| AudioREVIEW's Forum Archives - Home Theater |
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|   Crossover point question (last ? of the week, promise)... | Josh Studrawa
Jul 6, 2001 2:27 PM | | What's the deal with the magical 80hz crossover point?
I have mains that go down to 35Hz. Granted, they may not do the best work at 50-35, but shouldn't I be utilizing them closer to their lower limit than 80Hz? And wouldn't my sub be better off doing more of the "sub" work, say from 50Hz on down?
That said, I can set my crossover on my sub anywhere from 50 - 120Hz. Can I set my 1801 to cut my mains off at 50 or 60Hz?
Guess that was 2 questions, sorry. Just post me some links and I'll go off and read the rest of the day if ya want. |
| Liar You'll Be Back | Adam
Jul 6, 2001 2:40 PM | | THX I belive set the spec at 80hz, which is why most receivers have the x-over point at 80hz. The great thing about sony is they have adjustable x-over settings in increments of 10. The new denons will offer that as well.
You can't unfortunatley with you 1801 use flexible x-overs. The sub setting for x-over should be set 120. The LFE portion of a soundtrack can contain data up to 120hz, thus setting it lower would mean that you would lose out on all that. Setting speaker x-overs is independent of the Sub's physical x-over dial. Setting your speakers to small will REDIRECT and sound 80hz and below to the sub. The sub is now the handling the speakers frequency redirections as well as the LFE track, hence the need for a good sub. |
| Yeah, I prolly will. Now in fact... | Josh Studrawa
Jul 6, 2001 2:45 PM | | So I should set my sub to 120Hz?! That's going to overlap on music then when the mains run down to 80 and the sub runs up to 120.
Or use no sub for 2ch audio? |
| Yeah, I prolly will. Now in fact... | Adam
Jul 6, 2001 3:41 PM | | The Cd player has optical out if you are connecitng it via optical out and not using any DSPs the crossover will still hold true. Your mains wont play anything below 80, the sub will handle all of that. Tom V. from SVS told me the easiest way to get the subs physical x-over out of the way is to turn it all the way up and then have the receiver manage everything. You will be doing this by turning your sub up to 120 (the highest). Now if you connect the cd player via analog then it's a different story, you will basically get no bass management similar to the DVD-Audio problems. If you use the DIRECT soundifield on the Denon it by passes the x-over settings and plays the cd as it was intended, so they say. If you want to talk further you have my digits :) |
| Adam, I think you're wrong on the Sony.... | nick4433
Jul 6, 2001 3:47 PM | | I had the Sony 555ES (wonderful receiver) and the settings you refer to are actually individual EQ settings for Fronts combined, Center, and Rears combined. I do not think that adjusting the Bass for the front speakers in the given 100Hz to 1Khz range actually adjusts or changes the crossover with regards to the receivers LFE channel. No matter what EQ settings you have on the front (Bass) and if you have your speakers set to Small, then the crossover would remain at 80Hz.
I think if you selected 'NO' for subwoofer then the EQ settings for Bass really come handy. |
| Adam, I think you're wrong on the Sony.... | Adam
Jul 6, 2001 4:00 PM | | On the Sony ES line if you set speakers to small you can adjust the crossover in 10step increments from I believe 40hz to 120hz. I'm not referring to the EQ, I never mess with that. I remember I was so fascinated that I could set my fronts and rears to small and have them cross over at 60 and then have my center cross over at 70. The outlaw 1050 is the only other one I know of that can do it. Seems like you've been living the Denon 3801 life for too long :) take a spin over to a shop and check her out.... |
| Will check it soon and post (nt) | nick4433
Jul 6, 2001 4:06 PM | | |
| related question | george2
Jul 6, 2001 5:38 PM | | I have a similar question. I've been told to set the fronts to large and set the subs crossover to 50. Thus the fronts will overlap the sub, but the sub (given the slope of the cutoff) won't go above 80, at which point it becomes "directional". Do you disagree with that approach? And is Eyespy right? g |
| Hmmm...Someone want to jump in | Adam
Jul 6, 2001 9:46 PM | | I don't know if disagree is the right word. Depending on how good your sub is the rated bandwidth of your speakers multiple setups could work. I am a little confused as to why he would set the sub to 50hz since the LFE track carries information 120hz and below. Is this for DVD listening or for CD? |
| May be this link on "bass Managment" help. | Smokey
Jul 6, 2001 11:22 PM | | I don't know if you have seen this article or not but it is a great read.
http://www.polkaudio.com/home/faqad/advice.php?article=bassmanage |
| Strongly encourage you to read Smokey.s link........... | Debra
Jul 7, 2001 4:09 PM | | I know at least 20 people with decent audio systems and all have the sub hooked to the sub output. I would be willing to bet most people do.The article is interesting since most people can now experiment and see if they can get an improvement for free. For those with recent Yamaha receivers, it appears their's are designed to cut out at 90 when using the sub output. It looks like a sizeable number of people could profit from using the main speaker outputs.I do have one addl question for Smokey or anyone else that knows. When they speak of parallell wiring the fronts and sub from the L & R outputs, do they in fact mean inserting two wire ends in each output of the receiver and the L & R inputs of the sub? Would this not affect the impedance by cutting the ohms in half since the output would encounter two sets of speakers rated at 8 ohms? |
| Strongly encourage you to read Smokey's link........... | Smokey
Jul 8, 2001 9:32 AM | | Hi Debra
When an active Subwoofer is wired to L/R speakers as parallel set up, in actuality the sub's amplifier is in parallel with 8 ohm speaker. Probably the Sub's amp input is in 1000 ohms range or higher which will not effect the speaker as far as its relation to the receiver speaker output is concern.
If you have an 8 ohms load and 1000 ohms load in parallel, your total resistance in will be 7.9 ohms which is pretty close to 8 ohms, so the receiver will not be bother with it at all. Also the Sub will required very small watt from the receiver because Sub's internal amp will do most of the work.
If the sub is passive( non amplified) then you might run into problem because the Reciever not only have to pump power to the L/R speakers but also to sub which will put extreme strain on the receiver's amp. That is why passive sub is not recommend, but by now you probably knew that already.
I hope this helped. |
| Hmmm...Someone want to jump in | EyeHere
Jul 7, 2001 9:43 AM | | My understanding is that by setting the offboard crossover (x-30) to 50, given the slope, the sub won't get any signal above 80, so it doesn't become directional. thus, the floorstanders (studio 100's) and the sub (servo 15) overlap or blend at the bottom, with the floorstanders ceasing to be flat at around 35, such that the sub really does its work below that point. |
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