Patrick_T
Agent
- Joined
- Dec 14, 2001
- Messages
- 39
Ok,
I've done some searching but I am not quite clear on a point or two about subwoofer calibration. Ok, the first thing I don't quite get concerns subwoofer and LFE channel trim controls. Now, depending on what documentation I read they reference changing the sub trim controls or the LFE trim controls. Are these controls one and the same, or do some processors allow you to adjust both? Below is some test I cut from the svs manual for the CS series subs.
Quote starts here:
Finally, ensure your subwoofer amp's volume control (if it has one) is set full up, to start. It's a good idea to check the separate subwoofer level control of your sur-
round receiver before you begin the test tones too. Keep it to no higher than -5 dB initially (that's one fourth up on a typical receiver channel limits of -10 dB to +10 dB) . Your LFE trim, if you have one, should be set to 0dB to start too. As the tones start, alternating from speaker to speaker (watching your sound meter
now) set each speaker's volume to about 75 dB, using the receiver's channel controls (leaving master volume the same). We recommend you turn down the receiverís subwoofer level, before you lower your
amp's volume control to keep input distortion to a minimum
End Quote:
So, they reference both a sub trim and a LFE trim. I am looking at getting the outlaw 1050 receiver and I have only seen reference to a sub trim, not a LFE trim. What if anything is the difference?
Next, say I adjust all my speakers to reference level using AVIA. Now, say my center is +2 on my trim controls and my surrounds are +1 on the trim controls. Does this change how much bass is sent to the subwoofer or do the trim controls effect the amplifier section and not the line level being fed to the sub output? The reason I ask is that it seems that if adjusting the trim levels of various channels effected the amount of bass level sent to the sub out for that channel then when you run the AVIA test you would get varying sub level outputs depending on which channel is being listened to.
I hope someone understand anything I wrote, sometimes putting confusion to words just doesn't work. Thanks in advance.
Patrick
I've done some searching but I am not quite clear on a point or two about subwoofer calibration. Ok, the first thing I don't quite get concerns subwoofer and LFE channel trim controls. Now, depending on what documentation I read they reference changing the sub trim controls or the LFE trim controls. Are these controls one and the same, or do some processors allow you to adjust both? Below is some test I cut from the svs manual for the CS series subs.
Quote starts here:
Finally, ensure your subwoofer amp's volume control (if it has one) is set full up, to start. It's a good idea to check the separate subwoofer level control of your sur-
round receiver before you begin the test tones too. Keep it to no higher than -5 dB initially (that's one fourth up on a typical receiver channel limits of -10 dB to +10 dB) . Your LFE trim, if you have one, should be set to 0dB to start too. As the tones start, alternating from speaker to speaker (watching your sound meter
now) set each speaker's volume to about 75 dB, using the receiver's channel controls (leaving master volume the same). We recommend you turn down the receiverís subwoofer level, before you lower your
amp's volume control to keep input distortion to a minimum
End Quote:
So, they reference both a sub trim and a LFE trim. I am looking at getting the outlaw 1050 receiver and I have only seen reference to a sub trim, not a LFE trim. What if anything is the difference?
Next, say I adjust all my speakers to reference level using AVIA. Now, say my center is +2 on my trim controls and my surrounds are +1 on the trim controls. Does this change how much bass is sent to the subwoofer or do the trim controls effect the amplifier section and not the line level being fed to the sub output? The reason I ask is that it seems that if adjusting the trim levels of various channels effected the amount of bass level sent to the sub out for that channel then when you run the AVIA test you would get varying sub level outputs depending on which channel is being listened to.
I hope someone understand anything I wrote, sometimes putting confusion to words just doesn't work. Thanks in advance.
Patrick