Help With Potential DIY Project

[4313B]

What do you guys think? Should I go for a pair or 2245H with total cost of $405 or should I go for a two pairs of 2235H for $1000. Those who have experienced both - is $600 worth the difference?

I never really thought about it in monetary terms but I guess I would have to say no, it isn't worth a $600 difference. I can't imagine you not being satisfied with the 2245H's.

But then again, dual woofers are a very big selling point in certain parts of the world...

Reconed 2245H sell on e-bay for $275 all day <- these are not factory recones but "just as good" - I understand the with the 2235H aftermarket recone kits miss a ring or some sorts (that helps weigh down the cone). Is there such a concern with the 2245 after market kits?

I personally don't do aftermarket kits in JBL cores so this information is meaningless to me. To me it is completely pointless to put non-JBL software into JBL hardware. Buy a Radio Shack driver instead, they're cheaper to eff around with.

[Earl K]

Reconed 2245H sell on e-bay for $275 all day <- these are not factory recones but "just as good" - I understand the with the 2235H aftermarket recone kits miss a ring or some sorts (that helps weigh down the cone).

Is there such a concern with the 2245 after market kits?

- Aftermarket kits are virtually certain to not give the correct Ts parameters, notably ; BL, Mms, Re, etc. .

BL = a measure of the motor strength
Mms = a measure of the mass ( weight ) being moved by the motor
Re = is important because the first two are ( eventually ) referenced against its' value .

- These Ts values represent the "recipe" that makes a JBL transducer a "JBL" / or an Altec for that matter ( which uses a quite different recipe of values ) .

- Also ( FWIW ), once you've flagged yourself as a user of aftermarket products / you've guaranteed that the resale value of your castoffs will be heavily discounted if not outright dismissed as being worthless by those in the know ( & expanding this knowledge "of those in the know " into the larger DIY user base is one of this websites missions / at least, in my world ) .

- ie; Don't go there !
>< cheers

[dkalsi]

- ie; Don't go there !
>< cheers

Earl K and 4313B,

Duly noted - no aftermarket kits for me - trust me - I would hate to go through the hassel pursuing a DIY project only to find out the certain components will not be performing to spec - that alone will drive me crazy.

Thanks

[dkalsi]

For one thing, I know it is going to be nearly impossible to find a 2-pairs of 2235Hs, hence could someone quickly list for me all the drivers that can be reconed to be extactly 2235H?

From what I have found so far, i know the 2225 can be reconed to the 2235H, any others?

This way I could lookout for blown woofers (collect 4) and recone all four to be 2235.

Thanks in advance

(in the mean time I will keep a lookout for another 2245H)

[dkalsi]

For one thing, I know it is going to be nearly impossible to find a 2-pairs of 2235Hs, hence could someone quickly list for me all the drivers that can be reconed to be extactly 2235H?

From what I have found so far, i know the 2225 can be reconed to the 2235H, any others?

This way I could lookout for blown woofers (collect 4) and recone all four to be 2235.

Thanks in advance

(in the mean time I will keep a lookout for another 2245H)

Nevermind on the question about which baskets I can use for the 2235H, based on my search, the following can be used:

D130
K130
K140
136
2135
2205
2225
2231
2235

(someone correct me if I am wrong)

[dkalsi]

Anyone here has experience with the TAD Tm-1201 ?

(I will obviously keep a look out for 2122H)

If I was to purchase 2123 and have them reconed to 2122H - it would cost about $500.

The TAD TM-1201 woofer can be had for about $450-$550 all day on the used market.

Given the specs below - any opinion whether or not I should consider it:
TM-1201 / TM-1201H SPECIFICATIONS Voice coil impedance: (TM-1201 - 8 ohms)/(TM-1201H - 16 ohms). Lowest resonance frequency (fo): 52Hz. Recommended frequency range: 200 - 3,000Hz. Rated input power: 150 watts. Maximum input power: 300 watts. Sound pressure level: 100dB/W (1m). Equivalent mass (infinite baffle): 2.1 oz/60g. Qo: 0.16(fo = 52Hz). Total magnetic flux: 324,000 maxwells. Magnetic flux density: 14,500 gauss. Baffle opening: 10-7/8 inches/276mm. Mounting dimensions: 11-9/16 inches/293mm (6 holes). Weight: 24 lbs. 4 oz./11kg. Outer dimensions (diameter x depth): 12-1/2 x 4-5/16 inches/318 x 110mm.

[Mr. Widget]

If I was to purchase 2123 and have them reconed to 2122H - it would cost about $500.

The TAD TM-1201 woofer can be had for about $450-$550 all day on the used market.

If you can have freshly reconed 2122Hs for the same price as a pair of used TAD PA speakers, why would you even consider the TADs?

Then again, what is your design? Do you even need a midbass driver?


Widget

[dkalsi]

If you can have freshly reconed 2122Hs for the same price as a pair of used TAD PA speakers, why would you even consider the TADs?

Then again, what is your design? Do you even need a midbass driver?


Widget

Widget - I agree - its just 2122H is hard to find. I need to find baskets. I would personally hate to buy a nice pair of 2123H and have them reconed - hence, the reason why I am searching for baskets.


In terms of design, i believe I have the following set in stone:

Tweeters - JBL 2405
Mid-High - JBL 2441 + JBL 2397
Mid-Bass - JBL 2122H (if I can find a pair).
Bass - still searching

Need help deciding what to do for bass region - wheter to go with single 15" 2235H, dual 2235H, single 2245H, or One - 2235H + One 2245H.

[4313B]

Widget - I agree - its just 2122H is hard to find. I need to find baskets. I would personally hate to buy a nice pair of 2123H and have them reconed - hence, the reason why I am searching for baskets.

Use 2123H's if you have to. They are ~ 3 dB more efficient and don't have nearly the bottom end that the 2122H's have but you only need to get them down to ~ 300 Hz anyway.

[hjames]

really, I have 4 ways and 3 ways with similar drivers...

You should come listen before you set anything in stone ...

our biamped 4341s have

2235
2122
2425/2307
2405
(plus a B380-2235 sub for movies/TV)

our "custom" L200/3-ways have

2234
2420/2397
2405

Its actually surprising how good the 3 ways sound ...

And if you are home brewing a system, and custom crossovers,
the less drivers, the easier it is to get them to play well together.

Widget - I agree - its just 2122H is hard to find. I need to find baskets. I would personally hate to buy a nice pair of 2123H and have them reconed - hence, the reason why I am searching for baskets.


In terms of design, i believe I have the following set in stone:

Tweeters - JBL 2405
Mid-High - JBL 2441 + JBL 2397
Mid-Bass - JBL 2122H (if I can find a pair).
Bass - still searching

Need help deciding what to do for bass region - wheter to go with single 15" 2235H, dual 2235H, single 2245H, or One - 2235H + One 2245H.

[dkalsi]

Heather -you have a PM.

Thanks
D

[dkalsi]

Quick question,

A buddy of mine in New Jersery is willing to sell me a pair of 2241H for $550 (I will need to get more details regarding whether or not they are all original).

But before I inquire any further - wanted to find out if the JBL 2241H could be used in this application (i.e. JBL 4345 type configurations)

[4313B]

2245 (red) versus 2241 (yellow) in 4345 box:

[dkalsi]

Update:

I received my MINT (at least cosmetically) JBL 2405 in the mail today.

I have a blown JBL 2245H on the way from e-bay.


I was able to find plans for the JBL 4345 on line. I am thinking about going forward with that design.

I was thinking maybe I can replace 2421B+2307 combo with 2441 driver+Selenium HL14-50 2" Exponential Horn

What I also plan to do is build a thin profile seperate cabinet above the 4345 clone and include in it the 2441+2397 combo (given the fact that I currently have 2 pairs of 2441 on hand).


I can certainly modify the cabinet of the 4345 clone to include the 2397 as oppose to the Selenium HL14-50 horn - but I don't think it will look nearly as good.

More thoughts + opinions?

Thanks
D

[hjames]

I'd build the 4345 as a complete clone, and just put a blank plate over the hole where the 2307 horn would go. Can't hurt, and if you ever sell, or want to try the original design, the hole is already there. Won't take any appreciable work if you do it in the initial build.

Put the duck lips on top - with a pair of front to back 1x3s on a baseplate
and just rest that arrangement on top of the main box.
ala Jerry_rig's speakers here - http://audioheritage.org/vbulletin/s...ad.php?t=24596

Update:

I was able to find plans for the JBL 4345 on line. I am thinking about going forward with that design.

I was thinking maybe I can replace 2421B+2307 combo with 2441 driver+Selenium HL14-50 2" Exponential Horn

What I also plan to do is build a thin profile seperate cabinet above the 4345 clone and include in it the 2441+2397 combo (given the fact that I currently have 2 pairs of 2441 on hand).


I can certainly modify the cabinet of the 4345 clone to include the 2397 as oppose to the Selenium HL14-50 horn - but I don't think it will look nearly as good.

More thoughts + opinions?

Thanks
D