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Discussion Starter · #1 ·
I was told that if I were to use a non-THX sub that whenever I decrease the volume below reference (0 db), which is quite possibly quite often, that the only way to adjust the output of the subwoofer is to use the sub's volume knob on the sub itself, as oppose to using a THX sub, in which case when one lowers the overall volume on the pre/pro or receiver, the THX sub's volume decreases accordingly.


I am wondering if this is indeed true or is it untrue and based on THX marketing hype?


i thought that using any sub with a pre/pro/receiver would allow for proper volume adjustment (including adjusting the sub's volume) whenever one were to decrease the master volume on the pre/pro/receiver.


however, since i was told otherwise, that unless it is a THX sub, adjusting the volume down on the pre/pro/receiver would simply lower the volume of everything EXCEPT the output volume of the subwoofer, so it woun't work properly unless were to be willing/able to reduce the sub's volume appropriately by actually going to the sub itself and adjusting the output volume knob each time one were to go below reference (0 db).


am i totally confused? don't understand this bass management part for 5.1 systems on THX vs no THX.


Thanks.
 

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You were told wrong.


THX or no THX, with a Dolby Digital or DTS 5.1 system, the output of the sub is determined by the gain of the preamp out for the sub which is controlled by the master volume. You set the gain on the sub 1 time when you set it up and the volume goes up and down depending on where you have the overall volume at.


Sorny
 

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THX and non THX components can be used together.. :cool:

Key point of THX is that when U are using ALL THX components (electronics, sub, speakers) then they are dialed in to match their standards. One major specification of THX is that they specify the Low Pass Filter to be set @ 80 HZ, this why whenever U are in THX DSP mode only 80Hz is possible. But since THX is now controlled by Sound Blaster they don't seems to have the same influence over the higher end home theater biz as they did a few years ago. The THX standards has some good sides to it but now that the DVD media is much improved its sonic contribution is more marginal.. :cool:
 
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