Is there any PC based software to crossover the L & R channels to the sub? - Page 2 - diyAudio
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Old 24th November 2011, 09:28 AM   #11
diyAudio Member
Join Date: Nov 2011
Hi Spot,

I've built some new amps and a problem has just come up with AC3 filter and its to do with bass redirection levels. When you are using a stereo input and use bass redirection to the sub, there is no way to adjust the level of the redirected bass. The subs level control only works when the input is a separate LFE channel. This has occured because of different amplifiers for the sub in relation to the other channels and the sub is far too loud. There are two work arounds for this:-

1) With the bass redirection box ticked, add some of the front channels (inverted) to the sub channels. I use -0.5L and -0.5R.

2) Add a line level control (potentiometer) to the input of the sub amp and adjust for the correct level with redirected bass. Adjust the levels of the bass within AC3 on 5.1 inputs when redirected bass is off.

AC3 allows you to save your speaker settings, so I now call up the one required for whether the input is stereo or 5.1. Hope this helps in your setup.


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Old 29th November 2011, 11:46 AM   #12
diyAudio Member
Join Date: Apr 2010
On a PC speaker (5.1 ch) like Logitech X540 is not possible because his pre'amp construction is wierd,the speakers gets signal from front L&R input not from SUB input,and LFE crossover has no efect on sub speaker.Also bass-redirection is wierd.
I have X-Fi Titanium Fat. Pro. and Xonar D1 audio card and act exactly the same,they have (booth card) bass redirection option,LFE freq. cutoff by driver software. Real AV Recivers (multichannels) are no dificulties with setings for sub.
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