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Using Krell rca & bal outputs for the same channel

Why would I do that?
My sub has a highpass filter above 65hz. The dedicated sub channel can have info above that. So how can I get the missing freqs above 65hz. I can get a second sub but I’d rather not.
Since Krell’s RCA & balanced outputs are active at the same time, I can send the sub channel to another speaker using a Y cable to get the missing info. I’m thinking if I must use a Y cable and overtax a speaker with sub info, I’d send it to a rear speaker.
Does anyone know if using both outputs will affect the sound? The manual says that both outputs are active but to connect using only one. Will there be impedance issues? I also have an Audyssey EQ between the PrePro and the amp, so I would use the Y cable from sub and one of the rear to the EQ’s rear channel which will turn the analog signal into digital for EQing and back to analog for the amp.
captaincapitalism
captaincapitalism OP
52 posts
 
What does the subs cutoff have to do with your main speakers/rear?
My main goal is to get my missing freqs between 66 - 125hz.

Dolby Digital's specs allow for freqs up to 125hz in the dedicated LFE channel. If my sub cuts off freqs between 66 and 125hz, I will never get that information.
If I send the sub signal to another speaker I will get my missing freqs. I'm just trying to figure out how to send the LFE to another channel so I can get the missing freqs.
rcprince
3,070 posts
 
I doubt they're missing, aren't they coming through your main speakers? You would certainly notice that big a gap in frequencies in any musical content. Just because there is an upper cutoff for the LFE channel doesn't mean that the output to the main LR channels has a low cutoff at that frequency.

This, of course, should be taken with a grain of salt, as I have an HT system, but don't really know how it works as a technical matter. But I hear plenty of lower frequency info from my main speakers on movies.
dave_b's avatar
dave_b
3,159 posts
 
Rcprince has it correct. Remember, a subwoofer is just that...a SUB woofer i.e..below normal bass frequencies.
captaincapitalism OP
52 posts
 
In music this is not an issue. The lfe does not get information above the crossover. My system crossover is 60hz.
However, if my processor doesn't create the LFE output like in music and if the LFE comes from an independent source other then existing channels then all bets are off. No 2+ channel PrePro in existence applies crossovers to the dedicated LFE channel.

In other words: Crossovers do not apply to the .1 channel.

If that is the case, then my sub gets the entire LFE channel. But my sub nitpicks on LFE freqs. This issue applies to any source that has a dedicated LFE.

Anyway, I am researching if Dolby and DTS mirrors the LFE in other channels. Since other channels also go down to 3hz, it would make sense that they would use LFE just for effects even though it is the other channels.
But I will be limited if someone has info in the LFE and no where else.
rwwear
2,867 posts
 
In my system, which is two channel, I use the RCA outs from my preamp to the sub. The sub's low pass filter is set at 50Hz. I use the balanced outs for my main speakers and they run full range. This works very well and there is no crossover to muck up the sound of my mains.
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