Bypass fixed x-over

RyanJE · 01-29-2005, 06:07 PM

Anyone know how to bypass a fixed X-over in a receiver? My sub has a highpass set at 100hz. Can I-Should I parallel?

RyanJE · 01-30-2005, 11:58 AM

bump.. Anyone!!

I have tower speakers and hate to waste their capabilities.

RyanJE · 01-30-2005, 04:48 PM

Yall scared??

Brian Fellmeth · 01-31-2005, 12:30 PM

If your receiver lets you set the mains to "large", then that will bypass the receiver's crossover.

John S · 01-31-2005, 12:54 PM

Hmm, confusing post a little...

You state you sub has xover at 100hz, you state your avr has a fixed xover setting.

Then you ask about parallel like you are using the speaker connections to your sub.

Before attempting the parallel thing, I would make sure it is cool on your sub to not have speakers connected to it, but using the speaker connection to it. If that makes sense. If so, this should be ok to do. Connection like that you AVR should be set, that there is no sub in the system at all, that way all sub bass and LFE should come out the speakers.

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RyanJE · 01-31-2005, 02:41 PM

Jon,
I currently have my sub hooked up via LFE out from the receiver. It has a fixed filter at 100 hz. There are no speaker level outputs on my receiver just the single cable out im using. There are no speaker outs on my sub either. I want to cross my sub over around 60-70 hz but I cant when using the LFE out because its fixed at 100hz. So are there any potential problems with parallel. Will it break anything?

Brian
How will that work? Will my sub still play everything below 100hz along with my towers? I was under the impression that if I use the sub out on my receiver it sends everything below 100hz to my sub. If I do what your saying, will the receiver send LFE to the mains down to 60hz and then below 60hz to my sub..assuming I x-over my sub at 60hz?

John Garcia · 01-31-2005, 03:24 PM

With your mains set to SMALL, your sub is fed everything below 100Hz.

With your mains set to LARGE, your sub will be fed LFE + bass below 100hz from any other speakers set to small. (LFE and BASS are not the same thing)

By speaker level outs, John S means the MAIN speaker level outputs, which would feed your sub a full range signal and would allow you to use your sub's x-over. Then, you have to either run your mains full range off the main speaker outs or run them in-line with the sub. Running them in-line with the sub will defeat the goal you are trying to achive however, because they will again be filtered by the sub, most likely at a fixed point of 80-120Hz (most sub's speaker level outs are not variable). You will get the desired lower x-over, but the signal will not be as good as using it the way you have it hooked up already. Just set your mains to large and leave it the way you have it.

If your mains aren't good to about 35Hz, then using a 60hz x-over may not be a good thing.

RyanJE · 01-31-2005, 05:43 PM

My mains are good to 42hz and are currently set to small. Your saying set them to large. Also, I have no speaker level out on my avr. I only have the sub cable output. If I set them to large will my receivers fixed x-over be negated?? If so, I could then set my sub to 70hz.

I understand that LFE is an extension of bass usually 10dbs louder since we are not as sensitive to low frequencies. For the record Im concerned with movies not music. I don't listen to music on my system much.

Also I said my sub has a fixed high pass filter of 100hz. This differs from a cross over. Which doesnt matter anyway because my sub has no speaker level outs.

John S · 01-31-2005, 06:13 PM

Your sub has no speaker level in's and out's????
Make and model please?

If you set your fronts to large, the only thing that will come out of the sub is the lfe information. Some AVR's have the option for fronts and sub "both" for bass and LFE. LFE usually only has particular low end sound effects.

Can you describe what you meant as running parallel in your first post???

I just assumed you meant, L/R speaker outs to your speaker with a parllel connection to the sub speaker inputs, not going from your subs speaker outputs to the speaker if that makes sense.

John Garcia · 01-31-2005, 06:19 PM

Quote:

Also, I have no speaker level out on my avr.

If your speakers are driven by your receiver, these ARE your speaker level outputs - that would be used for "parallel" hookup you are talking about.

If your sub has no speaker level outs, then setting your mains to small and lowering your sub's x-over will result in a dip or gap about the midpoint between the receiver's x-over and your sub's x-over. If you run your mains as large in parallel, you will get double bass, with the sub and mains reproducing the same information at the same time, and this is not always a good thing because you may get cancellation of standing waves at certain frequencies, depending on your room and speaker locations.

LFE is a separate track and is present basically only on movies. I'm not sure if the .1 track for multichannel DVD-A/SACD/DTS CDs is considered true LFE or not, but it is a separate channel. The only way to completely turn off the receiver's x-over is to set all speakers to large. With your mains only set to large, the bass from any other speakers set to small will still be redirected to the sub at the fixed x-over.

A response of 42Hz and a 100Hz x-over should work fine with your mains set to small, though an 80Hz x-over would probably work better. Your speakers will still potentially be recieving sound to about 50Hz, as a x-over is not an all-or-nothing sort of thing. I've used both 80 and 100, and I have to say it isn't a HUGE difference, but I prefer 80hz. I'd try it with them set to large and small and see which way sounds better to you.

Is there something with your setup that you don't like that prompted the question? Have you calibrated with an SPL meter and test tones?

RyanJE · 01-31-2005, 06:49 PM

Right, I meant no speaker level outs for a sub.. sorry. And my sub has speaker level in but not out. I have calibrated with an spl meter. What I dont like is that I have tower speakers that I set to small when they are bass capable. Also frequencies above 70-80 hz are localized and im trying to avoid that, as it is noticeable in my room.

Quote:

A response of 42Hz and a 100Hz x-over should work fine with your mains set to small, though an 80Hz x-over would probably work better

This is what I want but cant seem to achieve because my avr's x-over is fixed at 100hz. How exactly can I do this??

P.S. My sub is a JBL E250p.