Which is better speaker level or line level input to sub? - Home Theater Forum and Systems - HomeTheaterShack.com

 
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post #1 of 10 Old 02-04-08, 11:15 PM Thread Starter
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Which is better speaker level or line level input to sub?

My sub is a 150w VTF-2 Hsu Research with line level and speaker level inputs with variable crossover from 60~90hz with phase switch and crossover in/out switch. Now im using the speaker level input with sub setting in AVR at "no sub" to allow low freq to pass to mains L/R and bass response is good. Have tried the line level using Y connector from sub out of AVR and line level L/R in of sub but bass response not so good..any suggestions?
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post #2 of 10 Old 02-05-08, 01:19 AM
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Re: Which is better speaker level or line level input to sub?

Use the former rather than the later.
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post #3 of 10 Old 02-05-08, 08:45 AM
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Re: Which is better speaker level or line level input to sub?

Normally it is best to use the LFE (sub) output of the AVR. It is line level and misses the additional hum and distortion of the power amplifier stage. Your AVR should have a setting to use the sub and therefore pass the LFE plus frequencies below the bass management crossover freq (normally 80 Hz) to the sub. The mains should get the frequencies above the crossover.

If the AVR does not have a line level LFE output then it is not really an AVR in my opinion.
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post #4 of 10 Old 02-05-08, 10:09 AM
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Re: Which is better speaker level or line level input to sub?

The above posters are correct. By using the LFE line out from the receiver you get the proper mix that the AVR will decode from Dolby Digital, DTS and other surround formats.

Home theater:
Onkyo 805, Yamaha YDP2006EQ, Samson Servo 600 amp
3 EV Sentry 500 monitors across the front, 4 Mission 762i's Surrounds, SVS PB13U sub, Panasonic BDT220, Harmony 1100, Nintendo WiiU
Panasonic PT-AE8000 on a 120" 2,35:1 fixed screen

Living room system:
Sherwood/Newcastle R972, Mission 765's, SVS SBS02's, A/D/S MS3u sub, Yamaha YDG2030EQ
Yamaha KX-393 Tape deck, CDC 805 CD changer, Panasonic BD60, Sony turntable PS-T20
Panasonic TC-P50ST60, HD-PVR & WDTV Live, Harmony 900

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post #5 of 10 Old 02-05-08, 11:08 AM
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Re: Which is better speaker level or line level input to sub?

It is always better to use the line level inputs not the speaker level inputs. If I remember anything from a time I tried it, I found the distortion on higher volumes too much to deal with, and you also won't get the information for LFE channel like you should for movies.
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post #6 of 10 Old 02-05-08, 06:08 PM
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Re: Which is better speaker level or line level input to sub?

Quote:
rentangz wrote: View Post
.... Have tried the line level using Y connector from sub out of AVR and line level L/R in of sub but bass response not so good..any suggestions?
If you use this connection, you won't hear the sub all the time ... if your bass response was not good, maybe it was because the volume was to low, the crossover was not set right, the level on your AVR was to low or the signal (CD, DVD, etc.) didn't have enough bass

I have my sub connected thru the line level, response is good ... but sometimes I feel there is not enough bass, and that's because the movie doesn't have a lot of bass.

I suggest you to use a movie with a lot of bass (Transformers, War of The Worlds, Master and Commander, U571, etc.), calibrate your system and try both ways and see which one you like ...
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post #7 of 10 Old 02-05-08, 07:18 PM
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Re: Which is better speaker level or line level input to sub?

Quote:
rentangz wrote: View Post
My sub is a 150w VTF-2 Hsu Research with line level and speaker level inputs with variable crossover from 60~90hz with phase switch and crossover in/out switch. Now im using the speaker level input with sub setting in AVR at "no sub" to allow low freq to pass to mains L/R and bass response is good. Have tried the line level using Y connector from sub out of AVR and line level L/R in of sub but bass response not so good..any suggestions?
Why are you not using the crossover in the AVR and the line level output for the sub?
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post #8 of 10 Old 02-06-08, 02:32 AM Thread Starter
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Re: Which is better speaker level or line level input to sub?

Quote:
salvasol wrote: View Post
If you use this connection, you won't hear the sub all the time ... if your bass response was not good, maybe it was because the volume was to low, the crossover was not set right, the level on your AVR was to low or the signal (CD, DVD, etc.) didn't have enough bass

I have my sub connected thru the line level, response is good ... but sometimes I feel there is not enough bass, and that's because the movie doesn't have a lot of bass.

I suggest you to use a movie with a lot of bass (Transformers, War of The Worlds, Master and Commander, U571, etc.), calibrate your system and try both ways and see which one you like ...
Yeah I agree with your opinion and observation..this is what I thought when I tried using the line level and used the LFE out of my AVR..Presently I am using the speaker level but I will try again the line level using my new 684 that can handle the low freq compared to my smaller DM302. I will adjust the crossover of the AVR for good bass response but most likely the bass will be coming from the mains speaker and seldom from the sub...except for movies with lots of LFE signal. With the sub connected to LFE, I will not be hearing deep bass from the sub when playing music sources since LFE is likely absent on this..Anyway thanks guys..I will experiment on this..
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post #9 of 10 Old 02-06-08, 02:35 AM Thread Starter
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Re: Which is better speaker level or line level input to sub?

Quote:
Kal Rubinson wrote: View Post
Why are you not using the crossover in the AVR and the line level output for the sub?
I will try this setup Kal and will give you my feedback. Have tried this before but using my smaller DM302 as mains L/R.
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post #10 of 10 Old 02-06-08, 02:39 AM Thread Starter
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Re: Which is better speaker level or line level input to sub?

Quote:
Rambo4 wrote: View Post
It is always better to use the line level inputs not the speaker level inputs. If I remember anything from a time I tried it, I found the distortion on higher volumes too much to deal with, and you also won't get the information for LFE channel like you should for movies.
Yeah thanks George...will try the line level input..will post my feedback
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