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Ultimate SDC Mod II (for your mic) - Hear it vs. KM 184
The Ultimate 603 Mod seems to have much nicer top end, I don ..
5 of 5 Stars!
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Ultimate SDC Mod II (for your mic) - Hear it vs. KM 184 $349.00 $199.00

A better-sounding and more affordable alternative to the KM 184
Have us upgrade your MXL 603, MXL 991, MXL 840, MXL 441, MXL 551, MXL V67n, Monoprice SDC, Avantone CK1, GA FC4, CAD GXL-1200, Nady CM-90, Apex 180 etc.

Listen for yourself below. There's only one way to get those results - the Michael Joly Engineering "Ultimate SDC Mod II" for your SDC.


MJE Ultimate SDC Mod II with DirectSound capsule housing mod (modified MXL 991 shown)

Listen and judge for yourself -


Listen to the KM 184 and MJE "Ultimate SDC Mod II" - You'll hear no edginess and more sparkle with the MJE Ultimate SDC Mod II. Most folks say they prefer the Michael Joly Engineering sound, do you?

SOUND FILE: Neumann KM 184, acoustic guitar, strummed
SOUND FILE: MJE Ultimate SDC Mod II, acoustic guitar, strummed

Inspired by the legendary KM 84 -

The Ultimate SDC Mod II (for your SDC mic) features two capsule innovations - the signature MJE "DirectSound" modification removes diaphragm setback coloration and a new backplate design eliminates the peaked and harsh top end found in all of these mics: MXL 603, MXL 991, MXL 840, MXL 551, MXL V67n, Monoprice SDC, Avantone CK1, Golden Age Project FC4, CAD M39, CAD GXL-1200, Nady CM-90 and Apex 180 etc.


No edginess / more sparkle!

Q: What’s the most common complaint leveled against the KM 184? A: “It’s too bright and edgy!” The MJE Ultimate SDC Mod II delivers a smooth and sparkly sound without the edgy HF peak found in the KM 184. The Ultimate SDC Mod II imparts 3 dB of “sparkle” in the very top octave from 8kHz to 16kHz relative to the KM 184. No edginess / more sparkle in other words.



Ultimate SDC Mod II (black) vs. KM 184 (Red)
NOTE: Graph is spectral response of strummed acoustic guitar. Response between 4kHz and 20kHz only is shown for clarity. The Ultimate SDC Mod II and the KM 184 are +/-0.5 dB of each other between 40 Hz and 4 kHz.

Premium Electronics Upgrade -

The next step toward world-class SDC sound is provided by my field-proven Premium Electronics upgrade package. These component upgrades and topology changes extend bass, reduce midrange graininess and make the top end smoother. Your Ultimate SDC Mod II mic will deliver smooth and sweet sound in your critical acoustic guitar and drum OH recordings.


Complete Rebuild -

To deliver these benefits your SDC will be completely disassembled and rebuilt. The PC is board removed and upgraded with superior components. All capsule parts (screen, diaphragm, spacers, backplate, tuning chamber and retaining ring) will removed from their housing and safely stored.

The capsule housing is re-machined with the MJE “DirectSound” mod to eliminate diaphragm set back resonance and coloration. A new diaphragm, hand-selected for flattest HF response is installed (if you send us two mics we'll select and install a matched pair of diaphragms). The new advanced-design MJE backplate is used to build up the modified capsule. Once re-assembled, the entire capsule is tuned to an ideal capacitance for greatest sensitivity and output.



Neumann KM-184 (top), MJE Ultimate SDC Mod II (bottom) at the shootout


Ordering is Easy -

Click "Add to Cart" to purchase the Michael Joly Engineering "Ultimate SDC Mod II" for your MXL 603, MXL 991, MXL 441, MXL 551, MXL 840, Cascade M39, CAD GXL-1200, Nady CM-90, Avantone CK-1, Apex 180 or similar mics. You'll get an immediate acknowledgment. By the close of the next business day you'll receive a personal email with your scheduled modification and ship dates. Questions? Just click "Contact Me" - best, Michael


Hear the new MJE-384K capsule upgrade for the RODE NT5 vs the Schoeps CMC6 and Neumann KM 184

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