Official Rythmik Audio Subwoofer thread - Page 218

FV15HP and FV15 are close enough. You don't need to do any adjustment.

Hi Brian, long time no speak. Hope all is well.
In determining these audible differences, how did you eliminate perceptual biases and other confounders as the root cause and ascribe the differences to the cables effects on the physical soundwaves within the soundfield?


I'm surprised an engineer such as yourself would use an appeal to authority fallacy as your argument. George Bush could have told you that and it have no more validity in supporting your conclusion. Actually, if Ken Kantor was there, I doubt Bill Bush would have been doing any such thing http://www.classicspeakerpages.net/I...ndpost&p=83025.
Btw, any word on the 8" servo amp?

cheers,

AJ

I've always wondered this too. I don't want to turn this into a cables thread but I've only seen measurements for l,c,r. I've always been in the cables don't matter camp but if I have extra money in x amount of years after completing my system, I may still check some out for fun or out of boredom. Chesky has a cd with three versions of one track using different interconnects. Sometimes I think I may hear a difference near field but I can't be certain. Even if I was pretty sure there was a slight difference, it is not significant enough in my current system to make me want to try others.

I uploaded these files into AudioXplorer. I'm not sure if the difference is due to how the program extracts the file. I uploaded each file again and the results are the same.

The RLC is definitely one direction. But there can be another angle such as interference immunity and yet another direction is microscopic behavior vs macroscopic. If you do an FFT, the difference is even smaller. FFT is a accumulative/aggregated behavior. It is summed over the sample window. What you see is detailed moment-by-moment change and each instance only account say 0.5% of the result. That is the difference between microscopic and macroscopic (for lack of a better term). BTW, we should really stay on topic now. I will start with myself.

Hi Brian,

Your inbox is full... and its Rubber feet and wood over concrete floor ;-)

If only the subtuner can tune for 2 subs, it'll be perfect.

Hello, I was hoping to get some feedback from Rythmik owners and maybe the man himself. Here's the important information:

Budget: $1500-$2000
Listening habits: 50/50 music/movies
Room size: ~3000 cu ft sealed
Denon 2312, typically -15 for movies and -25 for music on the dial.

I have owned a PB10-NSD for 5 years, and it's time to upgrade. I do live in a ~900 sq ft condo, but I am fortunate to have my living room against concrete brick walls and my only connecting walls with a neighbor are in the back of the house. I own Ascend CMT-340s across the front and CMT-170s for surrounds. I'm primarily interested in Rythmik due to Dave's support from Ascend, and the quality of the subs offered by Brian.

Here's where I need help. In the 4 years I've been in my condo, my neighbors have never complained about my sub (probably because my room eats my PB-10 alive ). I want to get enough sub for my room, but hopefully avoid going overboard to create neighbor friction. I am open to dual subs and I have the space for two F12 or F15. Based on user experiences, would a FV-15 or a pair of sealed do better in my room? Any feedback is appreciated, thanks.

Since there is a music component in your usage, I would go with two sealed ones. There is no going overboard as you can reduce the sub level via the AVR. Two subs should provide better dispersion in the room versus a single sub, a single sub would have areas where there more bass than others sections of the room. I would go with the 15 inch versions just to remove that "What if" factor thats going to drive you nuts forever when you get the 12

Thanks for your thoughts. The comment about getting the 15s over the 12s to eliminate the inevitable "what if's" is a big thing to me. Even if 12s are enough, I'd eternally wonder what 15s would be like until I upgrade again. It's probably the best idea to get a pair of F15s and be happy.

+1

When I was looking to upgrade from my single, BASH-powered PB12-NSD for my ~3,375 cu.ft. HT area, the guys at Rythmik recommended going with either dual F12s or a single F15. Based on that, I think either of those options would work well in your smaller, 3,000 cu.ft. space.

That being said, I decided to order dual F15s, just to be sure. After a few months of back-order on the finish I wanted, I went instead with the ChaseHT SS-18.T: Dual 18" passive subs powered by a Dayton Audio SA1000 amp. No regrets!

So, having said all that:

+2.

You're almost there,one more step........................................................ ...............................2 F15hp!
Works for me,in a room smaller than yours! Take advantage of the multiple sub discount.





no such thing as too much horsepower,money or subwoofer.

I agree with the others, and the "what ifs" can sometimes cost you more money in the long run.

What's the status on the getting in more FV15HP drivers? When can we expect the back ordered subs to ship?

Subtuner2's objective is to achieve phase alignment between the sub and front speakers. When we introduce one additional sub, there are more variables being introduced. For instance, what is the crossover frequency and playback volume level? Assuming, we keep all of those the same and all we want is to achieve phase alignment between those two subs and front speakers, the problem then becomes simpler. This is what I would recommend. Use the subtuner2 on the farther sub and set up the distance on AVR. Then measure the physical distance delta between the two subs to you, and use the phase control knob on the closer sub to compensate for distance difference. For instance, if the distance difference is 5ft, that is 5ms. On the closer sub, adjust the phase/delay control knob to 11 o'clock position and that should achieve good phase alignment. This trick can also be applied to the initial setup before one uses Room EQ for multiple subs. The only limitation is one needs to be aware that the max delay our control knob can do is half wavelength. If the crossover is 80hz, half wavelength is 6ft. So our delay adjustment knob maxes out at 6ms at 80hz. If one sets the crossover to 60hz, the delay adjustment knob maxes out at 8ms, or 8 ft.

What if both subs are the same distance from the lp?

I assume you do the calculation like if you had only one sub since they should be set the same in theory. However, I'm curious about this too since I have mine set up this way also.

Is the Rhythmic Audio website down or under construction? I cannot access it.

works fine for me.

http://www.rythmikaudio.com/


that help?

Rythmik with a "k"

Duh! My bad! I should have cnown!

Actually Rythmik is still not opening, I tried all day long on computer and iPhone. . Tried Safari, Firefox, and Chrome on the computer. . Maybe a northeast internet snafu

Ordered an F12 thru Ascend Acoustics.

Worked fine for me. Probably an ISP issue...

Rythmik site works for me

As Ryan pointed out, you will use that distance. If you do use Audyssey or other roomEQ, you don't really need to do any thing special. If you consider the dispersion lobe, it will also be symmetric. That is another plus. On the other hand, if you do have two subs with different distance, the distance difference can be such that at crossover frequency, the two subs themselves already cause cancellation of one another. Putting an extra analog delay (that is what the phase/delay control knob is doing) on the closer sub, will make the phase more coherent and Audyssey or other program can do a better job.

BTW, this phase adjustment on PEQ3 plate amp is only available when using LINE-IN (or high level in), but not LFE in.

That's what I had done,just wondered if there were any other setting differences when using two the same distance from lp. Thanks again Brian,the subs are great!

Getting tired of waiting and no details on what to expect... I've been looking at other options...

and might make a move on a couple of Captivator 1000. If only I knew what I was waiting for. I know it's going to be a dual 15" with a 800 watt amp but are there going to be any DSP controls?

Let's see how long I can hold out. Getting a itchy pocket.

I have been waiting for nearly year and a half for the new F25 and I will continue to wait patiently. I believe Brian said they should be ready in another month or so. I'm getting a pair to mate with my Danley SM60F point source synergy horns (99dB sensitivity). My stereo system is mainly for music (95%); I have been listening to lots of chamber music and vocals while waiting for the new F25s after my old sub broke down. Can't wait to experience large scale symphonic music which is my love with those four 15" servo-controlled high-definition drivers in my system. I'm sure I wouldn't be disappointed.

Seems rather petty to complain and post a link to a competitor in a manufacturer's thread... Drop Brian a note, or email, or call, and ask him if he has a better date. Since he is still a small player volume-wise much is out of his control. If you can't wait, get the JTR and be happy.

Praise in public, piss in private...