Polk sub vs klipsch sub

[JOHN FICKEL]

Now back to our regularly scheduled program Lol

 

[tyhjaarpa]

Ok, if you don't mind me asking, What method did you use ?

I have left it to what AVR measured for distance.

 

[lovinthehd]

The only thing that drives me nuts about subwoofers, is the distance settings for them. One person to tells you use a tape measure, the next tells you use what the auto calibration sets. Which is it ?? FOR SURE

Where did you see the advice to simply use a tape measure? How do you allow for the sub's amp processing time? Altho there is an Audyssey distance tweak....

 

[JOHN FICKEL]

Audioholics, Well Gene just did a video with that Denon receiver, When he got to the distance part of the demonstration, he mentioned he uses a tape measure for all distances. Unless I misunderstood

 

[JOHN FICKEL]

I've also, and currently use the AVR for all distances

 

[JOHN FICKEL]

I have left it to what AVR measured for distance.

Ok. Thats also what I have done, Thank you for the response

 

[JOHN FICKEL]

Lovinthehd, Thanks for the post, that was extremely extremely detailed. I'm happy with the way mine sounds now, just trying to make sense of what other people are saying as well. As you already know, I have posted many times lol, I have a Yamaha RX-Z9 that has two independent subwoofer pre-outs. I have two Klipsch R-115SW subs.. I have an L shaped living room, pretty large. My subs are located in opposing corners. One in the front left corner, and the second in the back right corner . I'm physically only 10 and 11 feet from each sub, YPAO puts them at 16ft away. Again sounds great, just trying to make absolutely sure that YPAO is 100% correct with distance for each sub that it has selected. But the physical distance Compared to YPAO distance, is only 6 ft or so difference. I really don't think that 6ft would make any real sound difference, Being were talking about milliseconds in time travel.

 

[lovinthehd]

Audioholics, Well Gene just did a video with that Denon receiver, When he got to the distance part of the demonstration, he mentioned he uses a tape measure for all distances. Unless I misunderstood

Which Denon avr video are you referring to? Got a link?

 

[JOHN FICKEL]

Which Denon avr video are you referring to? Got a link?

It's on the main page of the site. It's the third story down

 

[JOHN FICKEL]

It's an older Denon receiver, pretty advanced, for distances there's only one right way to do it. From my understanding you never use a tape measure to measure for (Subwoofer distances).

 

[JOHN FICKEL]

Watch Gene's video. It's good

 

[lovinthehd]

It's on the main page of the site. It's the third story down

Hate watching videos (have to turn the audio down on what I'm listening to already ). I do see that article and this paragraph on the distance setting, is the video different?

Seriously, how important can this be? You let auto-calibration take care of this for you, or if you’re feeling particularly hands on, you might whip out the tape measure, right? A word of wisdom: don’t underestimate the power of the distance setting in your A/V receiver. Obviously the primary job of the distance setting is setting a delay relative to your other speakers. Note, the distance reported by your receiver’s auto-calibration will be inclusive of any delay caused by signal processing happening inside the subwoofer (EQ, low pass filtering, etc.), which can add several feet to the distance per your tape measure. Above and beyond this, the distance adjustment functions as a phase control of sorts. Adding or subtracting a couple feet from the distance of your subwoofer is a viable way of getting rid of an ugly peak or dip around the crossover point. Again, to make the most out of this tool, one does need the ability to take measurements. Still, who would have ever thought such an innocuous setting could have that kind of power?

 

[everettT]

Audioholics, Well Gene just did a video with that Denon receiver, When he got to the distance part of the demonstration, he mentioned he uses a tape measure for all distances. Unless I misunderstood

Each proprietary room correction, behaves differently. I'm not sure if phase control has an effect on their respective algorithms regarding time alignment.

 

[JOHN FICKEL]

Will have to pay close attention when he does the auto calibration video. I'm hoping he mentions about the auto calibration subwoofer settings..... I'm not saying that it's important and I'm sure the AVR's are doing it properly. Provided one doesn't have the volume Gain on the back of there subs set to high. Otherwise Odyssey or YPAO Will not give you accurate results at all

 

[Grassy]

Which Denon avr video are you referring to? Got a link?

Here is your link off the AVPA1HD from 5:00 onwards gene talks about measuring with a tape measure.

 

[rojo]

I've spent some time today finding the right subs and I'm going with two of these https://www.skaraudio.com/collections/ix-series/products/ix-8?variant=17677557121. Beefy sub for $39, free shipping and quite honestly probably better than 75% of what's on the market for home audio subs. I fairly certain I can wire in series for get to 8 ohms. From what I've read I should be able to skate by with an El cheapo plate amp. Probably around the 150 watt range. I will build the box myself with 3/4" ply. Most likely a transmission line box. I'll take pics along the way and create a new thread when completed. This is taking me back to my car audio days from younger years. I'm sure the box I build will be 100% better than back then using only a skil saw and hammer and nails. Ha

Why would I need massive eq and amplification? Genuinely asking, not trying to be a smart a**. The rms is 150 for the sub. As for the box, I have given up on the ridiculously complicated transmission line and am going with a sealed box built to the manufacturers specs. Not trying to join the audio Olympics here, just trying to build a sub that will boom boom.

As my father-in-law says, if you can't listen, you'll just have to feel. After you realize the time, effort, and money you've wasted on your epic failure, come back when you're ready to listen.

Here are a few simulations of predicted frequency response at 150 watts. The pink line is what you intend to build. It will have a Q around 0.76 -- not horrible, but still not critically damped. The purple line is your same driver in a 1ft³ box with a 4"⌀ * 11 5/8" vent, which you could flatten a bit with EQ but it's still Xmax limited and worthless below 40Hz. The yellow line is the Infinity 1260w that others suggested to you in a 2.6ft³ vented box tuned to the Fs of the driver. The 1262w models very similarly (although it requires slightly different tuning), and can be wired for 8 ohms if you want to use a less expensive amplifier.

What you're not realizing is that cabin gain in a car will boost frequencies below 40Hz, but the gains in a room where there's so many thousands more cubic feet to pressurize are much less profound. For home theater, you need a driver with a lower resonant frequency. Your bargain driver is no bargain if it doesn't do what you need it to do.

 

[lovinthehd]

Here is your link off the AVPA1HD from 5:00 onwards gene talks about measuring with a tape measure.

Odd he doesn't discuss the downside to simply using a tape measure on the subs....

 

[JOHN FICKEL]

I asked him on Facebook.. And he told me.. As a starting point, it's good to measure with a tape measure. What matters is how it blends. Verbatim!

 

[JOHN FICKEL]

As of now I have mine done with a tape measure. And it sounds great. I'm going to leave this way for a while, then. Go back too the AVR setting. But as of now. Using the tape measure sounds GREAT

 

[lovinthehd]

As of now I have mine done with a tape measure. And it sounds great. I'm going to leave this way for a while, then. Go back too the AVR setting. But as of now. Using the tape measure sounds GREAT

I'd use the remote control and play with a wide range of "distance" settings to see if the actual physical distance indeed provides best results for delay.