diff --git a/Makefile b/Makefile
index 393afe1..386eca7 100644
--- a/Makefile
+++ b/Makefile
@@ -5,7 +5,7 @@ FULLNAME = $(DISTNAME)-$(VERSION)
 BIN ?= ./bin
 VST_SDK_DIR ?= .
 
-BOTH = eq eq_const noise tube
+BOTH = eq eq_const eq_const_T420 noise tube
 LADSPA = $(BOTH)
 VST = $(BOTH) delay_test
 
diff --git a/crap/eq_const_T420.h b/crap/eq_const_T420.h
new file mode 100644
index 0000000..206f2d1
--- /dev/null
+++ b/crap/eq_const_T420.h
@@ -0,0 +1,72 @@
+#include <string.h>
+
+#define ID (0x0DEFACED+420)
+#define LABEL "crap_eq_const_T420"
+#define NAME "crap T420 Speaker Compensation"
+#define AUTHOR "Connor Olding"
+#define COPYRIGHT "MIT"
+#define PARAMETERS 0
+
+#define BLOCK_SIZE 256
+
+#include "util.h"
+
+#define BANDS 12
+typedef struct {
+	biquad filters[2][BANDS];
+} personal;
+
+static void
+process_double(personal *data,
+    double *in_L, double *in_R,
+    double *out_L, double *out_R,
+    unsigned long count)
+#include "process_biquads.h"
+
+static void
+process(personal *data,
+    float *in_L, float *in_R,
+    float *out_L, float *out_R,
+    ulong count)
+#include "process_biquads.h"
+
+INNER void
+construct(personal *data)
+{}
+
+INNER void
+destruct(personal *data)
+{}
+
+INNER void
+resume(personal *data)
+{
+	biquad *filters = data->filters[0];
+	for (int i = 0; i < BANDS; i++)
+		biquad_init(&filters[i]);
+	memcpy(data->filters[1], filters, BANDS*sizeof(biquad));
+}
+
+INNER void
+pause(personal *data)
+{}
+
+INNER void
+adjust(personal *data, ulong fs)
+{
+	biquad *filters = data->filters[0];
+	// TODO: reduce ~3dB peaks at 1680, 2200
+	// TODO: reduce small peak at 600, 3780, 10600
+	filters[ 0] = biquad_gen(FILT_PEAKING,    150.,  12., 1.50, fs);
+	filters[ 1] = biquad_gen(FILT_PEAKING,    640.,  7.0, 0.80, fs);
+	filters[ 2] = biquad_gen(FILT_PEAKING,    1220, -12., 0.70, fs);
+	filters[ 3] = biquad_gen(FILT_PEAKING,    1670,  9.0, 0.18, fs);
+	filters[ 4] = biquad_gen(FILT_PEAKING,    2270,  9.0, 0.20, fs);
+	filters[ 5] = biquad_gen(FILT_PEAKING,    2470, -7.0, 0.16, fs);
+	filters[ 6] = biquad_gen(FILT_PEAKING,    3200, -0.1, 0.25, fs);
+	filters[ 7] = biquad_gen(FILT_PEAKING,    6200, -3.5, 0.25, fs);
+	filters[ 8] = biquad_gen(FILT_PEAKING,    6000, -9.0, 4.00, fs);
+	filters[ 9] = biquad_gen(FILT_PEAKING,   11560,  6.0, 0.12, fs);
+	filters[10] = biquad_gen(FILT_HIGHSHELF, 11000,  5.0, 0.50, fs);
+	filters[11] = biquad_gen(FILT_HIGHPASS,    120,  0.0, 1.00, fs);
+}