k145 cones or frankenspeaker?

[89-300ce]

I know these are poor pictures but I would like your impression as to if these are the proper k145 cones or where re-coned with something other.

Thanks

Jorg

[Robh3606]

They look like E-145 cones to me.

Rob:)

[89-300ce]

Thanks. If they are E145 cones does that null their sonic value?

Jorg

[Robh3606]

When you have guestions about 2 drivers like this a quick look at the T/S tables will tell you what you need to know. The K145 and E145 use diferent cone assemblies. The most obviuos diference is the moving mass and other changes in the paramaters. You can get an idea if the cores are the same by looking at the Flux density. Even if this is the same there may be mechanical issues. Then you have the table for compatabillity of cone kits and frames.

http://www.lansingheritage.org/images/jbl/reference/notes/tech1-3a/page09.jpg

They are not the same cone kits for starters and even if the cone kit's fit the flux density is not the same in the two cores. You need to know if the K kits have been changed. It could be OK or an aftermarket.

Check this thread out,


http://www.audioheritage.org/vbulletin/showthread.php?t=15934&highlight=CONE+KIT


Rob:)

[Zilch]

C8RK145 = $240 L/P

C8RE145 = $172 L/P

[rs237]

hello
Apology, perhaps something OT however can say to me someone whether it a sounding differentiated between the two E145 versions gives?

early surround
http://www.lansingheritage.org/images/jbl/catalogs/1984-pro/page16.jpg (http://www.lansingheritage.org/images/jbl/catalogs/1984-pro/page16.jpg)

late surround
http://www.lansingheritage.org/images/jbl/catalogs/1986_pro/b7.jpg (http://www.lansingheritage.org/images/jbl/catalogs/1986_pro/b7.jpg)

regards

juergen

ps. sorry for my bad english

[subwoof]

It should be noted that the distance from the spider mounting surface and the mag gap center is *different* between the E and K 145's so the kits are NOT interchangeable but I am not sure that there is that much response difference when they are loaded into tuned boxes since JBL made it an effort to balance out the T/s parameters so drop in replacement would result in similar ( not exact though ) performance.

One only needs to look at the very different T/S specs between the 2225 and 2226 to see this but JBL did specificaly say that the newer 2226 can "drop in" without retuning.

And the K versions had the different surrounds - the E versions stayed the same but for the dates on the switchover you should ask edgewound.

sub

[Robh3606]

Here are both drivers in the same volume and tuning. 4 cubic ft @40Hz

Rob:)

[caladois]

To be honest, I am not sure that K145 cones are still available> I reconed 5 years ago 2 e145 (old version0, and they went with new cones like yours>

Regards Stephane

PS : I have an other pair of E145 to reconed, and if someone could confirm me that the first version are available, I would really enjoyed to test and compare>

[boputnam]

Here are both drivers in the same volume and tuning. 4 cubic ft @40HzNot so sure, Rob...

Looks like your two models are different - the E-145-8 model is infinite baffle (non-ported), and the K145 tuned as per your post...?

:dont-know

[Robh3606]

Not so sure, Rob...

Hello Bo

Different windows one shows the box the other the driver mounting. The sims are for the same volume and tuning.

Rob:)

[boputnam]

Well, I wondered.

Now it's clear. :)

There was such a vast difference in the models - quite interesting...

[ratitifb]

Here are both drivers in the same volume and tuning. 4 cubic ft @40Hz

Rob:)


What have you chosen for Vas value sim ?

I'm waiting for my E145-8 pair :bouncy::bouncy: like new in the earlier surround version : is Vas the same ?

Is there any difference between E145 and E145-8 ?

Tks

[Robh3606]

There is an error in the published T/S parameters. They are the same drivers. I use 427L Check this thread out

http://www.audioheritage.org/vbulletin/showthread.php?t=361&highlight=145

Rob:)

[rs237]

Hello,

I bought for my Hartsfield project a pair E145-8 with early Surround.
The diaphragms look as from the K145. the MMS of the E145 is 55 grams, applies to the early and the late Sourround? Or the E145 with early Sourround has also a MMS of 75 grams like the K145 ?
Apology for my bad English, I hope one understands me.

regards

juergen

[ratitifb]

Hello,

I bought for my Hartsfield project a pair E145-8 with early Surround.
The diaphragms look as from the K145. the MMS of the E145 is 55 grams, applies to the early and the late Sourround? Or the E145 with early Sourround has also a MMS of 75 grams like the K145 ?
Apology for my bad English, I hope one understands me.

regards

juergen

congratulations :applaud: Juergen for E145 pair purchase (i'm not very surprise you won items !). I bought in the same time the second pair directly with the seller and I'm waiting for (they'll arrive to home (France) tomorrow or next monday ...). Could you confirm they are like new ?

I have probably the same question you have regarding speaker technical data ... so answers you'll get from LH are interesting me too.

Tks to Rob

[ratitifb]

I just received my E145-8 "matched pair" :).

I'm affraid after measuring DCR on both :(, one is 6.3 ohms and the other is 10 ohms ! : seems to be an E145-16 type although K145-8 was white hand written on rear cone and 10 ohms is out of E145-16 DCR range (13.2 +/-10% accordind to JBL spec):banghead:

?????????????????????

note : cone is the earlier type (paper surround) on each

[ratitifb]

I just received my E145-8 "matched pair" :).

I'm affraid after measuring DCR on both :(, one is 6.3 ohms and the other is 10 ohms ! : seems to be an E145-16 type although K145-8 was white hand written on rear cone and 10 ohms is out of E145-16 DCR range (13.2 +/-10% accordind to JBL spec):banghead:

?????????????????????

note : cone is the earlier type (paper surround) on each

please see http://audioheritage.csdco.com/vbulletin/showthread.php?t=17413:D

[ratitifb]

Hello,

I bought for my Hartsfield project a pair E145-8 with early Surround.
The diaphragms look as from the K145. the MMS of the E145 is 55 grams, applies to the early and the late Sourround? Or the E145 with early Sourround has also a MMS of 75 grams like the K145 ?
Apology for my bad English, I hope one understands me.

regards

juergen

please juergen get the right place in that thread

[ratitifb]

I bought for my Hartsfield project a pair E145-8 with early Surround.
The diaphragms look as from the K145. the MMS of the E145 is 55 grams, applies to the early and the late Sourround? Or the E145 with early Sourround has also a MMS of 75 grams like the K145 ?


No answer ? :p

[rs237]

no, unfortunately not. I have a speakertester software ordered, and will measure my E145,

regards juergen