Dl-1425.bin Qsound-hle.zip Official

Originally, QSound required a custom DSP chip (the QSound Labs QS1000). Early MAME versions used low-level emulation (LLE) , which was slow and prone to desync. The shift to HLE via qsound-hle.zip in 2009 dramatically improved performance. Today, HLE is so accurate that audio engineers have used it to remaster arcade soundtracks.

This file is the raw, dumped firmware for the DSP56156 series chip found on Capcom's CPS-2 and CPS-3 arcade boards. The name "dl-1425" is likely a board or IC designation from the original hardware schematics.

Without this file, the emulator’s CPU is trying to talk to a phantom chip. It knows a coprocessor should be there to decompress and spatialize the audio streams, but the instructions are missing. The result is that infinite loop of silence.

If you have obtained a correct dl-1425.bin (verify its size is typically 32KB or 64KB and the SHA1 matches known good values): dl-1425.bin qsound-hle.zip

dl-1425.bin is not a game ROM. It is a DSP (Digital Signal Processor) microcode file. Specifically, it belongs to the Sega Model 2 arcade system board, released in 1993. The Model 2 was revolutionary for its time, delivering 3D polygon graphics that were unmatched. However, its audio architecture was complex.

The Model 2 used a specialized sound CPU (often a Motorola 68000 or similar) paired with a Sega Custom Sound Processor (SCSP) . The dl-1425.bin file contains the low-level instructions that tell the SCSP how to decode and synthesize audio streams. Without this file, the sound chip essentially "forgets" how to produce noise.

With the release of MAME’s “Model 2 rewrite” in 2022, the requirement for dl-1425.bin may eventually vanish as the emulator moves toward cycle-accurate DSP reimplementation. However, for the foreseeable future (and for all legacy builds), this file remains essential. Originally, QSound required a custom DSP chip (the

If you are reading this because X-Men vs. Street Fighter is dead silent, follow these steps:

Pro tip: Do not unzip them. Emulators expect the .zip containers. If you see qsound-hle listed in your "Available BIOS" menu but it's greyed out, you are missing the dl-1425.bin inside.

This is where things get interesting. Many users confuse qsound-hle.zip with the actual BIOS, but it is actually a High-Level Emulation (HLE) wrapper or a loader pack. Plugin fails to load:

Here is the difference:

The qsound-hle.zip package usually contains configuration data telling the emulator, "Hey, if you find dl-1425.bin, use it. If not, try to fake the audio streams anyway."

In practice, you need both.