Apogee BOOM vs Roland BRIDGE CAST

Both are audio interfaces, $299 against $340. This page puts them side by side on the only three things a maker can be held to — power, output impedance and noise — and then asks the question that actually matters: which headphones do they treat differently?

The Apogee BOOM reaches 100 dB on 565 of the 567 models here, the Roland BRIDGE CAST on 558.

A figure marked not published is missing from the maker’s own material, which is not the same as being good or bad. Where one of these two publishes a number and the other does not, the comparison on that axis cannot be made at all — and saying so is more useful than guessing.

Both makers publish a power rating, which is less common than the table above makes it look: of the 280 sources here, 209 publish a figure at at least one load and only 2 publish one at all four. Apogee BOOM publishes at 32 Ω; Roland BRIDGE CAST at 32 Ω. Every other row is worked out from those — between two published loads, or beyond them holding voltage constant, which understates rather than flatters.

The two publish at the same loads, which is the one case where the rows of this table can be read straight across.

What each of these labels means, and why a derived figure is still worth printing, is set out in how this data was built.

7 headphones reach 100 dB on the Apogee BOOM but not on the Roland BRIDGE CAST — Moondrop COSMO, Moondrop PARA 2, Moondrop VENUS, 4 more.

509 headphones are left alone by the Apogee BOOM under the one-eighth rule but coloured by the Roland BRIDGE CAST (64 Audio Aspire 1, 64 Audio Fourte, 64 Audio Nio, 506 more).

558 of the 567 models here reach 100 dB on both. That is a power count and nothing more; whether either source suits a given headphone also depends on the two lines above.

The counts above say how many models the two treat differently. This says by how much. The same 8 headphones appear on every page of this kind, ordered from the easiest to drive to the hardest, so a row can be read across pages as well as across columns. Headroom is at a 100 dB SPL peak.

The widest gap on the list is the HiFiMAN HE400se: Apogee BOOM has +14 dB of headroom there against +9 dB. 5 dB is about 3.1 times the power, which matters for peaks rather than for how loud the music sits.

The hiss columns are empty for Apogee BOOM and Roland BRIDGE CAST because neither maker publishes no output noise figure. That is a gap in the specification, not a quiet amplifier, and it is left blank here rather than filled with a plausible number.

The Roland BRIDGE CAST costs $41 more than the Apogee BOOM, and on these three axes the money buys nothing: among the 567 models here there is not one that the Roland BRIDGE CAST handles and the Apogee BOOM does not — not on power, not on the one-eighth rule, not on hiss. The traffic runs the other way: the cheaper Apogee BOOM drives 7 models to 100 dB and leaves 509 alone under the one-eighth rule that the Roland BRIDGE CAST does not.

Everything in this paragraph counts only figures the two makers published. An advantage on an axis one of them leaves blank cannot be counted, and is not counted — how often that happens is its own page.

Each has a page of its own with every power figure traced to what the maker published and a full headphone list: Apogee BOOM and Roland BRIDGE CAST. Or put either against your own headphones in the source comparison tool.