We modify Sennheiser 416T and 816T mics

to work on 48 Volt phantom power,

eliminating the need for T-power barrel adaptors,

or T-power battery boxes.



email phantompowerupgrade@gmail.com

to request an order form.

Send your mic and the form to our shipping address using your preferred shipper.  Normal turn-around time for the upgrade is approx 2-3 days.


After the upgrade, your 416T:

1. Is tested with 48 volt phantom power, then “burned in” for 24 hours and tested again.
2. Is affixed an ID tag near the Sennheiser logo indicating 48V Phantom Power.
3. An “after” reference file is recorded, and checked against the “before” file for identical response and output level.

  1. 4.You are emailed an invoice for $125 plus return shipping. Credit cards via Paypal or  mailed checks are accepted.

  2. 5.When payment is received, the unit is packed, and shipped back to you. Our preferred shipping method is USPS signature required, priority mail. Fedex upon request, we can use your account number if desired.

1. What are you doing to the 416T to allow 48volt phantom power operation?

Sennheiser created multiple circuit variations in their T-powered microphones. The microphone is disassembled, and the upgrade

process is dependent on the circuit/component placement that Sennheiser used at the time the mic was constructed. At last count, there are at least 4 circuit variations on the 416T to date (not including 415 designs). We have often found 416T circuit boards inside 415 microphone shells, and visa-versa!

After initial testing, 24 hour burn-in period, and re-testing, reference files are recorded and maintained exhibiting before/after performance.

The upgraded mic has an annealed aluminum PH48 label affixed to the shell.

  1. 2.Will the upgrade change the sound of the microphone?

No, the microphone will sound exactly the same as before the upgrade. Test recordings of “before” and “after” the upgrade are compared and maintained for every microphone.

  1. 3.Do you repair broken microphones?

If your mic is currently non-functional, intermittent, noisy, or has response anomalies, we recommend you use Sennheiser factory service prior to upgrading your unit to 48 volt phantom. There are also service options available through the various location sound equipment dealers. In order to minimize our upgrade turn-around, and to facilitate support of our upgrades, we don’t wish to position ourselves as a general repair service for Sennheiser microphones.

3. Do you offer a warranty?

We offer warranty service for issues specific to our modifications for a period of 1 year. If your mic develops problems of any kind, we test for any malfunction of our modification, and repair as necessary. If the problem is with the original Sennheiser circuit, we first check for basic repairable issues, such as broken solder joints and repair as required.  If the unit requires factory repair, (such as capsule or crystal replacement), we first reverse the mic to the original unmodified, T-power configuration. We then forward the mic to Sennheiser for repairs, and advise you of Sennheiser repair charges.  Upon return, we re-install the 48 volt upgrade as part of our warranty.  Check with Sennheiser’s factory repair website for their current repair process on 416 or similar microphones.  Update: as of late 2015, Sennheiser has stopped offering repair service on 816T, 815T and 415T microphones for “end of service life” reasons.

  1. 4.I have other microphones that are T-powered. Will you upgrade them?

We also upgrade most Sennheiser 415, 435, 815 and 816T microphones. Please inquire about 406T mics.  Very early 415 and 815 mics may not be upgradeable,  Of course, we upgrade Schoeps CMC4 amplifier bodies for 48V Phantom power, information available at www.CMC4upgrade.com

  1. 5.Will you upgrade Tuchel connector mics?

We currently do not offer conversion of your Tuchel -ended mic.

  1. 6.What’s wrong with T-power barrels and power supplies?

Left unknowingly in-line, T-power supplies can cause electronic damage to other microphones. They may magnetize microphone parts and transformer cores, possibly causing distortion.  Plugging dynamic, ribbon or phantom powered microphones into a T-powered outlet is an invitation to disaster. The 416’s RF blocking inductors can be damaged from excessive T-power current.  For location sound mixers, T-power adaptors are cumbersome. They are easily misplaced. They add unnecessary XLR and barrel length to the mixer’s input connector, or to the microphone itself.  Adaptor barrels create dangerous leverage. A cable yanked from a barrel can cause damage at the mixer input panel.

7. How did T-power originate?

Before the advent of DC-DC converters, the 12 volts of T-power was much easier to generate from Nagras and other portable battery-powered equipment  than the 48 volts required by early phantom systems. This explains its previous ubiquity in film work. 

8. Where are you located?

Dallas, Texas USA. Your CMC4’s are sent to a secure, full-time mail facility who will sign for your shipment.

Frequently Asked Questions:

Prior to the upgrade, your 416T:

  1. 1.Is tested for proper operation with 12 volt T-power.

  2. 2.A “before” listen test, and wav recording is made, indicating sensitivity, noise floor, and freq. response. Recordings are maintained for future reference.   Any issues  outside of normal condition and operation are noted. If necessary, the owner is contacted with regard to any issues that require resolution prior to the upgrade.

To upgrade your 416T, email phantompowerupgrade@gmail.com

and request an order form. Then ship your unit & form to the provided address. Turn-around time is 5-10 days from receipt of your microphone.

(If a backlog exists, we’ll let you know before sending your unit.)

Copyright 2016  Peter Verrando LLC

Dallas, TX USA

Upgrades are performed by Pete Verrando of CMC4upgrade.com, originator of the 48V conversion for Schoeps CMC4 T-powered microphones.

Upgrade cost: US $125 + shipping.

Payable with credit card via Paypal upon completion of upgrade prior to return shipping.