diff --git a/src/device/ai.rs b/src/device/ai.rs
index 548b289..5552c4d 100644
--- a/src/device/ai.rs
+++ b/src/device/ai.rs
@@ -45,11 +45,10 @@ fn get_remaining_dma_length(device: &device::Device) -> u64 {
 }
 
 fn get_dma_duration(device: &device::Device) -> u64 {
-    let samples_per_sec = device.vi.clock / (1 + device.ai.regs[AI_DACRATE_REG as usize]) as u64;
     let bytes_per_sample = 4; /* XXX: assume 16bit stereo - should depends on bitrate instead */
     let length = (device.ai.regs[AI_LEN_REG as usize] & !7) as u64;
 
-    length * (device.cpu.clock_rate / (bytes_per_sample * samples_per_sec))
+    length * (device.cpu.clock_rate / (bytes_per_sample * device.ai.freq))
 }
 
 fn do_dma(device: &mut device::Device) {
diff --git a/src/ui/audio.rs b/src/ui/audio.rs
index b81ad9d..536e555 100644
--- a/src/ui/audio.rs
+++ b/src/ui/audio.rs
@@ -85,8 +85,8 @@ pub fn play_audio(device: &device::Device, dram_addr: usize, length: u64) {
 
     let audio_queued =
         unsafe { sdl3_sys::audio::SDL_GetAudioStreamQueued(device.ui.audio.audio_stream) } as f64;
-    let acceptable_latency = (device.ai.freq as f64 * 0.2) * 4.0;
-    let min_latency = (device.ai.freq as f64 * 0.02) * 4.0;
+    let min_latency = device.ai.freq as f64 * device.vi.frame_time * 4.0;
+    let acceptable_latency = min_latency * 8.0;
 
     if audio_queued < min_latency {
         let silence_buffer: Vec<u8> = vec![0; min_latency as usize & !3];