Ferrofluid Repair Kit

Ferrofluid 100uL General Purpose for 1" Diameter Coil

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Part Number: MI-FF100

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Ferrofluid Repair Kit, 100uL for 1" Diameter Voice Coil Part # MI-FF100

Ferrofluid Repair Kit
100uL for 1" voice coil
Reduces distortion
Increases power handling
Comes complete with cleaning strips and instructions
For most compression drivers, repairs, and diaphragm assemblies
SDS

Our ferrofluid kits come with pre-measured packets of ferrofluid which are used to replace the old fluid in speaker air gaps when replacing diaphragm and coil assemblies.

Ferrofluid improves the performance of high frequency and midrange drivers. It works by damping the impedance at resonance to effectively lower distortion, smooth frequency response, and increase thermal power handling. It should be used to replenish drivers treated previously with ferrofluid. With care, it can also upgrade most drivers that have never contained ferrofluid. The kits listed are approximate fill quantities relative to approximate voice coil diameters. In general, the air gap should be 75% filled prior to inserting a voice coil diaphragm assembly. The kit contains synthetic ester-based ferrofluids and in most cases should not pose any adhesive incompatibility. It is recommended that this is confirmed by contacting the driver manufacturer prior to usage. Adding ferrofluid to a driver not intended for it will, in most cases, void the original manufacturer's warranty. Included in kit: A ferrofluid packet, absorbent paper strips for removing old ferrofluid, detailed instructions, and material safety data sheet.

Specifications and Physical Properties

Appearance	black-brown or red-brown viscous fluid
Carrier Liquid	synthetic ester oil

	CGS Units	SI Units
Saturation Magnetization (Ms)	220 Gauss	22 mT
Viscosity @27°C	200 cP	200 mPa·s
Density @25°C	1.16 g/cc	1.16 10³ kg/m³
Pour Point	-35 °C	-35 °C
Flash Point	>200 °C	>200 °C
Thermal Conductivity @38°C	150 mW/(m·K)	150 mW/(m·K)
Surface Tension @25°C	32 dynes/cm	32 mN/m
Coefficient of Thermal Expansion	7.5 x 10^-4 ml/ml°C	7.5 x 10^-4 /K

Rating Snapshot

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Average Customer Ratings

4.9

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Tech

I had a speaker with low output from the tweeter and replacing the ferrofluid fixed the problem!

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Reviewed by: Rick Denny from Amarillo, Tx on 1/21/2016

mr.

In my JBL 4408A speakers, the tweeters were starting to sound bad --really bad! I pulled them apart and cleaned the gap in the magnets then added new ferrofluid from "Simply Speakers". The result was unbelievable. My tweeters have never sounded this good. I am normally too busy to leave reviews but I am so pleased that I took the time to do so.

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Reviewed by: Gary Moore from Tempe, Az on 11/4/2017

Quick service and great product

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Reviewed by: (Verified Buyer) Eric Takushi from Orange, Ca on 12/8/2017

I’m so glad I tried this on my 23 year old B&W P4 tweeters. I was ready to let them go since it would be too expensive to replace the tweeters. After installing new ferrofluid they are like new again. My advice is to definitely try this, but make sure you clean the old fluid out first. Mine was sticky like tar and took about 45 minutes per tweeter to clean, but well worth it.

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Reviewed by: Rob from Leesburg on 12/17/2017

This was a premeasured amount and has worked perfect since installing

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Reviewed by: Christopher Fugitt from Hope AR on 1/11/2018

Thanks!

I would like to thank Simply Speakers for offering this product. I acquired a pair of KEF C40 speakers. At this age (30+) the tweeters sounded lower in output and KEF no longer supports these drivers. I restored these speakers to their magnificent splendor with the use of this kit to remove and replace the Ferrofluid that had turned to sludge in the voice coil gap and stuck to the voice coil (used foam swabs to clean the voice coil), and re-coating the dome with Mod Podge waterbase fabric sealer. The speakers sound amazing thanks to this kit! A HUGE improvement and very inexpensive. Dull treble may not be your crossover capacitors if your tweeters employ Ferrofluid! This substance gets more viscus over time strangling your tweeters!

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Reviewed by: Jim from Schenectady NY on 3/2/2018

Director of engineering

The fluid works great. there should be more fluid for a 1" voice coil

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Reviewed by: Stephen from Trinidad on 1/2/2019

A+!!!

I have a vintage pair of BA A100's.... all original. I was skeptical about doing the fluid change, but followed the instructions, the old fluid absorbed right up, nothing gummed up in my case. Applied new fluid re-assembled and was amazed at the difference in clarity!! Glad I took the time to do it. First for me. Thanks Simply Speakers!!

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Reviewed by: Greg D from Ontario, Canada on 7/1/2019

Boston A400 Tweeters

While doing the new foam surrounds on my Boston Acoustics A400's I decided to replace the ferrofluid in the tweeters as well. Process was straightforward. Results were spectacular. I had forgotten how great the A400's coupled to my 80's Yamaha M65 amp and AVX preamp sounded. Very pleased with the results and my thanks to Simply Speakers for making these parts and the instruction on repair available to us old audiophiles with vintage stuff.

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Reviewed by: Rob from Missouri on 4/15/2020

Perfect For Tweeter Refresh

I purchased two of these ferrofluid refresh kits to restore the SEAS H211 tweeters in my PSB Project B2 speakers. The kit was easy to use, instructions were clear and easy to follow, and I'm very happy with the results.

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Reviewed by: Richard from Kitchener on 4/24/2020