I own a Brymen 869s. Very very well made and well suited to accurate measurements in the audio range.
"Measuring audio voltages, especially at higher frequencies up to 20 kHz, requires a multimeter with good AC bandwidth specifications to ensure accurate readings. Most low-cost meters (like the Fluke 15B+ you mentioned) are limited to lower frequencies (e.g., 500-1000 Hz) because they're optimized for power-line applications (50-60 Hz). For audio work, look for true RMS meters with at least 10-20 kHz bandwidth, as they handle complex waveforms better."
"Brymen BM869s — $220-250 — Up to 100 kHz (with 4% accuracy up to 100 kHz at lower voltages) — 500,000 counts (high resolution), dual display, temperature (dual channel), VFD mode for noisy signals, CAT IV 1000V safety, optional PC interface. Excellent bandwidth for full audio range (20 Hz-20 kHz) and beyond. High precision and build quality rival premium brands at a lower cost. Ideal if you want something reliable without breaking the bank."
Quoted text is from a DeepSearch AI query. I own the 869s, and it has been going strong for years. The counts to provide precision and the full audio bandwidth are the primary relevant features. The only downside is ordering one since it's not sold on Amazon. It's also not cheap, but the resolution and bandwidth are what drive the cost.
https://www.tme.com/ux/en-us/details/bm869/portable-digital-multimeters/brymen/bm869s/The UNI-T UT161E tops out at 10 kHz, but if the >10 kHz range is not critical for your needs, it's only $95.
https://www.amazon.com/Multimeter-RockyMars-Continuity-Capacitance-Transmission/dp/B093BS9MYM?sr=8-2And the Fluke 87v tops out at 20 kHz, but it has only 20,000 counts vs. 100,000 on the Brymen. It's also more expensive, but also available on Amazon:
https://www.amazon.com/Fluke-FLUKE-87-V-Digital-Multimeter/dp/B0002YFD1K?sr=8-1