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Sorry if this is covered somewhere, but I couldn't find it by searching.
I'm a big Deadhead, in a Dead tribute band, going for that vintage 70's Dead sound... including lots of JBL Speakers. My research says that for bass (my instrument) they used a lot of D140s. I've just been given a pair of 2220As, which leads me to my question:
If I have the 2220As reconed to D140 specs (ribbed cone, aluminum center dome) will it sound the same and have similar T/S parameters?
D140 has stronger magnet.
Ron
As Ron said, :no:Quote:
Originally Posted by Rusty the Scoob
Decades ago... yes during the '70s I did that very thing... it had a different sound.
Widget
Why not stick those 2220A's in to a pair of 4530's to get your 70's sound?Quote:
Originally Posted by Rusty the Scoob
the 2220 magnet / cone is unique and cannot be interchanged without really affecting the performance. The gap is deeper and any other cone kit will not center properly.
If you changed the cap to an aluminum one, you can use it in a bass guitar / slide guitar rig - it has a heavier copper coil than the aluminum 130 and sounds a bit nicer on the fat notes. But watch the power since these are only 100 watt speakers if they are alnico.
Ah the scoops...my first set of cabs and I had 2220's in them back in '78
lost my first lease too.
sub
In college... well one of many, I rented a small house from an attorney friend of my dad. I was there one week and he came by to see how I was doing. He commented on the pair of six foot speaker stacks (you're damn right they were JBL) in the dining room. The next day I received a telegram instructing me to remove my sound system from the premises as it was an "attractive nuisance". :blink: While he may have not appreciated the aesthetics of a pile of black boxes, I think he was worried about the parties that they surely would inspire. :DQuote:
Originally Posted by subwoof
I moved a week later.
Widget
Rusty,
Basically the 2220/K130/E130 is a speaker with a lightweight cone, light aluminium coil and is high efficiency. The 2225/K140/E140 has a heavier cone and copper coil, more substantial suspension and can take more of a pounding, but at the expense of lower efficiency, up to 4 dB lower.
The 2220 can do good bass only in large enclosures and normally horn types like 4530, 4550 or 4560. They are normally used in bass/midrange applications.
The 222* series with the paper dome is similar in characteristics to the D/K/E series with aluminium domes. Often, people find the aluminium dome gives brightness they like on bass and guitar, but the 222* series with the paper dome is smoother and preferred for PA and monitor speakers.
If you want to pop the drivers in small ported boxes, then the 140 version is preferable.
The E140 is similar to the 2225 and the D or K140 to the 2205. Any of those models will work well in ported boxes of 2 to 5 cubic feet.
I have a friend with a pair of original, perfect D140's he'd probably trade for a pair of like condition E140's or E145's if you're interested.Quote:
Originally Posted by Rusty the Scoob
John
Please confirm a statement before you post. You still have time to correct it.
The 2220 has a COPPER voice coil *not* aluminum and the specs are here:
http://www.jblproservice.com/pdf/Dis...els/2220HJ.pdf
Also if you look at the JBL technical notes, there is a specific one entitled "choosing JBL low frequency transducers" that addresses all the comments in this thread. Vol 1 number 3
JBL has buried it with their new search engine but it's there somewhere.
sub
I'm not finding it on the JBL Pro site.Quote:
Originally Posted by subwoof
Anybody have a link?
How 'bout an upload to the Library Annex? :dont-know
Yeah - the old pro notes were on an obscure page but it is no longer...
My best friend who was going to help me .pdf this pile of JBL lit died last month so I need to get another source with time to help me with it.
Meanwhile I will ask at the local copy store that does big work for the university.
sub
I have original coned D140F speakers and K and E 140s. I would not give my original cone D140Fs for anything. If you want to 70's sound use the 140-F/K/E the aluminum done does extend the high end. You will not get the same sound with the paper center dome. JohnQuote:
Originally Posted by marcuswilson
Interesting that the 2220 has a 101 sensativity rating - wow!
How long were these in production?