Subwoofer frequency + phase
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Bronze Member Username: LuxendelGondelsheim, Baden-Württe... Germany Post Number: 39 Registered: Oct-07 | Hi all! I wanted to ask about the setting of both the frequency and phase of the subwoofer. Right now the frequency is at 85 "somethinh with" Hz and the phase is at 180°. My speakers have the following specs: KeF iQ 7 iQ7 Three-Way Power Handling: 150 Watts Efficiency: 90 dB Frequency Response: 40 Hz - 40 kHz Nominal Impedance: 8 Ohms Dimensions: 8.7" H x 34" W x 12.9" As you can see, the sub is in a 180° line with the speakers. Should I increase the numbers above 85 or decrease... What happens when I increase the frequency? To my ears, its getting louder and more unclear... When I decrease, its getting less loud and finally only a hint is there. I feel that around 85-90 is good... Then I regulate with the volume knob. Which frequency would best fit to my speakers? Any advice??? Thank u Thorsten  |
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Platinum Member Username: Jan_b_vigneDallas, TX Post Number: 12167 Registered: May-04 | . I guess that's the sub in the center of the room. I would move it to one side or the other since center placement is typically not the best overall solution. Put "subwoofer placement" or "subwoofer set up" in a search engine and read a few articles and move things around. If the subwoofer is being controlled by a reciever with a LFE output, you should run the sub's crossover frequency at full boat as high as it goes which essentially removes it from the circuit. If the sub's crossover is your only filter, I would set the crossover frequency as low as possible and run the front speakers full range. Once you run the filter above 80Hz, the location of the sub becomes more obvious and more intrusive. Where the crossover settles is up to you, your speakers and your room. As long as the sub is in the same line as the speakers, set the phase control on the sub to 0°. Reverse the phase setting to 180° and listen for any improvement. If none can be heard, leave the sub on 0°. . |
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Bronze Member Username: LuxendelGondelsheim, Baden-Württe... Germany Post Number: 40 Registered: Oct-07 | Dear Jan, thank u for answering so nicely. "If the sub's crossover is your only filter,..." The Sub is plugged into the NAD C370 via pre-out 2. So, the frequency as low as possible, right? With the phase I will try and with the position of the sub too... Thank & Cheers Thorsten |
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Bronze Member Username: LuxendelGondelsheim, Baden-Württe... Germany Post Number: 41 Registered: Oct-07 | Hi! I changed the position of the sub towards the right corner...very big improvement!!!! PUNCHY!!!! Very strong and clear punch-bass...I had to turn the volume down pretty much. Corner effect?? Sure is. The phase is on 0° and its running on 85. Great improvement so far.... Thank u & cheers Thor  |
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Platinum Member Username: Jan_b_vigneDallas, TX Post Number: 12173 Registered: May-04 | . Try swapping the location of the speaker and the sub. |
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Bronze Member Username: LuxendelGondelsheim, Baden-Württe... Germany Post Number: 43 Registered: Oct-07 | Will try... Reason is? |
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Platinum Member Username: Jan_b_vigneDallas, TX Post Number: 12174 Registered: May-04 | . You'll probably still do better with the subwoofer loading directly into the 45/45° angle of the corner and the speaker should sound better overall when it is out of the corner and away from the sidewall. Put "loudspeaker placement" in a search engine. |
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Bronze Member Username: LuxendelGondelsheim, Baden-Württe... Germany Post Number: 44 Registered: Oct-07 | Just did as adviced!!! Again lots of improvement!!! Thanks, Jan. Cool.  |
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Gold Member Username: NuckPost Number: 9716 Registered: Dec-04 | The pics in this thread are really helping, TL. |
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Gold Member Username: NuckPost Number: 9717 Registered: Dec-04 | That is a very good looking room, to me. But a very hard and reflective room to listen in. |
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Bronze Member Username: LuxendelGondelsheim, Baden-Württe... Germany Post Number: 45 Registered: Oct-07 | Hmmmmmmmmm, could u be more specific Nuck? How you mean "hard and reflective"? Because of the wood and the tiles? Right now, the sound is INCREDIBLE. Fat as hell, crystal clear...the bass is so frigging tight...cool. I do not hear any bad "reflective" sounds. Its not muddy at all. Removing the custom-bridges from NAD from main-in to pre-out solved the little harshness in the treble-area. The whole whouse is made from wood. Its the only room I can use for listening. I know...the room is a uneven square. The HIFI-system is in the second half of the room. The whole room is apprx. 11m x 5m... To me, all is fine... Better it can always get...  |
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Gold Member Username: Arande2Rattle your ... Missouri Post Number: 2804 Registered: Dec-06 | "Better it can always get..." Yes! You might try an IB sub or four-corner box placement if you want even more improvement. |
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Bronze Member Username: LuxendelGondelsheim, Baden-Württe... Germany Post Number: 50 Registered: Oct-07 | Thanx, Andre... but what is 1)an IB sub 2)four-corner box-placement??? Cheers |
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Silver Member Username: DavidpaPortland, Oregon US Post Number: 525 Registered: Nov-05 | Internet Brand. Subs in four corners. Andre's still learning. Ignore the post count! He just likes bass. And is still working on quality vs. quantity. Let Jan learn ya! |
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Gold Member Username: Arande2Rattle your ... Missouri Post Number: 2806 Registered: Dec-06 | I'll eventually grow out of it. But...I'm having fun with it right now.  IB is equal to a huge sealed box, of course. Yes, you really should disregard my post count, or anyone's for that matter. What's the point in quality if you can't hear it? What's the point in quantity if it sounds horrible (clubs)? TBH, what you're saying there makes me think that you have not heard such a setup before (four corners) with good subs. It's quite amazing, really. You can also look at some graphs where they did testing that shows large improvement over a single sub in the corner. The internet is annoying because we're probably misunderstanding each other left and right. Ahh. It's fine though, TL. I doubt it's practical for most people anyway. It does depend on the person, though... Good day. |
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Platinum Member Username: Jan_b_vigneDallas, TX Post Number: 12190 Registered: May-04 | . "IB" = infinite baffle. I hope that's what you've been talking about all this time, Andre. http://www.voy.com/28770/ http://white.hometheatertalk.com/tips/ib.htm Very expensive, needs huge amounts of power and can sound better than anything you buy in a shop. . |
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Silver Member Username: DmitchellOttawa, Ontario Canada Post Number: 601 Registered: Feb-07 | Nice place, TL. |
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Bronze Member Username: LuxendelGondelsheim, Baden-Württe... Germany Post Number: 53 Registered: Oct-07 | Thank u, David... Its a decent wood-house with a concrete platform (cellar). The room is not really the best "listening room", but for a newbie like me, its fat enough. |
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Silver Member Username: DmitchellOttawa, Ontario Canada Post Number: 602 Registered: Feb-07 | Love all the wood! I can see how that ceramic floor would create a lot of slap and echo. |
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Gold Member Username: Arande2Rattle your ... Missouri Post Number: 2808 Registered: Dec-06 | Well no, Jan, it's all about infinitesimal baffles these days. Well.. not really. I always thought you could do a pretty decent IB with a couple of 18s for about $1200, which isn't too bad. It also depends on whether or not you consider 1kw to be a lot of power. It's not that much in comparison to some 10,000w LLT systems people build. |
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Platinum Member Username: Jan_b_vigneDallas, TX Post Number: 12194 Registered: May-04 | . Uh-huh. |
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Bronze Member Username: LuxendelGondelsheim, Baden-Württe... Germany Post Number: 54 Registered: Oct-07 | Yo, the ceramic tiles....not SUCH a big problem... I can hear no real disturbance...the carpet also helps a lot. Its the only room I can use...but I am right VERY happy. We own the house by the way.... |
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