Burr-Brown DAC supporting APTX, APTX LL, AAC, APTX HD and SBC codecs. Bluetooth is often dismissed as a convenience feature, but in a lot of situations it’ s the difference between being able to accurately check a band arrangement straight from Planning Center on someone’ s phone, auditioning reference mixes during a production meeting, or running a quick musical idea for the team without patching anything. O. H. M. makes these spontaneous workflows sound legitimately good, not like a compressed afterthought.
The most distinctive feature of Heritage Audio O. H. M. Headphone Amp is the impedancematching output section. At its core is a sixposition impedance selector offering Low, 32 Ω, 50 Ω, 80 Ω, 250 Ω, and 600 Ω settings. For mix engineers who work with a variety of headphones and in-ears this is huge. Budget IEMs, pro touring in-ears, open-back reference headphones, and classic 250-ohm studio cans all behave differently depending on the stage driving them. Without proper impedance matching, low-impedance IEMs can sound overly bright or aggressive, while high-impedance cans may seem dull or underpowered. With the O. H. M., the worship drummer’ s IEMs can hit with full punch, while the FOH engineer’ s open-back headphones can maintain their intended neutrality, and the worship pastor or musical director reviewing service transitions on consumer headphones can still hear an accurate representation of the mix. For teams that rotate musicians or rely on volunteers bringing their own gear, this level of consistency is invaluable.
Internally, the O. H. M. is built around discrete diamond buffers and Burr-Brown op-amps running from an external 30-volt power supply— design choices that grant it the kind of headroom normally associated with mastering gear. That translates into effortless driving power across the entire impedance range, wide dynamic response, and extremely low noise. For worship applications, the effect is immediate. Pads bloom without harshness,
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