From 23f2f73c63fab846435a698797a0d9041dc63722 Mon Sep 17 00:00:00 2001
From: Carl Hetherington <cth@carlh.net>
Date: Fri, 18 Sep 2015 22:31:41 +0100
Subject: Fix incorrect gain of L+R; it's dB not linear.

---
 src/lib/upmixer_a.cc | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'src/lib')

diff --git a/src/lib/upmixer_a.cc b/src/lib/upmixer_a.cc
index a5850cf94..0479f16b2 100644
--- a/src/lib/upmixer_a.cc
+++ b/src/lib/upmixer_a.cc
@@ -71,10 +71,10 @@ UpmixerA::run (shared_ptr<const AudioBuffers> in, int channels)
 	shared_ptr<AudioBuffers> in_L = in->channel (0);
 	shared_ptr<AudioBuffers> in_R = in->channel (1);
 
-	/* Mix of L and R */
+	/* Mix of L and R; -6dB down in amplitude (3dB in terms of power) */
 	shared_ptr<AudioBuffers> in_LR = in_L->clone ();
 	in_LR->accumulate_frames (in_R.get(), 0, 0, in_R->frames ());
-	in_LR->apply_gain (0.5);
+	in_LR->apply_gain (-6);
 
 	/* Run filters */
 	vector<shared_ptr<AudioBuffers> > all_out;
-- 
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