diff --git a/src/audio/src/src.c b/src/audio/src/src.c
index 9870ad911ca8..b75ff5a4cce7 100644
--- a/src/audio/src/src.c
+++ b/src/audio/src/src.c
@@ -34,19 +34,16 @@
 
 LOG_MODULE_DECLARE(src, CONFIG_SOF_LOG_LEVEL);
 
-static int src_prepare(struct processing_module *mod,
-		       struct sof_source **sources, int num_of_sources,
-		       struct sof_sink **sinks, int num_of_sinks)
+/* Set rate table pointers, compute rate indices, and copy filter stages.
+ * Must be in src.c because src_table1/2, src_in_fs, etc. come from
+ * the coefficient headers included by this file.
+ */
+static int src_setup_stages(struct processing_module *mod)
 {
 	struct comp_data *cd = module_get_private_data(mod);
 	struct src_param *a = &cd->param;
 	int ret;
 
-	comp_info(mod->dev, "entry");
-
-	if (num_of_sources != 1 || num_of_sinks != 1)
-		return -EINVAL;
-
 	a->in_fs = src_in_fs;
 	a->out_fs = src_out_fs;
 	a->num_in_fs = NUM_IN_FS;
@@ -54,27 +51,46 @@ static int src_prepare(struct processing_module *mod,
 	a->max_fir_delay_size_xnch = (PLATFORM_MAX_CHANNELS * MAX_FIR_DELAY_SIZE);
 	a->max_out_delay_size_xnch = (PLATFORM_MAX_CHANNELS * MAX_OUT_DELAY_SIZE);
 
-	src_get_source_sink_params(mod->dev, sources[0], sinks[0]);
-
 	ret = src_param_set(mod->dev, cd);
 	if (ret < 0)
 		return ret;
 
-	ret = src_allocate_copy_stages(mod, a,
-				       src_table1[a->idx_out][a->idx_in],
-				       src_table2[a->idx_out][a->idx_in]);
-	if (ret < 0)
-		return ret;
+	return src_allocate_copy_stages(mod, a,
+					src_table1[a->idx_out][a->idx_in],
+					src_table2[a->idx_out][a->idx_in]);
+}
 
-	ret = src_params_general(mod, sources[0], sinks[0]);
+static int src_do_init(struct processing_module *mod)
+{
+	struct comp_data *cd;
+	int ret;
+
+	ret = src_init(mod);
 	if (ret < 0)
 		return ret;
 
-	return src_prepare_general(mod, sources[0], sinks[0]);
+	cd = module_get_private_data(mod);
+	cd->setup_stages = src_setup_stages;
+
+	return src_init_stages(mod);
+}
+
+static int src_prepare(struct processing_module *mod,
+		       struct sof_source **sources, int num_of_sources,
+		       struct sof_sink **sinks, int num_of_sinks)
+{
+	comp_info(mod->dev, "entry");
+
+	if (num_of_sources != 1 || num_of_sinks != 1)
+		return -EINVAL;
+
+	src_get_source_sink_params(mod->dev, sources[0], sinks[0]);
+
+	return src_prepare_do(mod, sources[0], sinks[0]);
 }
 
 static const struct module_interface src_interface = {
-	.init = src_init,
+	.init = src_do_init,
 	.prepare = src_prepare,
 	.process = src_process,
 	.is_ready_to_process = src_is_ready_to_process,
diff --git a/src/audio/src/src_common.c b/src/audio/src/src_common.c
index 3a9c7dac280f..e4ccf76ae3ba 100644
--- a/src/audio/src/src_common.c
+++ b/src/audio/src/src_common.c
@@ -574,6 +574,86 @@ int src_params_general(struct processing_module *mod,
 	return 0;
 }
 
+/* Allocate delay lines and initialize the polyphase SRC filter.
+ * Assumes that cd->param rate table pointers (in_fs, out_fs, etc.)
+ * and stage pointers (stage1, stage2) are already set up via
+ * cd->setup_stages().
+ */
+int src_allocate_delay_lines(struct processing_module *mod)
+{
+	struct comp_data *cd = module_get_private_data(mod);
+	struct comp_dev *dev = mod->dev;
+	size_t delay_lines_size;
+	int32_t *buffer_start;
+	int n;
+	int ret;
+
+	/* For LL modules dev->period is already set from the pipeline.
+	 * Compute dev->frames so buffer sizing works.
+	 */
+	if (!dev->frames)
+		component_set_nearest_period_frames(dev, cd->sink_rate);
+
+	if (!cd->sink_rate) {
+		comp_err(dev, "zero sink rate");
+		return -EINVAL;
+	}
+
+	cd->source_frames = dev->frames * cd->source_rate / cd->sink_rate;
+	cd->sink_frames = dev->frames;
+
+	/* Allocate needed memory for delay lines */
+	ret = src_buffer_lengths(dev, cd, cd->channels_count);
+	if (ret < 0) {
+		comp_err(dev, "src_buffer_lengths() failed");
+		return ret;
+	}
+
+	delay_lines_size = ALIGN_UP(sizeof(int32_t) * cd->param.total, 8);
+	if (delay_lines_size == 0) {
+		comp_err(dev, "delay_lines_size = 0");
+		return -EINVAL;
+	}
+
+	mod_free(mod, cd->delay_lines);
+
+	cd->delay_lines = mod_alloc(mod, delay_lines_size);
+	if (!cd->delay_lines) {
+		comp_err(dev, "failed to alloc cd->delay_lines, delay_lines_size = %zu",
+			 delay_lines_size);
+		return -ENOMEM;
+	}
+
+	memset(cd->delay_lines, 0, delay_lines_size);
+	buffer_start = cd->delay_lines + ALIGN_UP(cd->param.sbuf_length, 2);
+
+	/* Initialize SRC for actual sample rate */
+	n = src_polyphase_init(&cd->src, &cd->param, buffer_start);
+
+	/* Reset stage buffer */
+	cd->sbuf_r_ptr = cd->delay_lines;
+	cd->sbuf_w_ptr = cd->delay_lines;
+	cd->sbuf_avail = 0;
+
+	switch (n) {
+	case 0:
+		cd->src_func = src_copy_sxx;
+		break;
+	case 1:
+		cd->src_func = src_1s;
+		break;
+	case 2:
+		cd->src_func = src_2s;
+		break;
+	default:
+		comp_info(dev, "missing coefficients for requested rates combination");
+		cd->src_func = src_fallback;
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
 int src_param_set(struct comp_dev *dev, struct comp_data *cd)
 {
 	struct src_param *a = &cd->param;
diff --git a/src/audio/src/src_common.h b/src/audio/src/src_common.h
index 98f29a263131..126b112737d3 100644
--- a/src/audio/src/src_common.h
+++ b/src/audio/src/src_common.h
@@ -167,6 +167,7 @@ struct comp_data {
 	int (*src_func)(struct comp_data *cd, struct sof_source *source,
 			struct sof_sink *sink);
 	void (*polyphase_func)(struct src_stage_prm *s);
+	int (*setup_stages)(struct processing_module *mod);
 };
 
 #if CONFIG_IPC_MAJOR_4
@@ -218,6 +219,7 @@ static inline int src_fallback(struct comp_data *cd,
 int src_allocate_copy_stages(struct processing_module *mod, struct src_param *prm,
 			     const struct src_stage *stage_src1,
 			     const struct src_stage *stage_src2);
+int src_allocate_delay_lines(struct processing_module *mod);
 int src_rate_check(const void *spec);
 int src_set_params(struct processing_module *mod, struct sof_sink *sink);
 
@@ -227,6 +229,9 @@ int src_prepare_general(struct processing_module *mod,
 			struct sof_source *source,
 			struct sof_sink *sink);
 int src_init(struct processing_module *mod);
+int src_init_stages(struct processing_module *mod);
+int src_prepare_do(struct processing_module *mod,
+		   struct sof_source *source, struct sof_sink *sink);
 
 int src_copy_sxx(struct comp_data *cd, struct sof_source *source,
 		 struct sof_sink *sink);
diff --git a/src/audio/src/src_ipc3.c b/src/audio/src/src_ipc3.c
index 541efcdb24be..636c50bfdcea 100644
--- a/src/audio/src/src_ipc3.c
+++ b/src/audio/src/src_ipc3.c
@@ -195,3 +195,27 @@ int src_init(struct processing_module *mod)
 	return 0;
 }
 
+/* IPC3: No filter allocation at init, change ipc3 behavior as little as possible */
+int src_init_stages(struct processing_module *mod)
+{
+	return 0;
+}
+
+/* IPC3: Full filter setup at prepare time */
+int src_prepare_do(struct processing_module *mod,
+		   struct sof_source *source, struct sof_sink *sink)
+{
+	struct comp_data *cd = module_get_private_data(mod);
+	int ret;
+
+	ret = cd->setup_stages(mod);
+	if (ret < 0)
+		return ret;
+
+	ret = src_params_general(mod, source, sink);
+	if (ret < 0)
+		return ret;
+
+	return src_prepare_general(mod, source, sink);
+}
+
diff --git a/src/audio/src/src_ipc4.c b/src/audio/src/src_ipc4.c
index 91f286347a5f..6e6f3c51b7be 100644
--- a/src/audio/src/src_ipc4.c
+++ b/src/audio/src/src_ipc4.c
@@ -246,3 +246,67 @@ __cold int src_init(struct processing_module *mod)
 	return 0;
 }
 
+/* Called after src_init() and setup_stages callback is set.
+ * Allocate filter stages and delay lines at init time.
+ */
+int src_init_stages(struct processing_module *mod)
+{
+	struct comp_data *cd = module_get_private_data(mod);
+	struct comp_dev *dev = mod->dev;
+	int ret;
+
+	ret = cd->setup_stages(mod);
+	if (ret < 0)
+		return ret;
+
+	/* For DP modules, dev->period is not yet set at init time (it's
+	 * computed in src_set_params at prepare). Derive it here from the
+	 * IPC config's output buffer size so that delay line allocation
+	 * uses correct buffer sizes.
+	 */
+	if (dev->ipc_config.proc_domain == COMP_PROCESSING_DOMAIN_DP && !dev->frames) {
+		uint32_t frame_bytes = cd->channels_count * cd->sample_container_bytes;
+
+		if (frame_bytes && cd->sink_rate) {
+			dev->period = 1000000ULL *
+				(cd->ipc_config.base.obs / frame_bytes) /
+				cd->sink_rate;
+			dev->period /= LL_TIMER_PERIOD_US;
+			dev->period *= LL_TIMER_PERIOD_US;
+			component_set_nearest_period_frames(dev, cd->sink_rate);
+		}
+	}
+
+	return src_allocate_delay_lines(mod);
+}
+
+/* At prepare time just verify rates and set downstream params */
+int src_prepare_do(struct processing_module *mod,
+		   struct sof_source *source, struct sof_sink *sink)
+{
+	struct comp_data *cd = module_get_private_data(mod);
+	struct comp_dev *dev = mod->dev;
+	int ret;
+
+	if (cd->source_rate != cd->ipc_config.base.audio_fmt.sampling_frequency ||
+	    cd->sink_rate != cd->ipc_config.sink_rate) {
+		comp_err(mod->dev, "rate mismatch: source %u/%u sink %u/%u",
+			 cd->source_rate,
+			 cd->ipc_config.base.audio_fmt.sampling_frequency,
+			 cd->sink_rate, cd->ipc_config.sink_rate);
+		return -EINVAL;
+	}
+
+	ret = src_set_params(mod, sink);
+	if (ret < 0) {
+		comp_err(mod->dev, "set params failed.");
+		return ret;
+	}
+
+	/* Update frame counts with final dev->frames from src_set_params */
+	cd->source_frames = dev->frames * cd->source_rate / cd->sink_rate;
+	cd->sink_frames = dev->frames;
+
+	return src_prepare_general(mod, source, sink);
+}
+
diff --git a/src/audio/src/src_lite.c b/src/audio/src/src_lite.c
index 9d5593ff34ca..89d205fc7b85 100644
--- a/src/audio/src/src_lite.c
+++ b/src/audio/src/src_lite.c
@@ -14,24 +14,16 @@
 
 LOG_MODULE_REGISTER(src_lite, CONFIG_SOF_LOG_LEVEL);
 
-/*
- * This function is 100% identical to src_prepare(), but it's
- * assigning different coefficient arrays because it's including
- * different headers.
+/* Set rate table pointers, compute rate indices, and copy filter stages.
+ * Must be in src_lite.c because src_table1/2, src_in_fs, etc. come from
+ * the coefficient headers included by this file.
  */
-static int src_lite_prepare(struct processing_module *mod,
-			    struct sof_source **sources, int num_of_sources,
-			    struct sof_sink **sinks, int num_of_sinks)
+static int src_lite_setup_stages(struct processing_module *mod)
 {
 	struct comp_data *cd = module_get_private_data(mod);
 	struct src_param *a = &cd->param;
 	int ret;
 
-	comp_info(mod->dev, "entry");
-
-	if (num_of_sources != 1 || num_of_sinks != 1)
-		return -EINVAL;
-
 	a->in_fs = src_in_fs;
 	a->out_fs = src_out_fs;
 	a->num_in_fs = NUM_IN_FS;
@@ -43,21 +35,42 @@ static int src_lite_prepare(struct processing_module *mod,
 	if (ret < 0)
 		return ret;
 
-	ret = src_allocate_copy_stages(mod, a,
-				       src_table1[a->idx_out][a->idx_in],
-				       src_table2[a->idx_out][a->idx_in]);
-	if (ret < 0)
-		return ret;
+	return src_allocate_copy_stages(mod, a,
+					src_table1[a->idx_out][a->idx_in],
+					src_table2[a->idx_out][a->idx_in]);
+}
+
+static int src_lite_do_init(struct processing_module *mod)
+{
+	struct comp_data *cd;
+	int ret;
 
-	ret = src_params_general(mod, sources[0], sinks[0]);
+	ret = src_init(mod);
 	if (ret < 0)
 		return ret;
 
-	return src_prepare_general(mod, sources[0], sinks[0]);
+	cd = module_get_private_data(mod);
+	cd->setup_stages = src_lite_setup_stages;
+
+	return src_init_stages(mod);
+}
+
+static int src_lite_prepare(struct processing_module *mod,
+			    struct sof_source **sources, int num_of_sources,
+			    struct sof_sink **sinks, int num_of_sinks)
+{
+	comp_info(mod->dev, "entry");
+
+	if (num_of_sources != 1 || num_of_sinks != 1)
+		return -EINVAL;
+
+	src_get_source_sink_params(mod->dev, sources[0], sinks[0]);
+
+	return src_prepare_do(mod, sources[0], sinks[0]);
 }
 
 const struct module_interface src_lite_interface = {
-	.init = src_init,
+	.init = src_lite_do_init,
 	.prepare = src_lite_prepare,
 	.process = src_process,
 	.is_ready_to_process = src_is_ready_to_process,