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noremacyug's sub (eclipse SW8200) - Page 2

post #31 of 186
What kind of levels are you reading, using your SPL meter? To be honest, I think that your amp just isn't enough for that driver.
post #32 of 186
Thread Starter 
how do i need to check it? with just the sub running? scale set to C?
post #33 of 186
Thread Starter 
popped in the matrix. in the first scene where they are cuffing trinity, recievers main volume set to 70 (80 is the max), spl meter set to C scale and slow it ran up to around 106db.
post #34 of 186
Where is the sub located in your room? Sitting it away from any bounderies is a serious no-no here. You'll want to try and corner load this thing. If possible place it next to two strong walls along the front of your soundstage (sometimes the rear works better depending on the room). If its an option, tell us if there are any improvements
post #35 of 186
Thread Starter 
already in the corner. thanks though.
post #36 of 186
D'oh!
post #37 of 186
Tha amp specs as:
180W 8 ohms stereo

300W 4 ohms stereo

450W 2 ohms stereo

600W 8 ohms bridged

900W 4 ohms bridged.

These numbers look a little to right. It sounds like the amp really doesn't like the 2ohm load.

The 12" driver is rated at 670W, so you should still be OK.

How far away were you measuring from? We need a number 2 inches from the driver and at your seat.

You might want to try removing a 1/2lb of stuffing just to make sure it isn't over
stuffed.

Have you tried turning the GCL off?
post #38 of 186
Quote:
Originally Posted by noremacyug View Post

popped in the matrix. in the first scene where they are cuffing trinity, recievers main volume set to 70 (80 is the max), spl meter set to C scale and slow it ran up to around 106db.

That's great readings, try tunning some sweeps and make a FR graph.
post #39 of 186
Thread Starter 
Quote:
Originally Posted by soho54 View Post

Tha amp specs as:
180W 8 ohms stereo

300W 4 ohms stereo

450W 2 ohms stereo

600W 8 ohms bridged

900W 4 ohms bridged.

These numbers look a little to right. It sounds like the amp really doesn't like the 2ohm load.

The 12" driver is rated at 670W, so you should still be OK.

How far away were you measuring from? We need a number 2 inches from the driver and at your seat.

You might want to try removing a 1/2lb of stuffing just to make sure it isn't over
stuffed.

Have you tried turning the GCL off?

i was measuring from my seat approx 12ft away. what 2ohm load are you speaking of? the driver is rated at 4ohms. i have tried turning of the gcl a few times, no difference. i'll try to get you the 2inch reading later. i'm going to pull the driver, remove a 1/2lb of stuffing and then try to really "fluff" up the remaining stuffing.
post #40 of 186
Thread Starter 
Quote:
Originally Posted by crackyflipside View Post

That's great readings, try tunning some sweeps and make a FR graph.

so i'm getting good results, cause they sound okay, just not loud enough. where do i obtain the tuning sweeps?

i'd like to make a graph via roomeq wizard, but i keep getting an error message saying "your java vm needs to be upgraded before this program can be run." i've updated java with the link the error message supplied and still no go.
post #41 of 186
When bridged to a 4ohm driver each amp channel gets half the load, so each channel is ran at 2ohm.
post #42 of 186
Thread Starter 
so does the am essentially take the 450x2 @2ohms and put it in series to create a 900x1@4ohm? in any event, the amp is rated for 2ohms, but i suppose that doesnt mean that it would handle it well.
post #43 of 186
I'm assuming the 106db was the sub only without the mains.
post #44 of 186
Quote:


so does the am essentially take the 450x2 @2ohms and put it in series to create a 900x1@4ohm? in any event, the amp is rated for 2ohms, but i suppose that doesnt mean that it would handle it well.

Yeah, pretty much. I think I have two threads mixxed up though. I thought your amp was the one that shut off with Batman. I think you are fine bridged wise.
post #45 of 186
Thread Starter 
it did kick out the amp a few times in batman begins.
post #46 of 186
Thread Starter 
Quote:
Originally Posted by soho54 View Post

I'm assuming the 106db was the sub only without the mains.

no, mains too. that was i was wondering, if ya'll run your mains with it or not during testing. i'll unhook the mains and see what it does.
post #47 of 186
I'm just going to throw some stuff out there, it might be useful it might not.

With a single 12" driver you are usually limited to 110-113db max. With the speaker in the corner you should be able to get an extra 9-18db. At 12ft it should take about 800w to generate a 106db signal at your seat without room or boundary gain with a 89 db 1w/1m driver. The Inverse Square Law teaches us that for every doubling of the distance from the sound source in a free field situation, the sound intensity will diminish by 6 decibels.


Here is a tone generator, please use the sine waves only sine wave generator
post #48 of 186
Thread Starter 
ok, retested. same scene of matrix. C weight, slow response on spl meter. sub only, main reciever volume at 63 (80max). ~104db at approx 12ft (couch) and 126+db (meter tached out) at the ~2-3inch position.
post #49 of 186
104dB from a single 12" sealed sub, from over 3.5 meters away is nothing to laugh at.

Try what soho suggested.
post #50 of 186
Thread Starter 
ok, got the generator. it works fine, pretty neat tool too. what do you want readings of?

also, i already pulled out the driver, and reapplied the stuffing as per the instructions (i really should read those things more often) stated to do. however, it's made no real difference. i think i may pull the driver again and remove a considerable amount of stuffing to see what effect it has.
post #51 of 186
Quote:


ok, got the generator. it works fine, pretty neat tool too. what do you want readings of?

80hz, 60hz, 40hz, and 20hz from up close. Without the amp clipping. Remember to only play the tones in short bursts (few secs) at a time.

Quote:


however, it's made no real difference. i think i may pull the driver again and remove a considerable amount of stuffing to see what effect it has.

No need. If you didn't notice anything the first time it was fine to begin with.
post #52 of 186
Thread Starter 
ok, i'll get those readings here real quick. do you want the maximum that it will produce at each freq before audible distortion or keep the same volume setting for all different freqs.

and as for the stuffing, i didn't remove any the first time but rather rearranged it. originally it was all just kind of laying in there. i then read the magical instructions, happened to actually have some spray adhesive (not sure where that came from) and then applied it to all the walls except the front wall on which the driver mounts.
post #53 of 186
Quote:


keep the same volume setting for all different freqs.

Yes.

Also just pick a volume right before the amp clips at 40hz and use that volume for all measurements, or something similar.
post #54 of 186
Thread Starter 
-all reading taken approx 3-4 inches from driver
-signal was started and volume was slowly increased until meter would read no higher or distortion was heard.

-80hz-126+db (pushed the needle as far as it would go)
-60hz-same results as 80hz
-40hz-Same results as previous two
-20hz- ~124-126db 124db was pretty clean sounding, 126db showed some distortion
post #55 of 186
It looks like you are driving that 12" for all it's worth.
post #56 of 186
Thread Starter 
second set, same distance volume on reciever set to 61 (80 max), crest gain set to 1 notch below 1/2.

-80hz-124db
-60hz-126db+ (meter tached out)
-40hz-126db+ (meter tached out)
-20hz-118db
post #57 of 186
Can you do the second set again from your seat?
post #58 of 186
Thread Starter 
Quote:
Originally Posted by soho54 View Post

It looks like you are driving that 12" for all it's worth.

ha, i aint skeered.
post #59 of 186
Thread Starter 
readings from seat (front of sub cabinet to my head is approx 13ft)
reciever volume- 61 (80max)
crest volume- 1 notch below 1/2

-80hz- 96db
-60hz- 108db
-40hz- 99.5db
-20hz - 98db
post #60 of 186
That sounds like pretty impressive performance to me...honestly.

You should try room-eq and run a sweep to see what kind of FR you are getting.

http://www.hometheatershack.com/roomeq/
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