free shipping at parts express

Radian 1225-8 Diaphragm Fits Most JBL 1" 8 Ohm

Brand:|Model: 41423|Part # 294-720
Radian manufactures replacement diaphragms that fit popular compression drivers found in home and professional loudspeaker systems.
In Stock
List Price$120.00
You Save33%
Your Price
Part # 294-720
  • Fits popular compression drivers used in home and professional loudspeaker systems
  • Aluminum alloy dome/Mylar®surround construction
  • High efficiency, accurate reproduction, and extended bandwidth
  • Equivalent or better performance than the original
  • Made in the USA

Product Details

Radian 1225-8 Diaphragm Fits Most JBL 1" 8 Ohm

Radian manufactures replacement diaphragms that fit popular compression drivers found in home and professional loudspeaker systems. Each diaphragm employs aluminum alloy dome/Mylar®surround construction to provide high efficiency, accurate reproduction, and extended bandwidth. Radian's use of sophisticated materials and processes results in diaphragms that have equivalent or better performance than the original. Made in the USA. Fits 8 ohm JBL LE85/LE175, 2420, 2421, 2425, 2426, 2427, 2470.

Radian manufactures premium replacement diaphragms that fit popular compression drivers used in professional loudspeaker systems. Each aluminum alloy replacement diaphragm provides high efficiency and accurate reproduction with extended bandwidth. Replacement diaphragms are designed and manufactured to have equivalent or better performance than the original.

Compression domes are precision formed from heat-treated, structural aluminum alloy and bonded to a copper-clad aluminum voice coil with a Kapton® former utilizing proprietary tooling. Aluminum has a higher strength-to-weight ratio than titanium providing low-distortion, high-fidelity response that delivers clear, crisp music and speech for theatrical, auditorium, stadium and church installations.

The suspension is made of specially developed Mylar®. Utilizing a Mylar® surround enhances the replacement diaphragm’s reliability and eliminates fatigue stresses that destroy other compression driver diaphragms. The Mylar® surround also provides good dampening of the voice coil/diaphragm assembly for smooth, low-distortion, linear output with excellent transient response. To ensure longer diaphragm life, our high temperature voice coil former and advanced adhesives permit each replacement diaphragm to sustain high RMS and peak power levels, equivalent or better than the original.

The diaphragm/voice coil assembly may be rapidly readily replaced in the field. The self-aligning diaphragm assembly assures simple installation and accurate alignment with same polarity as the original.

Unparalleled power handling, high-frequency performance, reliability and low-distortion make Radian premium replacement diaphragms the preferred choice for loudspeaker repair centers, consultants, sound system designers, contractors and engineers worldwide.

Product Specifications
  • TypeDriver Diaphragms
Radian 1225-8 Diaphragm Fits Most JBL 1" 8 Ohm
  • BrandRadian Audio
  • Model41423
  • Part Number294-720
  • UPC844632053429
  • Product CategoryReplacement Diaphragms & Baskets
  • Unit of MeasureEA
  • Product Rating
    (1 Reviews)
  • Weight0.17 lbs.
  • California Prop 65

    Warning: California residents only. Please note per Proposition 65 that this product may contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm.

View similar products to the Radian 1225-8 Diaphragm Fits Most JBL 1" 8 Ohm
in the Replacement Diaphragms & Baskets product category.


Radian 1225-8 Diaphragm Fits Most JBL 1" 8 Ohm
Radian 1225-8 Diaphragm Fits Most JBL 1" 8 Ohm is rated 5.0 out of 5 by 1.
Rated 5 out of 5 by from Great Upgrade for Ti 2425/2426 JBL 4430/35sIf you have speakers that use JBL 2425 or 2426 horn drivers, you probably know that the diaphragms are titanium, and that the earlier 2421 Alnico drivers had aluminum diaphragms. The AL diaphragms are sought-after, and widely considered to sound smoother, with less distortion, than the Tis. But unfortunately, their surrounds are also AL and over time they fatigue and can fracture. They also handle less power, which is why JBL switched to Ti, following a very embarrassing public fiasco where a bunch of their PS systems failed at the Academy Awards (R), or so I have read.This situation would leave one with a choice of smoother, but weaker and more expensive (AL), or harsher, but more robust (Ti). Miraculously, though, Radian has stepped in with an AL diaphragm that has a robust Mylar (R) surround, combinging the best of both worlds. I just installed them in my JBL 4430s, with 2425 drivers, and the installation was a basic drop in. (word of warning: Control all ferrous metal fasteners and wires to prevent damage to the diaphragm from magnetic attraction, and replace the gooey foam in the back cap with felt. Also pay careful attention to the order in which the fasteners and terminals are stacked in terms of rubber and metal parts, and maintain the OEM polarity, with green or red indicating positive on the diaphragm).The DC resistance of the diaphragms is about 3.1 ohms (stock Tis was 4.1) but based on what I;m hearing and the graphs published by Radian, the output seems to be very equivalent. As compared to the Tis, though sound seems smoother and less compressed at high output levels; it really opens up these speakers and smooths them out. And if you call up Radian, as I did, you may be able to speak directly to the engineer who builds these things; he gave me tons of interesting details regarding their construction, and I gather that their team includes ex-JBL and Altec engingeers who continue to build drivers in Orange County, CA, and Radian claims that it it the only remaining US-based driver manufacturer in the world (!).In sum, I say, there are a remarkable value.
Date published: 2014-07-00
  • 2016-02-13T06:40CST
  • bvseo_cps, prod_bvrr, vn_cps_3.1.6
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_1
  • loc_en_US, sid_294-720, PRD, sort_mostRecent
  • clientName_PartsExpressInternational

Product Q&A

Get your questions answered from other customers
who own this product or have experience with it.
If your question requires design or troubleshooting information,
please email  for a prompt reply.
Radian 1225-8 Diaphragm Fits Most JBL 1" 8 Ohm

Does this 294-720 fit the 2146H-1? The voice coil measures 3.3 ohms.

Asked by: Bimmerb5
This diaphragm will not fit that driver.
Answered by: MattP
Date published: 2015-12-28

Will this diaphragm fit a jbl 2415 ? Thanks..

Asked by: chasboroso
Unfortunately this will not with the 2415 drivers.
Answered by: MattP
Date published: 2014-03-10

Do you stock the "Back Cap" required for this diaphragm to be used w JBL 2416 drivers? Thanks

Asked by: gcarlberg
Unfortunately we do not have this item available.
Answered by: MattP
Date published: 2013-08-15

Does this fit the JBL 2402 baby cheek?

Asked by: SnowDog
No, this does not fit the JBL 2402. This diaphragm is for compression horn drivers. The 2402 is a 1 3/4" ribbon in a bullet horn.
Answered by: RAK Audio
Date published: 2012-01-27
  • 2016-02-13T07:31CST
  • bvseo_cps, prod_bvqa, vn_cps_3.1.6
  • cp_1, bvpage1
  • co_hasquestionsanswers, tq_4
  • loc_en_US, sid_294-720, PRD, sort_recentQuestionsFirst
  • clientName_PartsExpressInternational

Recently Viewed Products

Parts Express FacebookParts Express TwitterParts Express YouTubeParts Express PinterestParts Express SpotifyParts Express Instagram
Live Chat Software