diff --git a/core/src/mindustry/content/Blocks.java b/core/src/mindustry/content/Blocks.java
index b15d24ae7a..b783221cbc 100644
--- a/core/src/mindustry/content/Blocks.java
+++ b/core/src/mindustry/content/Blocks.java
@@ -509,6 +509,8 @@ public class Blocks implements ContentList{
             hasPower = true;
             hasLiquids = false;
             drawer = new DrawSmelter(Color.valueOf("ffef99"));
+            ambientSound = Sounds.smelter;
+            ambientSoundVolume = 0.07f;
 
             consumes.items(with(Items.coal, 1, Items.sand, 2));
             consumes.power(0.50f);
@@ -525,6 +527,8 @@ public class Blocks implements ContentList{
             itemCapacity = 30;
             boostScale = 0.15f;
             drawer = new DrawSmelter(Color.valueOf("ffef99"));
+            ambientSound = Sounds.smelter;
+            ambientSoundVolume = 0.07f;
 
             consumes.items(with(Items.coal, 4, Items.sand, 6, Items.pyratite, 1));
             consumes.power(4f);
@@ -538,6 +542,8 @@ public class Blocks implements ContentList{
             size = 2;
             hasPower = hasItems = true;
             drawer = new DrawSmelter(Color.valueOf("ffc099"));
+            ambientSound = Sounds.smelter;
+            ambientSoundVolume = 0.07f;
 
             consumes.items(with(Items.lead, 1, Items.sand, 1));
             consumes.power(0.60f);
diff --git a/core/src/mindustry/maps/filters/SpawnPathFilter.java b/core/src/mindustry/maps/filters/SpawnPathFilter.java
index 09d453e513..0495baa839 100644
--- a/core/src/mindustry/maps/filters/SpawnPathFilter.java
+++ b/core/src/mindustry/maps/filters/SpawnPathFilter.java
@@ -31,7 +31,7 @@ public class SpawnPathFilter extends GenerateFilter{
 
     @Override
     public void apply(Tiles tiles, GenerateInput in){
-        Tile core = null;
+        var cores = new Seq<Tile>();
         var spawns = new Seq<Tile>();
 
         for(Tile tile : tiles){
@@ -39,11 +39,11 @@ public class SpawnPathFilter extends GenerateFilter{
                 spawns.add(tile);
             }
             if(tile.block() instanceof CoreBlock && tile.team() != Vars.state.rules.waveTeam){
-                core = tile;
+                cores.add(tile);
             }
         }
 
-        if(core != null && spawns.any()){
+        for(var core : cores){
             for(var spawn : spawns){
                 var path = Astar.pathfind(core.x, core.y, spawn.x, spawn.y, t -> t.solid() ? 100 : 1, Astar.manhattan, tile -> !tile.floor().isDeep());
                 for(var tile : path){