SS Audio Diaphragm for Electro Voice 81256xx and 84234xx - Replacement

In this review of the SS Audio diaphragm for Electro Voice legacy drivers, the bottom line is clear: this is a direct replacement aimed at technicians and hobbyists repairing or restoring EV compression drivers. The reviewer found it swaps into many listed EV and Bosch factory part numbers cleanly and restores clear output from worn units. For anyone maintaining pro audio systems built around DH and ND series parts, the diaphragm provides a practical, cost-effective way to recover performance without replacing the entire driver.

Key Features

• Direct replacement compatibility: Replaces several New EV Factory and Bosch part numbers so users can match it to a wide range of older EV drivers without modification.
• Multiple model support: Fits DH1, DH5, DH6, DH7 and ND variants as well as many 8 ohm models, which simplifies stocking a single repair part for diverse drivers.
• Restores acoustic clarity: Designed to bring back the original high-frequency response that degrades when diaphragms age or fail.
• Economical repair option: Offers a lower-cost alternative to replacing complete compression drivers while maintaining compatibility with factory housings.
• Aftermarket sourcing: Supplied by Simply Speakers as a rebuild component for professional and DIY speaker repair projects.

Who It's For

This part is best for audio technicians, rental companies, live sound engineers, and experienced DIYers who need a reliable diaphragm to service Electro Voice compression drivers or Bosch OEM replacements. It is particularly useful when the original EV part number listed on older drivers corresponds to the 81256xx or 84234xx family and a direct swap is required.

It is not targeted at casual consumers who lack experience replacing diaphragms or those who prefer buying complete, modern replacement drivers; novices should seek a technician if they are uncomfortable with driver disassembly and reassembly.

Pros & Cons

Pros

• Wide compatibility across many EV and Bosch factory part numbers, reducing guesswork when matching replacements.
• Restores high-frequency performance without needing a full driver replacement, saving cost.
• Offered as a single, serviceable component suitable for field repairs and refurbishments.

Cons

• Requires speaker disassembly and some technical skill to install, so not ideal for beginners.
• Limited public documentation on material specifics; buyers must rely on fit and function rather than detailed spec sheets.

Specifications

Product type	Replacement diaphragm for EV compression drivers
Compatible part numbers	F.01U.281.502, F01U110542, 81256xx, 84234xx, 89796xx
Supported driver models	DH1, DH5, DH6, DH7, ND7, N/DYM 1 and variants
Impedance	8 ohms (models listed)
Brand	Simply Speakers (SS Audio)
Application	Speaker repair and diaphragm replacement

Our Verdict

The SS Audio diaphragm is a sensible choice for professionals and experienced hobbyists who need a faithful replacement for a range of Electro Voice and Bosch diaphragm part numbers. It brings back usable high-frequency performance at a fraction of the cost of a full driver swap and is a pragmatic way to extend the service life of legacy pro audio drivers.

Frequently Asked Questions

Will this diaphragm fit my Electro Voice DH1 or DH1012?
Yes; the part is listed as compatible with DH1 family models including DH1012 and related DH variants that reference the 81256xx family.

Is this diaphragm the same as the Bosch OEM replacement?
It replaces New EV Factory / Bosch listed numbers such as F.01U.281.502, intended to match the factory fit and function.

Do I need special tools to install it?
Basic driver disassembly tools and careful handling are required; if you are not comfortable with compression driver service, professional installation is recommended.