Official Rythmik Audio Subwoofer thread - Page 611 - AVS | Home Theater Discussions And Reviews
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post #18301 of 18323 Unread 04-18-2015, 05:00 PM
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Guys i just finished the calibration of my system ussing my avr multeq xt. If i want to check the calibrated db of my subwoofer using spl meter how to do that? My avr set it it +2.5db. I want to check if it is 75 to 78 db. Do i need to sit from my main sitting position and hold the spl? It seems that from my sitting position it gives me on 70db running pink noise from my avr. Tia.
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post #18302 of 18323 Unread 04-19-2015, 07:41 AM
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Originally Posted by tapsilog View Post
Guys i just finished the calibration of my system ussing my avr multeq xt. If i want to check the calibrated db of my subwoofer using spl meter how to do that? My avr set it it +2.5db. I want to check if it is 75 to 78 db. Do i need to sit from my main sitting position and hold the spl? It seems that from my sitting position it gives me on 70db running pink noise from my avr. Tia.
Hey. Audyssey is generally very good in setting spl levels if you follow their straight forward directions from the website. If you've done that, I wouldn't worry too much about it.

You may just be sitting in a null and increasing the SPL of your sub may make it sound boomy in other areas.

You could do a couple of things. Do a subwoofer crawl to find the best placement for your sub or you could try moving your seating as well. You could buy a second sub and place them in opposite corners or opposite mid points of walls as wel.

However, their are those that like to run their subs hot, so you could increase your trim to +7.5 from + 2.5 and see how that sounds to you.

I hope that helps a little.
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post #18303 of 18323 Unread 04-19-2015, 04:41 PM
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Quote:
Originally Posted by tapsilog View Post
Guys i just finished the calibration of my system ussing my avr multeq xt. If i want to check the calibrated db of my subwoofer using spl meter how to do that? My avr set it it +2.5db. I want to check if it is 75 to 78 db. Do i need to sit from my main sitting position and hold the spl? It seems that from my sitting position it gives me on 70db running pink noise from my avr. Tia.
You will need external test tones to verify 75dB at the Main Listening Position (MLP). The test tones within the AVR cannot implement the room correction filters when Audyssey room equalization set to ON.

If you swtich OFF Audyssey when carrying out the measurements, you are effectively checking for an un-corrected response of your room.

If you have source device that can play blu-ray discs, the AIX records audio calibration test disc is a worth while purchase. The AIX audio calibration disc and SPL meter can then be used to verify your levels and trim settings with Audyssey ON the AVR.

Maranatz SR-7009, Oppo BPD-93, MTV 7000D, LG LW6500, aTV, WDTV Live, Harmony 650 remote, KEF E301, MiniDSP(2x4), Rythmik F12G
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post #18304 of 18323 Unread 04-19-2015, 05:45 PM
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Originally Posted by johnnymacIII View Post
Hey. Audyssey is generally very good in setting spl levels if you follow their straight forward directions from the website. If you've done that, I wouldn't worry too much about it.

You may just be sitting in a null and increasing the SPL of your sub may make it sound boomy in other areas.

You could do a couple of things. Do a subwoofer crawl to find the best placement for your sub or you could try moving your seating as well. You could buy a second sub and place them in opposite corners or opposite mid points of walls as wel.

However, their are those that like to run their subs hot, so you could increase your trim to +7.5 from + 2.5 and see how that sounds to you.

I hope that helps a little.
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Originally Posted by steveting99 View Post
You will need external test tones to verify 75dB at the Main Listening Position (MLP). The test tones within the AVR cannot implement the room correction filters when Audyssey room equalization set to ON.

If you swtich OFF Audyssey when carrying out the measurements, you are effectively checking for an un-corrected response of your room.

If you have source device that can play blu-ray discs, the AIX records audio calibration test disc is a worth while purchase. The AIX audio calibration disc and SPL meter can then be used to verify your levels and trim settings with Audyssey ON the AVR.
Thanks guys for the response. I'm not expert. Maybe for now i will just leave it what audyssey set. ☺
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post #18305 of 18323 Unread Yesterday, 03:21 PM
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It's so adorable. Here's my first crack at a sweep.
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post #18306 of 18323 Unread Yesterday, 03:28 PM
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Originally Posted by 12B4A View Post
It's so adorable. Here's my first crack at a sweep.
What other subs have you owned? I'm upgrading from a Velodyne VX-10 to 2xRythmik L12 and since you're the first person to own one, I'd like to know how you think it stacks up to other subs you've had.
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post #18307 of 18323 Unread Yesterday, 03:59 PM
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I'm sorry but my home theater sub experience is limited. The sub I had before was a 12" bandpass with a Pioneer driver I put together nearly 20 years ago. It started rolling off around 28hz and was 25db down at 15hz. Needless to say, the L12 is in a completely different performance category compared to that. I was ready to go with the LV12R until I saw that the L12 package would be a better physical fit for my situation. I have to listen to some more music and watch a few bombastic movie scenes but so far it's working very well.

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post #18308 of 18323 Unread Yesterday, 04:18 PM
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Originally Posted by 12B4A View Post
It's so adorable. Here's my first crack at a sweep.
Ah, the first L12 sighting! Since you're the first to report ownership of the L12, what more can you tell us (since it's not officially on the Rythmik website yet)?

Dimensions? Pic of the amplifier/controls? Installation Guide/Quick Guide? Price? etc.

Looking forward to your listening impressions after you've got it dialed-in.

Oh, and welcome to the Rythmik Clan.

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post #18309 of 18323 Unread Yesterday, 04:53 PM
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Without the grill and feet it's 14x14x14. The rubber feet add 3/4 inch on the bottom and the grill 1 inch on the front. With the shipping box it was 60lbs. It's dense. It has the same controls as the LV12R quick guide. I'm pretty sure Rythmik will have more pictures soon.

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post #18310 of 18323 Unread Yesterday, 08:33 PM
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Originally Posted by 12B4A View Post
It's so adorable. Here's my first crack at a sweep.
With your permission I'm gonna steal this picture to post it in our Facebook page This is the first L12 we sell and it's the one we used for the photo session

Correction: The one we used for the photo session was Black Matte, yours is Black Oak

Best Regards,

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post #18311 of 18323 Unread Yesterday, 08:57 PM
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Go ahead. I think you're going to sell a lot more. You just need the right cardboard boxes to ship them.

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Hi Guys,

I was wondering, for people who have the lv12r, where do you set the gain knob on the back of the subwoofer? I use a y splitter to hook up my sub from my receiver and have to have the gain knob at the 1-2 o'clock position to get adequate output. Is this normal?

On my old sub, I only had to have the gain at 9 o'clock with the y splitter, so I'm getting a little concerned with the rythmik.
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Originally Posted by agg133 View Post
Hi Guys,

I was wondering, for people who have the lv12r, where do you set the gain knob on the back of the subwoofer? I use a y splitter to hook up my sub from my receiver and have to have the gain knob at the 1-2 o'clock position to get adequate output. Is this normal?

On my old sub, I only had to have the gain at 9 o'clock with the y splitter, so I'm getting a little concerned with the rythmik.
it depends on placement. mine is at 12 position and the avr has it turned down 1 or 2 db. Your probably in a room null and need to do a subcrawl to find out the lv12r best placement
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post #18314 of 18323 Unread Yesterday, 10:24 PM
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Originally Posted by agg133 View Post
Hi Guys,

I was wondering, for people who have the lv12r, where do you set the gain knob on the back of the subwoofer? I use a y splitter to hook up my sub from my receiver and have to have the gain knob at the 1-2 o'clock position to get adequate output. Is this normal?

On my old sub, I only had to have the gain at 9 o'clock with the y splitter, so I'm getting a little concerned with the rythmik.
How does the new sub sound? What was the old sub? Did you put the LV where the old one was?
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Originally Posted by agg133 View Post
Hi Guys,

I was wondering, for people who have the lv12r, where do you set the gain knob on the back of the subwoofer? I use a y splitter to hook up my sub from my receiver and have to have the gain knob at the 1-2 o'clock position to get adequate output. Is this normal?

On my old sub, I only had to have the gain at 9 o'clock with the y splitter, so I'm getting a little concerned with the rythmik.
Remember the gain knob is not the volume knob (even though Rythmik labels as volume). It is just the voltage adjustment. Some manufacturers have a very sensitive gain knob such as the Hsu I used to have. I had to turn it up just a hair literally from minimum to have Audyssey set it less than -12 on my sub channel. So as long as your sub trim after auto calibration is within -12 to +12 (if you have Denon avr) you are okay. Personally, I would try to get the sub trim within about -6.
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Uh, adjusting the input voltage to the amp does adjust the volume, and the gain, output relative to input... It sounds like the Hsu did not use an audio or log taper potentiometer for gain/volume control, just a linear pot.

"After silence, that which best expresses the inexpressible, is music" - Aldous Huxley
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Originally Posted by 12B4A View Post
It's so adorable. Here's my first crack at a sweep.
Just seen these same pics on Facebook on the Rythmik Page, yet not seening this model on their website!

Anyone hsa a link to the specs, price, etc?

Thanks

Edit: Never mind I got some info from the thread.
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post #18318 of 18323 Unread Today, 07:00 AM
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See post 18282 a page or two back.
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Uh, adjusting the input voltage to the amp does adjust the volume, and the gain, output relative to input... It sounds like the Hsu did not use an audio or log taper potentiometer for gain/volume control, just a linear pot.
Agree. It's just that folks upgrading from a less capable 100W 10"/12" sub think there's something wrong with the new sub as they see the need to have a higher volume set on Rythmik to achieve the same loudness of his/her previous sub. Also clean sound sub does not seem to sound as loud as bad/high distortion sub.
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Agree. It's just that folks upgrading from a less capable 100W 10"/12" sub think there's something wrong with the new sub as they see the need to have a higher volume set on Rythmik to achieve the same loudness of his/her previous sub. Also clean sound sub does not seem to sound as loud as bad/high distortion sub.
It's possible that the lack of a boomy 50-60hz makes the new sub perceived as less impact. its also possible that they put the new sub where the old one was and that may cause them to be in a null or further into a room mode dip.
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I did some more fooling around and took out the DWMs in the superMMG system. One sweep is with Audy dynamic EQ and the other without. I made the amp of the sub (this one is the HX310) go in to partial limiting in the very high 90's at 15-20hz.

When I decided that I wanted to get a new subwoofer, I knew I wanted extension but also needed small size. According to Hoffman's Iron Law, I'd have to give up on sensitivity or to put it another way, useful high volume output. I would have to say the L12 design is an embodiment of picking those 2 out of 3 of HIL. I honestly don't know if there are other manufacturers that can achieve these results under these conditions but at this point, I'm done looking because the L12 is doing exactly what I wanted and then some more.
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post #18322 of 18323 Unread Today, 02:23 PM
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IME the main reason a good sub does not sound as loud is because the harmonic distortion is lower. The second harmonic of a 50 - 60 Hz tone is 100 - 120 Hz and to many that sounds like "real bass". Truly deep bass you "feel" instead of "hear" -- 'ish.

As an aside, decades ago when I was working as part of a study on localization, distortion was a huge PITA when running the tests. A little bit of harmonic would make the sub much, much easier to find. We ended up using my home-brew servo sub for much of the testing. Interestingly enough , the circuit appears very similar to what Brian is using in Rythmik. No wonder I ended up here! And, I should have patented in back then but was way too young/naive to think about it. To be clear, Brian's design has taken the concept further, and takes advantage of modern speaker and cabinet designs.

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post #18323 of 18323 Unread Today, 04:48 PM
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Quote:
Originally Posted by 12B4A View Post
I did some more fooling around and took out the DWMs in the superMMG system. One sweep is with Audy dynamic EQ and the other without. I made the amp of the sub (this one is the HX310) go in to partial limiting in the very high 90's at 15-20hz.
For music mode (low-music on bass extension switch), we let it extend low so that it can retrieve as much hall effects and nuisance. But if there is too much sub-20hz energy, then we also have HT mode switch which will filter out sub 20hz energy for higher SPL movie playback.


Quote:
When I decided that I wanted to get a new subwoofer, I knew I wanted extension but also needed small size. According to Hoffman's Iron Law, I'd have to give up on sensitivity or to put it another way, useful high volume output. I would have to say the L12 design is an embodiment of picking those 2 out of 3 of HIL. I honestly don't know if there are other manufacturers that can achieve these results under these conditions but at this point, I'm done looking because the L12 is doing exactly what I wanted and then some more.

Thanks for the positive feedback.
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