diff --git a/pcsx2/SPU2/Reverb.cpp b/pcsx2/SPU2/Reverb.cpp
index e631e40bec..bee1340b01 100644
--- a/pcsx2/SPU2/Reverb.cpp
+++ b/pcsx2/SPU2/Reverb.cpp
@@ -92,7 +92,7 @@ static constexpr std::array<s32, NUM_TAPS> filter_coefs = {
 	-1,
 };
 
-s32 V_Core::ReverbDownsample(bool right)
+s32 __forceinline V_Core::ReverbDownsample(bool right)
 {
 	s32 out = 0;
 
@@ -108,9 +108,25 @@ s32 V_Core::ReverbDownsample(bool right)
 }
 
 
-s32 V_Core::ReverbUpsample()
+StereoOut32 __forceinline V_Core::ReverbUpsample()
 {
-	return 0;
+	s32 ls = 0, rs = 0;
+
+	for (u32 i = 0; i < NUM_TAPS; i++)
+	{
+		ls += RevbUpBuf[0][((RevbSampleBufPos - NUM_TAPS) + i) & 63] * filter_coefs[i];
+	}
+	for (u32 i = 0; i < NUM_TAPS; i++)
+	{
+		rs += RevbUpBuf[1][((RevbSampleBufPos - NUM_TAPS) + i) & 63] * filter_coefs[i];
+	}
+
+	ls >>= 14;
+	Clampify(ls, INT16_MIN, INT16_MAX);
+	rs >>= 14;
+	Clampify(rs, INT16_MIN, INT16_MAX);
+
+	return StereoOut32(ls, rs);
 }
 
 /////////////////////////////////////////////////////////////////////////////////////////
@@ -122,8 +138,6 @@ StereoOut32 V_Core::DoReverb(const StereoOut32& Input)
 		return StereoOut32::Empty;
 	}
 
-	RevbSampleBufPos++;
-
 	RevbDownBuf[0][RevbSampleBufPos & 63] = Input.Left;
 	RevbDownBuf[1][RevbSampleBufPos & 63] = Input.Right;
 
@@ -205,7 +219,10 @@ StereoOut32 V_Core::DoReverb(const StereoOut32& Input)
 		_spu2mem[apf2_dst] = clamp_mix(apf2);
 	}
 
-	(R ? LastEffect.Right : LastEffect.Left) = -clamp_mix(out);
+	RevbUpBuf[0][RevbSampleBufPos & 63] = R ? 0 : clamp_mix(out);
+	RevbUpBuf[1][RevbSampleBufPos & 63] = R ? clamp_mix(out) : 0;
 
-	return LastEffect;
+	RevbSampleBufPos++;
+
+	return ReverbUpsample();
 }
diff --git a/pcsx2/SPU2/defs.h b/pcsx2/SPU2/defs.h
index d969174d1c..dfdc19b993 100644
--- a/pcsx2/SPU2/defs.h
+++ b/pcsx2/SPU2/defs.h
@@ -497,7 +497,7 @@ struct V_Core
 	s32 RevbGetIndexer(s32 offset);
 
 	s32 ReverbDownsample(bool right);
-	s32 ReverbUpsample();
+	StereoOut32 ReverbUpsample();
 
 	StereoOut32 ReadInput();
 	StereoOut32 ReadInput_HiFi();