diff --git a/src/meta/ngc_dsp_asura.c b/src/meta/ngc_dsp_asura.c
index cd0c8143..26c0d23d 100644
--- a/src/meta/ngc_dsp_asura.c
+++ b/src/meta/ngc_dsp_asura.c
@@ -18,8 +18,8 @@ VGMSTREAM* init_vgmstream_dsp_asura_sfx(STREAMFILE* sf) {
 
     /* no clear header id, but this is how they all start */
     /* the 0x02s are likely channels and codec (DSPADPCM) */
-    if (read_u32be(0x00, sf) != 0x00 &&
-        read_u32be(0x04, sf) != 0x02 &&
+    if (read_u32be(0x00, sf) != 0x00 ||
+        read_u32be(0x04, sf) != 0x02 ||
         read_u32be(0x08, sf) != 0x02)
         return NULL;
 
@@ -44,8 +44,7 @@ VGMSTREAM* init_vgmstream_dsp_asura_sfx(STREAMFILE* sf) {
     loop_flag = 0;
 
     /* more safety checks */
-    if (interleave < 0 ||
-        interleave < nibble_count / 2 ||
+    if (interleave < 0 || interleave < nibble_count / 2 ||
         interleave > get_streamfile_size(sf) / channels)
         goto fail;
 
diff --git a/src/meta/ngc_dsp_std.c b/src/meta/ngc_dsp_std.c
index e6371191..20d8e8d5 100644
--- a/src/meta/ngc_dsp_std.c
+++ b/src/meta/ngc_dsp_std.c
@@ -1580,9 +1580,10 @@ VGMSTREAM* init_vgmstream_dsp_asura(STREAMFILE* sf) {
     uint8_t flag;
 
     /* checks */
-    if (!is_id32be(0x00, sf, "DSP\x00") && /* GC */
-        !is_id32be(0x00, sf, "DSP\x01") && /* GC/Wii/WiiU */
-        !is_id32be(0x00, sf, "DSP\x02"))   /* WiiU */
+    /* "DSP\x00" (GC), "DSP\x01" (GC/Wii/WiiU), "DSP\x02" (WiiU) */
+    if ((read_u32be(0x00, sf) & 0xFFFFFF00) != get_id32be("DSP\0"))
+        return NULL;
+    if (read_u8(0x03, sf) < 0x00 || read_u8(0x03, sf) > 0x02)
         return NULL;
 
     /* .dsp: Judge Dredd (GC)
@@ -1590,7 +1591,7 @@ VGMSTREAM* init_vgmstream_dsp_asura(STREAMFILE* sf) {
     if (!check_extensions(sf, "dsp,wav,lwav"))
         return NULL;
 
-    /* flag set to 0x00 so far only seen in Judge Dredd, which also uses 0x01
+    /* flag set to 0x00 so far only seen in Judge Dredd, which also uses 0x01.
      * at first assumed being 0 means it has a stream name at 0x48 (unlikely) */
     /* flag set to 0x02 means it's ddsp-like stereo */
     flag = read_u8(0x03, sf);