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Official Rythmik Audio Subwoofer thread - Page 396

post #11851 of 15239
^^please do. Glad to hear.
post #11852 of 15239
Okay so I level matched each sub till they were within a half db from 0 on the reciver. Once I got the second one to match the first I plugged them both in and played them as normal. Was I supposed to run yapo one more time with both subs hooked up? I was thinking about it and i realized I gaind about 6 dbs when hooking both up and not running yapo together. If I need to do it again ill do it in the morning and just kick the reciver bass down a few dbs for tonight. It definitely sounds bass heavy but that's a good thing in my eyes
post #11853 of 15239
Quote:
Originally Posted by Bill Fitzmaurice View Post

Yes, it is. That keeps the distance from the LP to the wall behind it at a minimum, which eliminates any bass nulling from the wave reflected off that wall. The distance between the sub and the wall to the left of the LP is a problem. He'd probably get best results with the sub less than 3 feet from the left hand wall. But the main issue as I see it is room pressurization, which one small sub is not going to do with that much space to fill.

My layout is roughly same as OP has, and I've checked it with REW. All he can do is to play some bass heavy scenes and stand close to the kitchenette; he should feel more pressurization in that spot.
post #11854 of 15239
Just picked this up smile.gif


and have to bring it up here. Thanks for my friend's help.
post #11855 of 15239
Quote:
Originally Posted by enricoclaudio View Post

Get a 3 to 2 prong adapter (cheater plug). If the hum goes away then you have a ground loop.


BTW, never use those near water.
post #11856 of 15239
Quote:
Originally Posted by newc33 View Post

Okay so I level matched each sub till they were within a half db from 0 on the reciver. Once I got the second one to match the first I plugged them both in and played them as normal. Was I supposed to run yapo one more time with both subs hooked up? I was thinking about it and i realized I gaind about 6 dbs when hooking both up and not running yapo together. If I need to do it again ill do it in the morning and just kick the reciver bass down a few dbs for tonight. It definitely sounds bass heavy but that's a good thing in my eyes

You want to get your subs either level matched or gain matched first, then run room correction on the AVR with BOTH subs on. If you are using any external eq on the subs, be sure to have that also set before room correction on the AVR.
post #11857 of 15239
Quote:
Originally Posted by rcohen View Post

BTW, never use those near water.

It might be best to never use those period...yes, it is very rare, but removing the ground could lead to some really bad consequences, the least of which would be bricking the amp. http://en.wikipedia.org/wiki/Cheater_plug
post #11858 of 15239
^^^

The signal ground is still there (even though it is via a 10ohm resistor). Some AVR does not come with power ground connection at all. For instance, I have used 5 different Denon AVRs in the past and NONE of them has the power ground pin in the power socket. Imagine more ground loop problem would have been reported had those Denon AVR had ground pin. So how can they do without a ground pin? There are this safetly class I and safety class 2 two different schemes. The later does not require power ground connection (which my 700WRMS Denon AVR falls into). The difference between class 1 and class 2 is that those wires going into the primary turn of transformer needs to be double insulated in the latter and our amps do have that. Our LV12R do not have ground pin either and when one customer called me saying he had a hum noise, I concluded it was as broken cable ground problem (because it cannot be ground loop). He was surpised to find out his brand new cable was indeed defective due to broken cable ground.

-
Edited by Rythmik - 11/28/13 at 3:53am
post #11859 of 15239
I don't like it (creature of habit) but in California, for decades, appliances such as electric stove tops have been using the neutral return (white wire) as the ground.

Wiring has gone to polarized duplex plugs and three prong ground plugs are fast falling from manufacturing favor.

(i don't like it but that hasn't stopped the above from taking place)
post #11860 of 15239
Quote:
Originally Posted by dlozy View Post

I just plugged in and powered up my FV15HP and the sub has a humming sound coming from it, I tried a different cable and nothing. If I unplug it from the AVR it stops, but if I turn off the AVR it continues, any ideas?


If you are hooked up to coax cable, this is the best $9 I ever spent. Parts Express Isolation Transformer.

http://www.parts-express.com/dayton-audio-vit-1-isolation-transformer--180-075
post #11861 of 15239
Pictures worth thousand words smile.gif
Before:


After:


Before:


After:
post #11862 of 15239
Brian, what, if any, surge protection do you recommend?
post #11863 of 15239
Quote:
Originally Posted by Audiophile2k View Post

You want to get your subs either level matched or gain matched first, then run room correction on the AVR with BOTH subs on. If you are using any external eq on the subs, be sure to have that also set before room correction on the AVR.

Yes I first got the left sub so it was within 1db from 0 on the reciver then I unplugged that sub and did the same with the right.

So was I supposed to yapo them with both connected one last time?

I figured if each sub was set within 1db of zero and then I connected both without re running yapo a final time I gained an extra 6 dbs or so right?

So even though I'm running my reciver at 1db hot its really 7 dbs hot because I added the secomd sub without running yapo one last time

Does this make sense? Lol

Am I thinking correctly
post #11864 of 15239
Quote:
Originally Posted by Cowboys View Post

Just picked this up smile.gif


and have to bring it up here. Thanks for my friend's help.

Awsome! Let me know what ya think
post #11865 of 15239
Quote:
Originally Posted by Cowboys View Post

Pictures worth thousand words smile.gif

Before:


After:

I don't wish to be seen as unappreciative of your posting efforts. These images don't speak to me other than a few words saying you've doubled the number of subwoofers in your Home Theater. confused.gif

What has this action done for your listening pleasure?

(visceral impact and depth of extension)

Story, story.

Everything I read says visceral impact is affected by depth of extension and everything I read says one has to pick one or one has to up their budget, that much more.

(ticks me off)

monkey1.jpg

-
Edited by BeeMan458 - 11/28/13 at 6:50am
post #11866 of 15239
Quote:
Originally Posted by newc33 View Post

Yes I first got the left sub so it was within 1db from 0 on the reciver then I unplugged that sub and did the same with the right.

So was I supposed to yapo them with both connected one last time?

I figured if each sub was set within 1db of zero and then I connected both without re running yapo a final time I gained an extra 6 dbs or so right?

So even though I'm running my reciver at 1db hot its really 7 dbs hot because I added the secomd sub without running yapo one last time

Does this make sense? Lol

Am I thinking correctly

Before YAPO you need to make sure they are playing at the same level either at your listening position (level matched) or when placed at the same spot in the room (gain matched). If you don't do this one sub may be overpowering the other, and not giving you the full benefit of dual subs. To do this you need some sort of SPL measuring device and a broad spectrum test tone. If you have nothing to measure them with, and they are placed fairly equidistant from you, then you can hope the gain structure on the amp is similar and place the volume knob on each sub at exactly the same position. You want to do all that BEFORE running room correction. Then you want BOTH subs on when you run room correction. I don't know which version of YAPO you have, some will EQ subs, others will not. Some Yammys will treat 2 subs independently, others will treat them as one sub in room correction. My preference is level matching, so if you don't already have one you can get a decent SPL meter off ebay for under $20, and it would be a good investment.
post #11867 of 15239
Quote:
Originally Posted by rcohen View Post

BTW, never use those near water.
Never use them at all other than to diagnose a ground loop issue, then fix it using a safe method. BTW, the purpose of these isn't to defeat ground protection, which is there to keep you alive. These are intended to add ground protection when your house wiring has old two-prong outlets. The eyelet is there to screw the plug to the outlet, providing the third prong a ground connection to the outlet box.
post #11868 of 15239
Ya i have a spl meter but no test tone right now

I thought that I could level match using yapo? The left sub is set at about 11oclock and the other closer to 10oclock.

When I run yapo individually they both come out to within a half dbl of 0 on the reciver. Hence they are level matched?

If they weren't level matched to listening position then one would end up setting reciver sub to say +5 and the other to say -3 for example
post #11869 of 15239
Just adding, as long as the outlet box is made of metal and grounded.

Some house wiring ran a separate copper ground wire, next to the two wire conductor and older knob-n-tube didn't use grounds.

-
post #11870 of 15239
Quote:
Originally Posted by newc33 View Post

Ya i have a spl meter but no test tone right now

I thought that I could level match using yapo? The left sub is set at about 11oclock and the other closer to 10oclock.

When I run yapo individually they both come out to within a half dbl of 0 on the reciver. Hence they are level matched?

If they weren't level matched to listening position then one would end up setting reciver sub to say +5 and the other to say -3 for example

More than likely you are correct and are level matched....using a spl and test tone might dial in a bit, but you are probably close enough. You still should run YAPO with both subs on...this will make sure you get the proper level on the subs, and if they are being EQed make sure the proper EQ is being used.
post #11871 of 15239
Okay thanks man!! No ex. Eq yet but before long i will. Looking into antmode right now
post #11872 of 15239
Quote:
Originally Posted by newc33 View Post

Okay thanks man!! No ex. Eq yet but before long i will. Looking into antmode right now

Some of the receivers with Audessey XT32 (which will EQ the subs well) are dropping in price now...don't know what price you were looking at for the antimode, but if you can upgrade your AVR for about the same price it might be a better overall investment.
post #11873 of 15239
That is true. Good advice! Ya mine only eqs to like 45hz.

Another question.. from what I understand if i run theese subs with 1 port and 14 hz mode my actuall port tune is 12hz right? So if I don't change any setting and just use 2vport mode where am u at as far as port tune goes? I'm gona guess 14hz port tune???
post #11874 of 15239
Quote:
Originally Posted by newc33 View Post

That is true. Good advice! Ya mine only eqs to like 45hz.

Another question.. from what I understand if i run theese subs with 1 port and 14 hz mode my actuall port tune is 12hz right? So if I don't change any setting and just use 2vport mode where am u at as far as port tune goes? I'm gona guess 14hz port tune???

I'll let someone from Rythmik give you an official answer, but from my understanding 12hz is your extension, not the port tune. Using the higher tuning should give you greater output above the port tune, but at the expense of lower extension. Exactly where those numbers lie will be determined by your room, so it is impossible to say what your real world extension is in either mode...just know that a higher tune gives you more headroom if you feel you need it, and if you don't lower tune gives you more extension.
post #11875 of 15239
post #11876 of 15239
Quote:
Originally Posted by newc33 View Post

That is true. Good advice! Ya mine only eqs to like 45hz.

Another question.. from what I understand if i run theese subs with 1 port and 14 hz mode my actuall port tune is 12hz right? So if I don't change any setting and just use 2vport mode where am u at as far as port tune goes? I'm gona guess 14hz port tune???
Don't forget to flip the switch on the amp to change to 1 or 2 ports configuration. You should use 1 port having two subs.
post #11877 of 15239
Quote:
Originally Posted by BeeMan458 View Post

I don't wish to be seen as unappreciative of your posting efforts. These images don't speak to me other than a few words saying you've doubled the number of subwoofers in your Home Theater. confused.gif

What has this action done for your listening pleasure?

(visceral impact and depth of extension)

Story, story.

Everything I read says visceral impact is affected by depth of extension and everything I read says one has to pick one or one has to up their budget, that much more.

(ticks me off)

monkey1.jpg

-
Haven't got a chance to watch a movie loud yet as it was mid night after Auddessey calibration. I did try the WWZ grenade scene at -15 and wow, lots of pressure pushed thru out my room.
post #11878 of 15239
With only running one FV15HP, is running 2 ports recommended? How many of you guys are using 2 ports?
post #11879 of 15239
I'm using one port on my single FV15HP. I do switch back and forth between high and low damping depending on whether it's music or movies.
post #11880 of 15239
Quote:
Originally Posted by Torqdog View Post

I'm using one port on my single FV15HP. I do switch back and forth between high and low damping depending on whether it's music or movies.

I take it high for music low for movies?
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