Here are some kind and unbiased reviews:
Michel Farabee from Resto-Mod-Mics
http://www.soundonsound.com/reviews/martiaudio-line-preamp-booster
http://www.mykescaffidi.com/?p=307
thank you very much indeed for consistent customer feedbacks.
Made with Unbranded XLR this is a In-Line Mic BOOSTER BARREL XLR, CLEAN FOR RIBBON - DYNAMIC - TUBE - Battery Powered condenser MICROPHONES
It is powered by your preamp's phantom power 48V.
similar to products like Triton FetHead or Cloudlifter or passive transformer Crimson Mogaine.
Having sold so many I can guarranty consistancy and reliability without audio quality compromise and very affordable.
IT WILL NOT WORK ON CONDENSER MICROPHONE needing phantom power 48v ITSELF!
It reverses the phase of your mic plugged in.
Note that all Microphone manufacturers have their own phase signature which isn't always the same but remember that this booster reverses the phase of whatever mic plugged in. ( for electronic solidity integrity and signal path I do not wish to reverse the phase within the unit )
THIS GREAT VALUE FOR MONEY BUT I DO NOT RECOMMEND THIS FOR PROFESSIONAL USE!
THIS IS AN AMATEUR CONNECTION WITH UNBRANDED BLACK XLR CONNECTOR TO PROVIDE LOW COST PRODUCT THERE IS THE PRO VERSION LISTED ALSO WHICH IS MADE WITH NEUTRIK LIFE TIME CONNECTOR QUALITY. DO CONSIDER THE EXTRA COST FOR A SERIOUS USAGE.
In a studio it is great on ribbon mics, it seems that I sold a lot for SM7b..dynamics also.
Note that if you have World class preamps like 1073 clones, API, quadeight..you want to drive these well instead of using it at unity with a booster between. Still it is superb on ribbon where you need a lot of gain keeping low Signal/noise ratio that way.
Similarly LIVE it can be great in situations where you want less mics on stage and more attention to placement. it gives a great alternative to condenser especially if you have only a m57/58 handy that day!
This is Hand made by myself with hand picked High quality components.
Good practice is to plug the booster to microphone with short cable & longer cable to preamp to avoid strain and mechanical stress to this barrel witch will guaranty long life and good practice.
It is THE cheapest product yet ULTRA CLEAN and straight forward!. Produces 19 to 25db ( depending on Microphone Impedance, Preamp input impedance and load relationship..)
It will accept low impedance vintage ribbon mic like 30 ohms.
here are some links on the subject:
http://www.recordingmag.com/resources/resourceDetail/266.html
I own a Neve 517 and if you read page 4-5-6 of this Rupert Neve manual, it also provides invaluable information on Microphone - Preamplifier impedance relationship.
The microphone input is free from phantom power leak with this product and will guarranty safety.
If you need more than one booster it will be pair or quad matched free of charge.
To Date, I've made probably well OVER 1000 units distributed in UK, France, Spain, Holland and mainly USA/Canada. it is Always difficult to get feedback.. so if you buy one or more and you are satisfied, please leave some feedbacks on ebay but more improtantly on Martiaudio on Facebook see link below
Many thanks.
That could take up to 3 weeks if not immediately available. But even If I am away, I generally honnor the delivery within 8 days.
Most Field recorder Battery and Wallwart Powered with 48V phantom power selection..like Zoom H4n, ( NOT H2n!)
most good preamps with 48Vdc phantom power, but I can't guaranty it if the voltage is lower that 48v.
Tested and used on the following:
recently Rode NTG4+
Various restored 30's to 60's Ribbon Mics
C12 clone tube
C24 clone tube
Rode M1
1x Heil PR22
EV nd68
3x Vintage Shure Unidyne iii SM57
1x Vintage Shure Unidyne 515SA
1x Vintage AKG D12
1x Vintage AKG D190
Beyerdynamic M88
EV767 and EV468
stc 4033a, stc 4021, b&o bm6
2x Vintage Sennheiser MD421 preferably rool off bypassed on "M" but works on all setting with "S"
1x Apex Ribbon Mic common enclosure Highly Modified with new ribbon, wiring, cinemag transformer, Cascade ribbon mics,
3x VERY VERY VERY RARE cardioid Tannoy Ribbon barrel mic, refurbished all original, new ribbon, new wiring
1x Bang & Olufsen Very Rare BM3 Ribbon Barrel Mic refurbished
Also very good on new range of transformeless dymanic microphone like sennheiser e606*
And many others from well over 500 buyers by now.
see feedbacks...
Caution: According to one customer Boardcast sennheiser ME-66 with its power supply K-6 don't work with my booster and H4n..
The High Quality and characteristic of this booster is due to High quality components, simplicity and straight forward signal path.
IT WILL WORKS ON ANY MIC PASSIVE OR SELF POWERED AS LONG AS IT IS BALANCED AND ANY MICPRE WITH 48V PHANTOM POWER
I will accept PAYPAL from PAYPAL VERIFIED, ONLINE BANKING ( UK ONLY ) very welcome or Cash at collection.
I ACCEPT EXCEPTIONAL RETURN DUE TO FAULT ONLY. THE ITEM NEEDS TO BUT AS NEW AND RETURN IMMEDIATELY OTHERWISE I WILL REFUSE ANY REFUND ( IT SEEMS THAT SOME BUYERS USE THE DEVICE FOR PROJECTS AND ASK TO RETURN IT FOR REFUND.. THAT IS NOT ACCEPTABLE .)
SHIPPING: Buyer pay for shipping ( the item is tracked with reference ).
CONSIDERATE COMMUNICATION IS USUALLY THE KEY TO A GOOD TRANSACTION.
You can contact here if you need to know anything or for a special order: martiandmarti@gmail.com. thank you for your time and understanding.
Have a good look at my other stuff!! Good luck and thank you for looking