads as a mature, high-performance take on “bass + hi-fi.”
But for pure basshead cravings, Grand Maestro doesn’t go overboard—it’s a bassy set, not a “basshead or bust” one. Compared with FATFreq’s own Scarlet Mini (or Maestro Mini), it brings less sheer quantity and “skull-rattle,” trading slam for finesse; next to ultra-dark hammers like HBB Hades, it’s far more balanced and controlled. The catch is diminishing returns: while the Grand Maestro is the most refined and technically capable among these bass-tilted options, those chasing maximum pound-for-pound slam may find better value in the Minis, and those wanting reckless low-end excess will still gravitate to sets like Hades. For most non-basshead audiophiles, though, Grand Maestro’s blend of sub-bass authority and top-end refinement hits the sweet spot.
Jays Audio Youtube Channel
FATFreq Grand Maestro reviewed by Yifang
8.5
Reviewer Score
FATFreq Grand Maestro reviewed by Nymz
6.5
Reviewer Score
FATFreq Grand Maestro reviewed by Web Search
9
Reviewer Score
The FATFreq Grand Maestro offers a highly adaptable sound signature through its NOAH modules and vocal switches, enabling four distinct tuning profiles. The black NOAH module emphasizes sub-bass "slam," while the blue variant provides tighter "rumble" control; combined with the vocal switch, these allow shifts from a bass-forward signature to a more mid-centric presentation. Bass is deep and authoritative but avoids midrange bleed, while the treble—handled by electrostatic drivers—delivers clarity without sibilance or fatigue.
Technically, it excels in imaging precision and creates an immersive, three-dimensional soundstage that positions instruments with remarkable specificity. However, its large shell size may challenge those with smaller ears, and it demands power-hungry sources—often requiring high-gain amplification to reach full potential. The deluxe package includes both NOAH modules and an upgraded cable, enhancing its tuning flexibility.
FATFreq Grand Maestro Details
Driver Configuration: 1DD+8BA+4EST
Tuning Type: Neutral, Basshead
Price (Msrp): $3,334
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AME Mousa Details
Driver Configuration: 13BA+2BC
Tuning Type: Basshead
Price (Msrp): $4,500
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FATFreq Grand Maestro User Review Score
Average User Scores
Average User Score: n/a
Based on 0 user reviews
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AME Mousa User Review Score
Average User Scores
Average User Score: n/a
Based on 0 user reviews
No user reviews yet. Be the first one who writes a review!
FATFreq Grand Maestro Gaming Score
Gaming Score & Grade
- The gaming score is prioritizing technical capabilities of the IEM (Separation, Layering, Soundstage) and good value.
Gaming Score
6.6Gaming Grade
B+AME Mousa Gaming Score
Gaming Score & Grade
- The gaming score is prioritizing technical capabilities of the IEM (Separation, Layering, Soundstage) and good value.
Gaming Score
5.8Gaming Grade
B-FATFreq Grand Maestro Scorings
Average Technical & Tuning Grades
Average Tunign Grade
A+- Tuning feels refined, blending frequencies with convincing realism and engagement. Transitions between registers feel effortless.
Average Technical Grade
A+- Layering is confident and precise, backed by imaging that locks elements firmly in place. Micro-details peek through without sounding forced.
AME Mousa Scorings
Average Technical & Tuning Grades
Average Tunign Grade
A-- Tuning lands in a pleasing sweet spot with mostly coherent frequency integration. Tonality stays consistent from track to track.
Average Technical Grade
A-- The presentation feels orderly, balancing workable detail retrieval with acceptable imaging cues. It keeps momentum without smearing transients.
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