diff --git a/sys/dev/sound/pcm/feeder_eq.c b/sys/dev/sound/pcm/feeder_eq.c
--- a/sys/dev/sound/pcm/feeder_eq.c
+++ b/sys/dev/sound/pcm/feeder_eq.c
@@ -109,6 +109,7 @@
 	struct feed_eq_tone bass;
 	struct feed_eq_coeff *coeff;
 	uint32_t fmt;
+	uint32_t bps;
 	uint32_t channels;
 	uint32_t rate;
 	uint32_t align;
@@ -140,9 +141,9 @@
 
 	if (info->state == FEEDEQ_DISABLE) {
 		j = count * info->channels;
-		dst += j * AFMT_BPS(info->fmt);
+		dst += j * info->bps;
 		do {
-			dst -= AFMT_BPS(info->fmt);
+			dst -= info->bps;
 			v = pcm_sample_read(dst, info->fmt, false);
 			v = ((intpcm64_t)pmul * v) >> pshift;
 			pcm_sample_write(dst, v, info->fmt, false);
@@ -188,7 +189,7 @@
 			info->bass.o1[i] = v;
 
 			pcm_sample_write(dst, v, info->fmt, true);
-			dst += AFMT_BPS(info->fmt);
+			dst += info->bps;
 			i++;
 		} while (--j != 0);
 	} while (--count != 0);
@@ -273,8 +274,9 @@
 		return (ENOMEM);
 
 	info->fmt = AFMT_ENCODING(f->desc->in);
+	info->bps = AFMT_BPS(f->desc->in);
 	info->channels = AFMT_CHANNEL(f->desc->in);
-	info->align = info->channels * AFMT_BPS(f->desc->in);
+	info->align = info->channels * info->bps;
 
 	info->rate = FEEDEQ_RATE_MIN;
 	info->treble.gain = FEEDEQ_L2GAIN(50);
@@ -299,7 +301,7 @@
 		if (value < SND_CHN_MIN || value > SND_CHN_MAX)
 			return (EINVAL);
 		info->channels = (uint32_t)value;
-		info->align = info->channels * AFMT_BPS(f->desc->in);
+		info->align = info->channels * info->bps;
 		feed_eq_reset(info);
 		break;
 	case FEEDEQ_RATE: