Help Needed to adjust 4312

[ngccglp]

Hi,

I know the crossover freq for the 4312 is at 1.5 kHz and 6 kHz, but I am not really sure what instruments freq falls under which band of the audio freq spectrum, therefore I am having a hard time adjusting the mid and treble pots to suit my room (also don't quite understand what presence and brilliance means).

I would like advice on which pot (mid or high) should I adjust for the following instruments (I know some instruments spread across a wide spectrum, but I'm looking for the dominant spectrum in general) :

female vocals
saxaphone
hi hat and cymbals
snare drum
keyboards
electric guitar

I know this sounds crude but hopefully this info will help me fine tune the 4312 to my room. Currently it is too bright, but when I turn down the pots, some music lacks life etc.. I have been going to and fro without much success.

Thanks
david

[Zilch]

Brilliance is the HF pad, Presence is the MF pad.

Somebody posted a cool link here recently which showed the frequency ranges for various instruments and voices. I looked, but can't find it for you.

Bo?

There's also a thread on adjusting L100 controls, with several approaches described. Use "Search" to find that one....

[Mr. Widget]

This is a very subjective area. It really is a case of when it sounds right it is right.

"...also don't quite understand what presence and brilliance means."

Presence is refering to the forward or recessed sound quality from bringing up or turning down the mids... Brilliance is refering to the highs as in extra brilliance would mean sound that shimmers or is overly siblent.

Try setting both controls to the mid point of their rotation or 0dB if so labled. Try balancing the mid control (Presence) with the woofer first. When it seems natural try balancing the high control (Brilliance). Typically this will be a bit over bright when set at the mid point or 0dB. I find -1dB may be better.

Widget

[ngccglp]

Thanks guys. I did search for 4312 but not L100 . Now I found the tread on L100 controls and printed the manual from Giskard. Will experiment later.

[Don Mascali]

http://www.dplay.com/tutorial/freqpaint.html

This has a chart with various instrument frequency ranges.

[ngccglp]

Just completed adjusting the controls, but my readings are lower than most forum members. My mid is at 2 and High is at 3 (scale is 0 to 10). This could be due to: 1. My speaker is about 1 m from the rear wall and I'm about 2m away from the speakers, 2. I'm using naim amplification which is forward sounding.

The chart is consistent with what I heard. I was surprised to discover the 12" woofer is producing a large proportion of every instrument, no wonder early JBL brochure says it is the heart of the 4312. I love the speed of the woofer, it is very fast and drums really has weight and snap. With the mid and Highs turned off, the music is still quite enjoyable. I slowly added the mid to add definition to the sound. Lastly I added the treble and tested it with vocals to check for sibilance and classic jazz to check the sparkle of the cymbals.

If 5 is the factory default, then I think I have a major system mismatch.

[4313B]

Try not to get too caught up in what is default. Adjust to your taste and enjoy. I distinctly remember running more than one pair of JBL's with the mids and highs in the "2" to "3" range.

[Guido]

If 5 is the factory default, then I think I have a major system mismatch.

Back to your initial question

I recently reworked a 4310 network and adjusted it to flat response.
Presence was 4 and brilliance was 5 at the end.

Sounded NOT right for me. After adjusting it to my hearing preference Presence was 3 and Brilliance was 2 at the end.

So, as Giskard wrote: Adjust to your own needs. Those old control monitors are a bit to forward at default settings.
Somewhere is a tech note regarding this subject "....choosing the right studio monitor...."
Have a search.

[B&KMan]

Hi,

I would like advice on which pot (mid or high) should I adjust for the following instruments (I know some instruments spread across a wide spectrum, but I'm looking for the dominant spectrum in general) :

Thanks
david

bonjour bonjour (hello)

Sorrry for poor english.

Your problem is the same of all Lpad member of JBL communauty...

this is one point who guy tried and tried and tried and turn crazy... Why...

I tadd my voice for little explanation of few tip for more comprehension phenomenon...

The balance tonal is probably the most factor where minimum deviation is critical. In regards on the prev post, any harmoniques construction is affected, cable, macth component , position, angle, current, all affect this point. But the big major influence is room:

1--- the reverberation time and the linearity of this time at all frecuency affect dramasticely the tonal balance. (this is the first reason is impossible to give a receipt experience) to live area = put down pad) dead or big damping area = more higher pad...

the professionnal set-up is run pink noise in full range and keep multiple average positions around your sweet-spot.

YES dispendious but the difference is wow... more details more realistic, more everything...
Never your ear is equal this set-up... but if you play instrument; record you with reference material (the ultra flat response mic is critical) and playback on your system :-) the flavor, tone and acoustic detail is easy referenciel...

2--- the first 3 modal respons of room (in low frecency ) affect drasticly the tone and blend with the first problem ...

3--- if you listen the record, you have no information of acoustical response in recordind session and you have not idea what is right, of course the coarse placement is possible, but other record other set-up... and again a again change...

I remember the close to realistic set-up pad is possible with one slm and little sofware play a frecquency cut. You put your slm in 1.5 m in half position between two driver. play only one driver and check you slm value... add the second driver pad just just the vale is exact 3 db higher. the slm is no displacement and fixed in stand and your position is ideally same place but over a 1.5 m distance of meter. this is a good average position pot. probably 1 or 2 indent max deviation...

Good luck

Jean

[ngccglp]

Thanks Jean for the explanation. I think I will try to use pink noise the next time I meddle with the controls.

Q - To get pink noise I just need a tuner and not tune in to any station?

[Alex Lancaster]

You´ll get "white noise"; for pink You need a generator, lots of equalizers and RTA´s have them.

[Don Mascali]

http://www.nch.com.au/tonegen/

This site has an "evaluation" download of a tone generator that has pink noise and various wave forms. Can't beat the price.

[B&KMan]

Thanks Jean for the explanation. I think I will try to use pink noise the next time I meddle with the controls.

Q - To get pink noise I just need a tuner and not tune in to any station?

NO !!!

This type of FM generator sound is not consistent, maybe white, maybe pink not not equally in all band... but manys trace of other signal of other stations or interferences is hiddend by noise but false result.

The RTA is mesure the pink noise but if you have a Power Spectrum Density or Energy Spectrum density who have a set-up correction to mesure white noise...

the pink noise is easy to found in CD or in small freeWare on WWW the RTA and especially the mic is realy to hard and dispendious: couple of tousand US box for prime grade...

But the best is little sofware Is generate the sinewave or frequency cut and slm (anyway the quality, in half distance of the 2 driver... at 1.2 m you deliver a good average fine tune with hear... but no more one or 2 indent...

happy test...

[ngccglp]

Today I had time, so I moved the speakers to another room where I can postition the speakers nearer to the rear wall. What a difference it make! I was able to return the presence and brilliance setting back to the mid position and it was just about right. I think the 4312 needs a bit of back wall reinforcement to balance up the low frequency. Yes I lose a bit of the bass defintion but the overall sound is more balance. Cool!

[B&KMan]

Today I had time

HA AH !!

Well run the tuning in your ear...

in regards of your listening position:

check the level speaker incoherence is broken the image and the smash bass.

check carrefully the toe innner angle of speaker:
each very fine toe in altering drastiquely the focus and tonal balance...
10 to 15 degree is appear best..

check the symetrie for snap sound.


and check your listening position if your forward or back the tonal balance and snap is big change in regards of standing wave in room and the modal response combine at the effect of echoe amplitute and lineariry in regards of each location of material damping...

the room is the biggest factor is influence and modalise your response. so work work work..... more precise work more result great...



after your determine what is the spot where the less problem acoustic are, and focus and dymanic, now play your LPad for fine tune.

and restart over all again finest spiral tuning. and voila...

Oh I omit the spearker tuning is work in all dimension of the room so try different elevation of speaker and probably big surprise in regards of bass tuning...

the go good start principle is the premium number division of room size because it is minimise the standing wave... is not perfect but good start...

try a manual instruction of couple of JBL Speakers for coarse placements...