Originally posted by DavidF
Second is use the same approach above but using recorded white noise available on test CDs. This may be easier to tell when one speaker is louder over the other.
only one problem: the 2 pads mid/high is for the same driver.
and where can i get the noise? can i download it somwhere and burn it onto a cd?
i found the eq! itīs a jvc sea80 with rackhandles! heavy hu?
well it shure has some features: 2*10 band, spectrum analyser and so on.
but check this out! it has PINK NOISE generator for L&R channel and a mic input that u can hookup a mic and run the noise and it shows a graph right in the display! u simply fiddle with the bars til the graph is flat....cool! but probably not very reliable?
im shure gonna give it a try though!
Last edited by Figge; 07-24-2004 at 07:57 AM.
You can use a PC as your entire measuring set-up. You can get a noise source on CD to. Almost any test CD has Pink Noise bands so you can see what the room response is on an RTA. You can get True RTA for free. Then you need a measurement microphone. I use the Behringer it's inexpensive. You should be able to use it with your EQ but if you go with the Behringer you will need a phantom power source. There are several of those around I got a Crown PH-1A for $24 delivered off E-Bay. I have an old ADC Sound Shaper RTA that had a small battery powered microphone sound like yours is a similar set-up. If it working you should be able to get what you need done. I used the 10 band Sound Shaper for years and it correlated very well to the Behringer. If I remember right white noise is broad band and a constant amplitude with frequency. Pink noise is rolled off to compensate for the increased frequency range each octave covers. If you look at pink noise in say Cool Edit it rolls off. On an RTA which looks for power/level distribution octave to octave its flat.
Rob
Last edited by Robh3606; 07-24-2004 at 05:53 AM.
Simply put, white noise has the same power at all frequencies and pink noise has the same power for each octave. As a result white noise sounds brighter. We use pink noise to balance a sound system to generate a "flat" response.
Flat response is a bit of a fantasy though as rooms affect the sound and even air has an effect. High frequencies roll off with distance from the source due to air loss (friction) so a speaker that is ruler flat at 3 feet will not be ruler flat at 30 feet.
Widget
Figg,
If you download the 4430 data it will help you understand what the contols do.
The contols effect the 2 Khertz zone and the 16Kherts extension.
The ffect is enhancment of midrange imaging and HF spatial ambiance.
This monitor is very smooth and should need little Eq unless you have significant room relections etc
I am surprised to have this problem with the 4430's. The problem could be the CD player?? Also are you Bi amping.
When I heard John Nebel's 4435's it was with NO Eq and they were silky smooth and sweet no matter what we played
How are they set up? For home use you may find placing them equidistant from the side/rear walls and towed in a bit, but not too much.
Try a different CD player, I doubt if the RTA EQ is the solution. Also check the conditon of the compression driver.
Ian
Last edited by Ian Mackenzie; 07-24-2004 at 06:04 PM.
Originally posted by Ian Mackenzie
This monitor is very smooth and should need little Eq unless you have significant room relections etc........How are they set up? For home use you may find placing them equidistant from the side/rear walls and towed in a bit, but not too much.
i can imagine this being the two major problems to work with. maybe i need to get em out of the livingroom and in to a separate "hifi-only" room.
its not a very high "WAF" on working with room reflections in the livingroom!
if the drivers were damaged in some way it should be heard very clearly? or maybe i should pull the horns and see just in case?
I am not familiar with your 4430 acquisition.
Were they tested when purchased?
You could refer to one of the members who has experience with driver diaphragm fatigue/ damage.
If they are old or damaged it would certainly effect the HF performance.
Try another room and see how it goes but don't get your balls ripped off trying. Use the enclosure as a base for a nice Vase.
Ian
Originally posted by Ian Mackenzie
You could refer to one of the members who has experience with driver diaphragm fatigue/ damage.
ok! how do i see if its damaged. wouldnt it be a distorted sound in whole range of the driver?
guy i bought em from claims they are 1989:s and my guess is its the original diaphragms in there.
so it could in fact be as simple as to change diaphragms?
iīll pull the horns and see how it looks in there...seems like a good start, then move on from there....probably end up throwing the cd:s and player up on ebay
Last edited by Figge; 07-25-2004 at 09:34 AM.
ok! pulled!
it appears as they are not as claimed 89:s must be earlier? 2421A
back of the diapragm! looks allright to me!
and pulled diaphragm!
i really dont know how to se if its fatigue...
this is original...i can tell. all screws holding the horn were untouched!
Last edited by Figge; 07-26-2004 at 04:38 AM.
Hey,
They look nice, Can I swap you for my 2425 diaphragms? (joke)
I am not able to comment if good or not.
Ask the Widget he may know.
Ian
and the other one!
this speaker has been screwed with!
Last edited by Figge; 07-26-2004 at 04:37 AM.
back of it!
these are 210 dollars each here in sweden! so they better not be damaged or tierd!
does the black marking at one of the screws indicate + or minus?
i found that they were wired diffrently inside the drivers!!
this must be corrected!
Last edited by Figge; 07-26-2004 at 05:02 AM.
this howerer i find strange!
the other driverback is totally flat look at the other pic:
this one is not flat.
is this normal?
Last edited by Figge; 07-26-2004 at 04:40 AM.
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