Only thing changed is cone, foam surround and the area around the tweeter (spider?)... Coil is original and tweeter us original... Cone was 15" and cut down (carefully!) to 14"....
Only thing changed is cone, foam surround and the area around the tweeter (spider?)... Coil is original and tweeter us original... Cone was 15" and cut down (carefully!) to 14"....
Right, that's spider the other speaker used as guardalpolvo in this repair. Two have corrugations, but obviously not offer the same strength ..
In your case, we have two spider, instead of a spider and an overall original.Trash099 speaker, who has done the work? You?
Here we see the voice coil with spider respective
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Comments on the crossover slope and capacitors employees
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no i did not do the work - a guy in oz who built quite highly regarded guitar amps did the work…. it will be very interesting to hear these speakers after all the work i will do on the cabinets. i plan on replacing the internal stuffing with acoustic insulation (50mm) on all panels (but not baffle) and maybe even cut out odd shapes of the insulation to stick to the walls as well to help break up reflections. i think this will be the most significant upgrade even more than replacing the caps in the crossover network……
Hi trash099 :
I agree not much progress in improving the xover as long as there is not much away correpsondiente value of 6.0 microfarads. Easy to check with a tester that has capacitance meter.
Also I think proper acoustic treatment planned for inside the enclosure.
As observations, I think it would be interesting to measure a parameter T / S which has been modified in the bass cone, the resonant frequency (Fs) and redesign the tuning tube according to the result. This directly influences the quality of the bass.
And a comment:
The maximum power LE14C be taken as 35 Watts (real - RMS) which is what supports the tweeter.
I use with higher power amplifiers (75 watts / channel) but indoors and never in volumes "deafening".
Please do not take seriously what I said listen loud "in the garden" would be very dangerous for tweeters, not the midrange/bass cone - , voice coil 4 inchs it does support higher power.
Regards
Back in 1978 I built the boxes for the JBL LE14C following the verbatim form of measures and armed with internal bracing, plywood panels and all gluing.
The only change was the design grid for web, but I thought was a nice aesthetically, I wanted to finish the job quickly and listen to boxes with the anxiety associated with my first job with high quality speakers and prestige. So were made simpler.
Argentina marks of those years had already passed through my hands, Ucoa, Audifiel, Leea, etc. .. The latter with designs copied from Altec Lansing expired patents the years 40/50.
The dimensions of the tube box tuned to 85 liters are:
4 inch diameter by 3 inches deep.
A friend "very knowledgeable" recommended me to lengthen the tube to achieve low with a little more "punch".
Willing to see if the sound would achieve my liking, I did some hearing tests once assembled the boxes, with various lengths of tubes, and indeed, the bass changed, "beat" a little more.
For my musical tastes at the time - mostly rock, Deep Purple, Pink Floyd, Led Zeppelin, Yes, etc. - I thought it was great advice and so enjoyed until a few months ago from them. With alternating periods with other brands, JBL sound always seemed more transparent and real, that's why I kept until today.
It was love at first sight .....
Continue, my apologies, I use the translator and a bit slow writing, but what a great help!
I had one of the capacitors measured and it was 6.3uf....I am replacing with jantzen superior z capacitors... I have put new binding posts and will be lining the cabinets with a good quality acoustic stuffing. I mainly listen to rock as well and think that the le14c are good for this type of music. I am using a redgum amp (australian brand) which drives them well I think, but it would be nice to hear them with a tube amp
This is the amp you have?
http://www.stereomojo.com/REDGUM RGi...fierReview.htm
155 watts rms per channel are enough to achieve more than 100 db in a closed environment of household size.
But there is risk of damage if you decide to try "how strong is heard", remember my comments about the JBL-LE20 tweeter. (In the coaxial design has good efficiency, being within the large cone, it acts as a horn, you do not need great power, but is good to have more (favors listening to recordings with good dynamic range)
Here you can read about it:
http://www.troelsgravesen.dk/JBL_LE20-25.htm
I currently use the JBL LE14C a Prima Luna tubes of 38 Watts/ channel in push pull .
I will read the whole article, I like the design!
Trash099, what's your name?
I am Rolando, Rolo for my friends
Hi Rolo, my name is Matt.....
the amplifier I have is this one -
http://www.digitalaudioreview.net/20...ted-amplifier/
Its a good review of it that will give you an idea about how it performs
Originally Posted by thrash099
Hi Rolo, my name is Matt.....
the amplifier I have is this one -
http://www.digitalaudioreview.net/20...ted-amplifier/
Its a good review of it that will give you an idea about how it performs
" When cross-referenced against the REDGUM amplifier range proper, the Sonofa’GUM 5500 sports a 180VA toroidal transformer (similar to that of the RGi120). “The SG-5500 is rated at 55WRMS into 8 ohms, it is chunkier than the RGi35 (35+35WRMS) but it could be described as not being as poised as the RGi35 due to the SG-5500 using a conventional power supply. (In the REDGUM range, its own UltraFlex power supply is certainly not a conventional design and so the greater Transient Power available uncovers the musical magic so often left hidden on a disc by other designs.)”, Gerber added. "
Hi, Matt, I think that is the right power for LE14C enjoy!
We hope your comments when you finish the work of the boxes.
A friend lost contact which went to live in Australia, I was amazed with the country.
But it does a lot of this, at that time there were kangaroos everywhere yet ....
Regards
Rolo
Hi rolo,
the red gum drives them easily, it does not take a lot of power to get them singing…. this is what i am lining the boxes with- http://www.acoustica.com.au/echosoft.html
i am using the 50mm. i may also cut out odd shaped pieces to glue randomly inside to help prevent reflections. i will post some pics shortly. i ended up getting some jantzen superior z caps (after your recommendation) which i may have to mount outside the crossover box as they are a little large.
im in sydney so not many kangaroos
regards,
Matt.
Hummmmm ......
It is not suitable material for cushioning ......
Must absorb but no cancel the sound, just can read the opinion of a specialist Jantzen here:
http://www.troelsgravesen.dk/JA8008_DTQWT.htm
You can see the photo of what you need
" If you want to source damping materials locally, please do not ask where to buy and what materials are suitable. I have not been able to find e.g. felt material at the usual diy speaker suppliers around the world. 10-12 mm polyester foam can be used, but pay attention to the physical properties of damping materials, some are not specifically meant to absorb sound, rather absorb vibrations from panels, etc. Do not use damping materials having a smooth outer surface like damping sheets for cars, etc. These will reflect sound and are not suitable.
"
The capacitors look very good!
Regards Matt
Rolo
these are not smooth on surface or for damping - they are like dense polyester fibreglass so i hope will be suitable
i know of people who have used this successfully for room treatments (bass traps) so i assume it would be good for cabinets as they are just like little rooms!
Mine are done - had to add little more polyfill to the cabinets as they sounded a bit boxy- like the vocals were far away - once I did that they were great.... Except that one seems to have lost treble response so I will check all connections but once that is sorted they will sound great
As they say the general rule is to check the most obvious thing first- a wire had come loose on the tweeter inside the cabinet.... They now sound great - overall clearer sounding, bass is lower and treble seems to be a bit brighter which is welcome. They sound a bit more lively which is cool, well worth the effort
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