diff --git a/README.md b/README.md
index 9d961f9..31352eb 100644
--- a/README.md
+++ b/README.md
@@ -38,7 +38,7 @@ You can change compression mode by `-m` option.
 Following example encoding in maximum compression (but slow) option.
 
 ```bash
-./srla -e -m 16 INPUT.wav OUTPUT.srl
+./srla -e -m 4 INPUT.wav OUTPUT.srl
 ```
 #### Max block size `-B`
 
diff --git a/include/srla.h b/include/srla.h
index da3698d..d11d924 100644
--- a/include/srla.h
+++ b/include/srla.h
@@ -7,7 +7,7 @@
 #define SRLA_FORMAT_VERSION         4
 
 /* コーデックバージョン */
-#define SRLA_CODEC_VERSION          6
+#define SRLA_CODEC_VERSION          7
 
 /* ヘッダサイズ */
 #define SRLA_HEADER_SIZE            29
@@ -19,7 +19,7 @@
 #define SRLA_MAX_COEFFICIENT_ORDER  256
 
 /* パラメータプリセット数 */
-#define SRLA_NUM_PARAMETER_PRESETS  18
+#define SRLA_NUM_PARAMETER_PRESETS  5
 
 
 /* API結果型 */
diff --git a/libs/srla_internal/src/srla_internal.c b/libs/srla_internal/src/srla_internal.c
index e9d746a..fbf8bc3 100644
--- a/libs/srla_internal/src/srla_internal.c
+++ b/libs/srla_internal/src/srla_internal.c
@@ -23,30 +23,16 @@ SRLA_STATIC_ASSERT((1 << SRLA_LPC_COEFFICIENT_BITWIDTH) == SRLA_NUM_ARRAY_ELEMEN
 /* 和を取った係数のハフマン木 */
 static struct StaticHuffmanTree st_sum_parameter_huffman_tree = { 0, };
 
-
 /* マージンリスト候補配列 */
 static const double margin_list[] = { 0.0, 1.0 / 4096, 1.0 / 1024, 1.0 / 256, 1.0 / 64, 1.0 / 16 };
 
 /* パラメータプリセット配列 */
 const struct SRLAParameterPreset g_srla_parameter_preset[] = {
-    {  32, SRLA_CH_PROCESS_METHOD_TACTICS_ADAPTIVE, SRLA_LPC_ORDER_DECISION_TACTICS_MAX_FIXED,  0, SRLA_DEFINE_ARRAY_AND_NUM_ELEMTNS_TUPLE(margin_list) },
-    {  32, SRLA_CH_PROCESS_METHOD_TACTICS_ADAPTIVE, SRLA_LPC_ORDER_DECISION_TACTICS_MAX_FIXED, 10, SRLA_DEFINE_ARRAY_AND_NUM_ELEMTNS_TUPLE(margin_list) },
+    {  16, SRLA_CH_PROCESS_METHOD_TACTICS_ADAPTIVE, SRLA_LPC_ORDER_DECISION_TACTICS_BRUTEFORCE_ESTIMATION,  0, SRLA_DEFINE_ARRAY_AND_NUM_ELEMTNS_TUPLE(margin_list) },
     {  32, SRLA_CH_PROCESS_METHOD_TACTICS_ADAPTIVE, SRLA_LPC_ORDER_DECISION_TACTICS_BRUTEFORCE_ESTIMATION,  0, SRLA_DEFINE_ARRAY_AND_NUM_ELEMTNS_TUPLE(margin_list) },
-    {  32, SRLA_CH_PROCESS_METHOD_TACTICS_ADAPTIVE, SRLA_LPC_ORDER_DECISION_TACTICS_BRUTEFORCE_ESTIMATION, 10, SRLA_DEFINE_ARRAY_AND_NUM_ELEMTNS_TUPLE(margin_list) },
-    {  32, SRLA_CH_PROCESS_METHOD_TACTICS_ADAPTIVE, SRLA_LPC_ORDER_DECISION_TACTICS_BRUTEFORCE_SEARCH,  0, SRLA_DEFINE_ARRAY_AND_NUM_ELEMTNS_TUPLE(margin_list) },
-    {  32, SRLA_CH_PROCESS_METHOD_TACTICS_ADAPTIVE, SRLA_LPC_ORDER_DECISION_TACTICS_BRUTEFORCE_SEARCH, 10, SRLA_DEFINE_ARRAY_AND_NUM_ELEMTNS_TUPLE(margin_list) },
-    {  64, SRLA_CH_PROCESS_METHOD_TACTICS_ADAPTIVE, SRLA_LPC_ORDER_DECISION_TACTICS_MAX_FIXED,  0, SRLA_DEFINE_ARRAY_AND_NUM_ELEMTNS_TUPLE(margin_list) },
-    {  64, SRLA_CH_PROCESS_METHOD_TACTICS_ADAPTIVE, SRLA_LPC_ORDER_DECISION_TACTICS_MAX_FIXED, 10, SRLA_DEFINE_ARRAY_AND_NUM_ELEMTNS_TUPLE(margin_list) },
     {  64, SRLA_CH_PROCESS_METHOD_TACTICS_ADAPTIVE, SRLA_LPC_ORDER_DECISION_TACTICS_BRUTEFORCE_ESTIMATION,  0, SRLA_DEFINE_ARRAY_AND_NUM_ELEMTNS_TUPLE(margin_list) },
-    {  64, SRLA_CH_PROCESS_METHOD_TACTICS_ADAPTIVE, SRLA_LPC_ORDER_DECISION_TACTICS_BRUTEFORCE_ESTIMATION, 10, SRLA_DEFINE_ARRAY_AND_NUM_ELEMTNS_TUPLE(margin_list) },
-    { 128, SRLA_CH_PROCESS_METHOD_TACTICS_ADAPTIVE, SRLA_LPC_ORDER_DECISION_TACTICS_MAX_FIXED,  0, SRLA_DEFINE_ARRAY_AND_NUM_ELEMTNS_TUPLE(margin_list) },
-    { 128, SRLA_CH_PROCESS_METHOD_TACTICS_ADAPTIVE, SRLA_LPC_ORDER_DECISION_TACTICS_MAX_FIXED, 10, SRLA_DEFINE_ARRAY_AND_NUM_ELEMTNS_TUPLE(margin_list) },
     { 128, SRLA_CH_PROCESS_METHOD_TACTICS_ADAPTIVE, SRLA_LPC_ORDER_DECISION_TACTICS_BRUTEFORCE_ESTIMATION,  0, SRLA_DEFINE_ARRAY_AND_NUM_ELEMTNS_TUPLE(margin_list) },
-    { 128, SRLA_CH_PROCESS_METHOD_TACTICS_ADAPTIVE, SRLA_LPC_ORDER_DECISION_TACTICS_BRUTEFORCE_ESTIMATION, 10, SRLA_DEFINE_ARRAY_AND_NUM_ELEMTNS_TUPLE(margin_list) },
-    { 256, SRLA_CH_PROCESS_METHOD_TACTICS_ADAPTIVE, SRLA_LPC_ORDER_DECISION_TACTICS_MAX_FIXED,  0, SRLA_DEFINE_ARRAY_AND_NUM_ELEMTNS_TUPLE(margin_list) },
-    { 256, SRLA_CH_PROCESS_METHOD_TACTICS_ADAPTIVE, SRLA_LPC_ORDER_DECISION_TACTICS_MAX_FIXED, 10, SRLA_DEFINE_ARRAY_AND_NUM_ELEMTNS_TUPLE(margin_list) },
     { 256, SRLA_CH_PROCESS_METHOD_TACTICS_ADAPTIVE, SRLA_LPC_ORDER_DECISION_TACTICS_BRUTEFORCE_ESTIMATION,  0, SRLA_DEFINE_ARRAY_AND_NUM_ELEMTNS_TUPLE(margin_list) },
-    { 256, SRLA_CH_PROCESS_METHOD_TACTICS_ADAPTIVE, SRLA_LPC_ORDER_DECISION_TACTICS_BRUTEFORCE_ESTIMATION, 10, SRLA_DEFINE_ARRAY_AND_NUM_ELEMTNS_TUPLE(margin_list) },
 };
 SRLA_STATIC_ASSERT(SRLA_NUM_ARRAY_ELEMENTS(g_srla_parameter_preset) == SRLA_NUM_PARAMETER_PRESETS);
 
diff --git a/tools/srla_codec/srla_codec.c b/tools/srla_codec/srla_codec.c
index 35be807..88783e7 100644
--- a/tools/srla_codec/srla_codec.c
+++ b/tools/srla_codec/srla_codec.c
@@ -9,13 +9,13 @@
 #include <sys/stat.h>
 
 /* デフォルトプリセット */
-#define DEFALUT_PRESET_NO 12
+#define DEFALUT_PRESET_INDEX 2
 /* デフォルトの最大ブロックサンプル数 */
 #define DEFALUT_MAX_NUM_BLOCK_SAMPLES 4096
 /* デフォルトの可変ブロック分割数 */
 #define DEFALUT_NUM_VARIABLE_BLOCK_DIVISIONS 1
 /* パラメータプリセットの最大インデックス */
-#define SRLA_MAX_PARAMETER_PRESETS_INDEX 17
+#define SRLA_MAX_PARAMETER_PRESETS_INDEX 4
 #if SRLA_MAX_PARAMETER_PRESETS_INDEX != (SRLA_NUM_PARAMETER_PRESETS - 1)
 #error "Max parameter presets mismatched to number of parameter presets!"
 #endif
@@ -336,7 +336,7 @@ int main(int argc, char** argv)
         }
     } else if (CommandLineParser_GetOptionAcquired(command_line_spec, "encode") == COMMAND_LINE_PARSER_TRUE) {
         /* エンコード */
-        uint32_t encode_preset_no = DEFALUT_PRESET_NO;
+        uint32_t encode_preset_no = DEFALUT_PRESET_INDEX;
         uint32_t max_num_block_samples = DEFALUT_MAX_NUM_BLOCK_SAMPLES;
         uint32_t variable_block_num_divisions = DEFALUT_NUM_VARIABLE_BLOCK_DIVISIONS;
         /* エンコードプリセット番号取得 */