If you are encountering this issue, you are likely using a modern version of MAME (version 0.186 or newer) alongside an outdated arcade ROM set.
The root cause of this error lies in a major architectural update introduced in and finalized in 0.201 .
The files dl-1425.bin and qsound_hle.zip represent an important chapter in the ongoing evolution of arcade emulation. They are the result of years of reverse engineering, community collaboration, and technical refinement aimed at preserving Capcom's CPS-2 audio legacy. For the average user, encountering the missing dl-1425.bin error is often the first introduction to the complex relationship between MAME versions, ROM sets, and support files.
The files and qsound-hle.zip are essential BIOS components used by emulators (like MAME or FB Neo) to accurately play Capcom arcade games that utilize the "QSound" audio system. What is QSound?
Because MAME treats qsound_hle.zip as a system BIOS, individual game ROMs do not package it inside their own zip folders. Follow these steps to rectify the error. Fix 1: The Quick Duplicate Trick dl-1425.bin qsound-hle.zip
If you've ever tried to launch a Capcom game in MAME and seen a "dl-1425.bin NOT FOUND" error, it’s because MAME treats this audio program as a separate hardware requirement. dl-1425.bin file
The solution is straightforward. The dl-1425.bin file is the correct one, and it should be placed inside a zip file named qsound_hle.zip and stored in your MAME roms folder.
The HLE method exists as a clean-room workaround, but nothing beats the accuracy of the real firmware. If you truly own a CPS-2 arcade board, dumping your own dl-1425.bin is legally permissible (depending on your jurisdiction).
The qsound-hle.zip file is outdated and missing the internal dl-1425.bin file. Your emulator is looking in the wrong directory. Step-by-Step Fix for MAME, FB Neo, and RetroArch If you are encountering this issue, you are
Introduced in 1993 with the release of Super Street Fighter II , the QSound subsystem provided early 3D spatial audio. By applying precise Finite Impulse Response (FIR) filters and crosstalk cancellation algorithms to a standard stereo configuration, the chip tricked the human ear into hearing sounds outside the boundaries of the physical cabinet speakers. The processor manages:
You added dl-1425.bin to qsound-hle.zip . MAME no longer complains about missing files. Yet, your Capcom game (e.g., Captain Commando or Knights of the Round ) still has no sound. What now?
The naming convention dl-1425.bin comes from Sega’s internal labeling system for firmware components— DL likely refers to "Download" or "Driver Library," while 1425 is a revision or hardware identifier. When dumping original arcade boards for preservation, these filenames were retained to ensure bit-for-bit accuracy.
Because MAME demands exact matches, old ROM sets lack this file, triggering immediate crashes when loading any QSound-dependent arcade game. Technical Specifications of dl-1425.bin They are the result of years of reverse
This method assumes you have an older, working version of MAME or a ROMset that contains the legacy qsound.zip file.
The emulation of the QSound chip continues to evolve. Recent commits to the MAME codebase include:
Alien vs. Predator , Armored Warriors , Dungeons & Dragons: Shadow over Mystara . Shooters & Shmups: Giga Wing , Progear , Mars Matrix . Troubleshooting Ongoing Issues