Official Rythmik Audio Subwoofer thread - Page 543 - AVS Forum
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post #16261 of 16270 Old Yesterday, 09:02 PM
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Originally Posted by DonH50 View Post
Line in adds another gain stage for the filter and thus increases the noise slightly. I cannot hear any difference at my LP but I suppose you might if you stick your ear at the sub...
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Originally Posted by Rythmik View Post
Noise and distortion are also affected by bandwidth. The noise can come in at active devices (like OP amps), passive devices (like resistors with thermal noise), and even interconnect. Distortion is mainly generated by active devices. All of these are used in AVR, subwoofer, and the interconnect between them. So having a wider bandwidth on the subwoofer may not be a good thing.
There is a conflict in this matter. I read Brian's comment as LFE input is not as good as line in. The question I had was if line in was used with a sub 80hz crossover, what happens to 81-120hz from the LFE channel from a movie sound track? Am I losing those frequency content? I assume yes?
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post #16262 of 16270 Old Today, 05:16 AM
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This is what I would assume too based on Rythmik's website. Non issue for me because I use LFE.

Frequency Response 14 - 200 Hz (-2 dB @ 17 Hz, -6db@14hz) with LFE inputs 14 - 90 Hz ((-2 dB @ 17 Hz, -6db@14hz) with LINE IN inputs
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post #16263 of 16270 Old Today, 05:27 AM
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Whether LFE is better than line in or the other way around depends upon the AVR and overall SINAD (signal to noise and distortion) performance of the chain. Without a lot more knowledge it is impossible to say which is better in any given case. IMO it does not really matter but as Brian says try both and see which you like.

The LFE bandwidth also depends upon the AVR's setting. In practice I am not sure there is much LFE content above 80 Hz; anecdotal evidence from various posts on this site lead me to suspect not much. My very brief trials a few years ago indicated that, for me, rolling off the LFE above 80 Hz did not change the sound noticeably (i.e. I did not notice the change on the few scenes I checked). But, I do not know. If the AVR sends all LFE bandwidth to the subwoofer channel and you roll it off in the sub, then yes that half-octave is lost (note that it will be rolled off over 80 Hz, it does not get chopped off right at 80 Hz). If the AVR is set to roll off the sub at 80 Hz, it depends upon how the AVR handles the LFE content. Again without direct measurements of my own, what little research I have done and reading here on AVS seems to indicate some AVRs redirect the LFE (along with other bass content) above the crossover to the L/R speakers, while other do simply roll it off. Again I do not know for sure. Almost all the diagrams I could find all showed LFE going only to the subwoofer and not to the mains. Some AVRs use a global low-pass setting that rolls off the LFE channel along with the mains; others use a separate LPF for the LFE signal.

As I said, for me the difference between line in and LFE in was not noticeable so, if you are concerned about the higher-frequency LFE content, use the LFE input. Better yet try them both and report what you find. I'd be curious if your findings are the same as mine; I honestly do not know what others might find.

"After silence, that which best expresses the inexpressible, is music" - Aldous Huxley
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post #16264 of 16270 Old Today, 08:03 AM
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Quote:
Originally Posted by tvuong View Post
There is a conflict in this matter. I read Brian's comment as LFE input is not as good as line in. The question I had was if line in was used with a sub 80hz crossover, what happens to 81-120hz from the LFE channel from a movie sound track? Am I losing those frequency content? I assume yes?

I know several members have mentioned this matter. But when I look at that, I immediately know it is the margin that engineers put in. Whenever possible, engineers always try to design in some margin. When you have a special effect (naturally recorded or synthesized), it will not have a natural bandwdith of 80hz or 120hz. So there needs to be a crossover done on these signals: signals below a particular frequency goes to LFE, the rest goes to other channels (so that we can differentiate if the explosion is from the front or from the back). If it is done correctly, the engineer will pick a crossover point below even say 80hz so that there will be enough frequency band for the response to roll-off (instead of cliff-like roll-off).

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post #16265 of 16270 Old Today, 04:00 PM
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when is the F25 due back in stock?

any changes when it is back?

sorry if this has been spoken to already I have not followed the thread.

Elwood P. Dowd: Years ago my mother used to say to me, she'd say, "In this world, Elwood, you must be" - she always called me Elwood - "In this world, Elwood, you must be oh so smart or oh so pleasant." Well, for years I was smart. I recommend pleasant. You may quote me.
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post #16266 of 16270 Old Today, 04:15 PM
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The F25 with dual DS1501 drivers and HX800XLR3 amp will be back in stock by mid August. Also we may bring the H550PEQ3 amp back as an option for the FV15HP.

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post #16267 of 16270 Old Today, 04:28 PM
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The F25 with dual DS1501 drivers and HX800XLR3 amp will be back in stock by mid August. Also we may bring the H550PEQ3 amp back as an option for the FV15HP.
what are the features and benefits of the H550PEQ3 amp if that were to be available as an option?

Elwood P. Dowd: Years ago my mother used to say to me, she'd say, "In this world, Elwood, you must be" - she always called me Elwood - "In this world, Elwood, you must be oh so smart or oh so pleasant." Well, for years I was smart. I recommend pleasant. You may quote me.
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post #16268 of 16270 Old Today, 04:37 PM
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Originally Posted by eljr View Post
what are the features and benefits of the H550PEQ3 amp if that were to be available as an option?
Benefits of the H550PEQ3 amp has been discussed in this thread in the past. Check on post #6640

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post #16269 of 16270 Old Today, 05:06 PM
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All the features of the 600, hair less money and a hair less power, but respectively more power supply filter capacitance. I'd choose it.

"After silence, that which best expresses the inexpressible, is music" - Aldous Huxley
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post #16270 of 16270 Old Today, 05:16 PM
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Originally Posted by enricoclaudio View Post
Benefits of the H550PEQ3 amp has been discussed in this thread in the past. Check on post #6640
thank you for the reply

are there any reviews of the f25 that you or anyone else can link me to?

Elwood P. Dowd: Years ago my mother used to say to me, she'd say, "In this world, Elwood, you must be" - she always called me Elwood - "In this world, Elwood, you must be oh so smart or oh so pleasant." Well, for years I was smart. I recommend pleasant. You may quote me.
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