diff --git a/firmware/common/dsp_fir_taps.hpp b/firmware/common/dsp_fir_taps.hpp
index b783b8f1..dd9bda9e 100644
--- a/firmware/common/dsp_fir_taps.hpp
+++ b/firmware/common/dsp_fir_taps.hpp
@@ -191,27 +191,27 @@ constexpr fir_taps_real<32> taps_6k0_channel {
 
 // USB AM 2K80J3E emission type ///////////////////////////////////////////
 
-// IFIR prototype filter: fs=48000, pass=3000, stop=6700, decim=1, fout=48000
+// IFIR prototype filter: fs=12000, pass=3000, stop=3300, decim=1, fout=12000
 constexpr fir_taps_complex<64> taps_2k8_usb_channel {
 	.pass_frequency_normalized = 3000.0f / 12000.0f,
 	.stop_frequency_normalized = 3300.0f / 12000.0f,
 	.taps = { {
-		{  -146,     0 }, {   -41,   -45 }, {    -1,    10 }, {   -95,    69 },
-		{  -194,   -41 }, {   -91,  -158 }, {    14,   -43 }, {  -150,    67 },
-		{  -299,  -133 }, {  -100,  -307 }, {    50,   -86 }, {  -254,    54 },
-		{  -453,  -329 }, {   -62,  -587 }, {   170,  -189 }, {  -334,     0 },
-		{  -580,  -645 }, {   104,  -986 }, {   418,  -304 }, {  -412,   -88 },
-		{  -680, -1178 }, {   527, -1623 }, {   970,  -432 }, {  -441,  -196 },
-		{  -698, -2149 }, {  1617, -2800 }, {  2384,  -507 }, {  -429,  -311 },
-		{  -545, -5181 }, {  6925, -7691 }, { 14340,     0 }, { 10601, 11773 },
-		{ -1499, 14261 }, { -8373,  6083 }, { -5095, -1083 }, {  -265,  -459 },
-		{  -753,  2318 }, { -2954,  1315 }, { -2064,  -919 }, {  -149,  -459 },
-		{  -531,   920 }, { -1669,   355 }, { -1100,  -800 }, {   -44,  -419 },
-		{  -346,   384 }, {  -992,     0 }, {  -580,  -645 }, {    35,  -332 },
-		{  -205,   149 }, {  -577,  -123 }, {  -280,  -485 }, {    80,  -247 },
-		{   -91,    40 }, {  -294,  -131 }, {  -101,  -312 }, {    82,  -142 },
-		{   -44,     9 }, {  -147,  -107 }, {   -21,  -197 }, {    79,   -88 },
-		{    10,     0 }, {   -41,   -45 }, {    15,  -145 }, {     0,     0 },
+		{   -146,      0 }, {    -41,    -45 }, {     -1,     10 }, {    -95,     69 },
+		{   -194,    -41 }, {    -91,   -158 }, {     14,    -43 }, {   -150,     67 },
+		{   -299,   -133 }, {   -100,   -307 }, {     50,    -86 }, {   -254,     54 },
+		{   -453,   -329 }, {    -62,   -587 }, {    170,   -189 }, {   -334,      0 },
+		{   -580,   -645 }, {    104,   -986 }, {    418,   -304 }, {   -412,    -88 },
+		{   -680,  -1178 }, {    527,  -1623 }, {    970,   -432 }, {   -441,   -196 },
+		{   -698,  -2149 }, {   1617,  -2800 }, {   2384,   -507 }, {   -429,   -311 },
+		{   -545,  -5181 }, {   6925,  -7691 }, {  14340,      0 }, {  10601,  11773 },
+		{  -1499,  14261 }, {  -8373,   6083 }, {  -5095,  -1083 }, {   -265,   -459 },
+		{   -753,   2318 }, {  -2954,   1315 }, {  -2064,   -919 }, {   -149,   -459 },
+		{   -531,    920 }, {  -1669,    355 }, {  -1100,   -800 }, {    -44,   -419 },
+		{   -346,    384 }, {   -992,      0 }, {   -580,   -645 }, {     35,   -332 },
+		{   -205,    149 }, {   -577,   -123 }, {   -280,   -485 }, {     80,   -247 },
+		{    -91,     40 }, {   -294,   -131 }, {   -101,   -312 }, {     82,   -142 },
+		{    -44,      9 }, {   -147,   -107 }, {    -21,   -197 }, {     79,    -88 },
+		{     10,      0 }, {    -41,    -45 }, {     15,   -145 }, {      0,      0 },
 	} },
 };