MoD is playing with the Lansing heritage :-)

[MoD]

Burn hiiiim! Blasphemy!!

Well I do it out of love...

As I wrote in this tread

http://www.audioheritage.org/vbullet...m-a-new-member

It all started with JBL K(D) 130.

I got them (K 130) in really rough shape and recone them with D130 recone kit.

[MoD]

First try was in some box which was laying in storage. Way to small box, but potential was there.



Soon on this site I found plans for appropriate enclosure and built one test sample. It wasn't bad but it was humongous.

[MoD]

Diy worm forced me to boy a pristine pair of 2227 drivers , I have also dig Phonic PA active crossover and Peavey CS800X amplifier. Crossover point is now 500Hz, and with no passive elements sound is much better. Except hi tones. In this setup there is no good way to boost hi tones. I should get some DSP...




Peavey soon started to drift with DC offset, so I took him apart and started a refresh , and so...



Capacitors are leaking, and I will replace all electrolitic capacitors everywhere in the amp.
This is the test of power supply filter capacitors, the rest is no better, and they have lost capacitance...

[MoD]

I decided to build a pair of 4530 horns. Those are intended to be also test enclosures so it was imperative to keep the costs at minimum. I also acquired two 075 hi tweeters to replace Motorola piezo ones.






In order to get some waf I painted the speakers.

[MoD]

I was wondering for a long time...; How about some nice big bass horn. So, I took for start Jensen Imperial bulit in, and heavily modified it for D130. I call it MoD's Imperial MK1 During last year from local recycling yard I was collecting bigger pieces of furniture partical boards, and last week I have built one.

[RMC]

Hi Barry,

Thanks for the reply. We're all doing ok, hopefully your family too. Winter is slowly fading away here though still -10 C some nights...

We're not virus sick so that's good news nowadays when you have a look at TV. Doing income tax returns these days for family members. Got about a month of that. Not my dream work, gets a little more complicated every time, but somebody has to do it, and I'm unanimouly de-sig-na-ted for the yearly task. If I get some money back from the tax man when doing mine last, then it might go towards something audio, my reward...

The New year's or so gift I gave to myself is still stashed under a table in basement living room, haven't had time to play with it, wife hasn't noticed it yet! maybe better this way.

Btw I'll send you a PM for something else. Regards,

Richard

[MoD]

This is where I really get on this, although there is no much bass below 60 Hz, I really liked those speakers.












After initial enthusiasm, I was beginning to see potencial for improvements so I bought pair of 2445 compression drivers. Now, that opened a Pandora box, and soon I was buliding test horns. I liked the most truncated tractix 300 Hz horns, so I use test example to made mold for fiber-plastic.

The rest in tomorrow tense part of this story... :-)

[macaroonie]

Excellent Zilch would be proud of you

[MoD]

Oh, it sound marvelous! Some fine tuning should be done, so it will be even MK3 version but I love it! Nothing beats big bass horn!







https://www.youtube.com/watch?v=gTinH3QSk5g

https://www.youtube.com/watch?v=rFy64JSUO7I

[Earl K]

Wow MoD!

Very Impressive!

Yes, I think your 075 tweeters need to have installed some new ( 077 ) diaphragms .

[Kay Pirinha]

Hi MoD,

I'm very impressed, too, especially on your fibreglass/resin outcome. Your first mold might have been sticking due to it's surface which possibly might not have been smooth enough. But this is just an assumption, you know?

Btw, in that other thread you've told that you've reconed K-130 baskets with aftermarket D-130 kits. Why? Aren't there K-130 aftermarket kits as well? Optionally you could have reconed them as K-140's, which aren't that sensitive, but provide much lower bass. And agreed, genuine kits are prohibitively expensive .

OTOH and as yet said, a musical instrument driver most probably isn't the first choice as a HiFi speaker. Hence you might also have dropped 2205 recones into your alnico baskets which most probably will suit much better for your needs. Give your pristine 2227's a try also in your smaller bins and you'll see what I mean .

Best regards!

[MoD]

I agree, original is original.

But...


K130 which start my story with JBL came to me in a trade (read: cheap). They went to storage and i went to internet. I liked what I read/hear. Ok, not all. Price wise idea was way above my range. So they sat on shelve for few years. Until, one day I said to myself; screw magnet recharging, screw original recone kit. No risk no profit, so I bought recone kit for D130 from Sound speaker repair, kits arrived, they looked good. As aviators used to say: If it look ok, it is ok. So they were reconed.

I do not think that my speakers sound the same as they would sound with recharged magnet and original recone kit. That said, i should say that i have never heard good original D 130. I have learned from this and other forums, asking people who had experience, listening D 130 on you tube (yeah, I know ) about sound which is to be expected from D 130, and I have build mental "picture" of how they should work. And they fulfilled my expectations.

My conclusion is that for some models there are aftermarcet recone kit which for money gets big procentage of original sound.
I forgot to look at Sound speaker repair for 075 diaphragms when I wrote post about diphragms , but it looks that they are spending some effort to get a decent replacement par, and because of good experience with D130 recone kits, I think that I should risk hundred dollars for a pair of these:


http://www.soundspeakerrepair.com/mm...y_Code=DIA-JBL


It is going to make my 075 franken tweeters but all I need is good performance from 6000 Hz to 16000 Hz. No guts no glory :-)

[MoD]

After a while I am back.
@ RMC, 1audiohack, thank You for input about La Scalla and 075.

I have ditched idea about La Scalla, it is too short horn to expect bass output i desire. I am thinking about reconstructing MoD Imperial in front loaded horn, once in the future.

I have allso spent some time analysing my 075 problem.
I have come to conclusion that inside my 075 are some chinese diaphragms which only look ok (from distance ) and that explain measurement i have on them on second page of this topic...

Time for new diaphragms...
Which one would You recommend?

I am in doubght on these, those are for 077 and I would have to make shims for phase plugs...

https://reconingspeakers.com/product/jbl-2405-aftermarket-diaphragm-16-ohm/



They look ok, but...

[ivica]

After a while I am back.
.....
I have allso spent some time analysing my 075 problem.
I have come to conclusion that inside my 075 are some chinese diaphragms which only look ok (from distance ) and that explain measurement i have on them on second page of this topic...

Time for new diaphragms...
Which one would You recommend?

I am in doubght on these, those are for 077 and I would have to make shims for phase plugs...

https://reconingspeakers.com/product/jbl-2405-aftermarket-diaphragm-16-ohm/

They look ok, but...

Hi MoD,

I have bad experience with 'aftermarket 2405' diaphragms, I would not suggest You to waist your money.

Regards
ivica

[1audiohack]

That’s quite a journey, lots of fun and good work!

Barry.