Very simple - mic into the preamp, line out to your H4N.
Also - before you drop money on a pre-amp, try powering your mic with a battery instead of the H4N phantom power and make sure you've upped the input gain on your H4N. Sometimes it's the little things...
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This is how I learnt to connect a MixPre with an H4n.
(It works, and gives really nice quality audio)
I actually did something like this, picture link below. I followed Dan McComb's rig using the MM1 instead of the SD mix pre because it is true the H4n has terrible mic pre's. I chose a switchable pad attenuator with 20, 30, 40db of attenuation because I wanted options. The result is a big step up towards broadcast quality. Only downfall is having to figure out how to carry this rig and still have access to all the needed functions.
Unfortunately, the H4n has no line input. So to properly get signal from line level in, you do have to attenuate the signal by about 30dB. The problem is, then youll be using the H4n's preamps to bring that signal back up. There is no high quality way to do this. I believe the H2 has line input from an 1/8" trs. The Sony d50 also has a line input that would accept a tape out from your MixPre. Though the d50 is $450-$500.
I also recommend against using this combo of equipment ( zoom H4n + ntg2 + MM1 ) the results sound bad and yes I have tried this exact setup. the fault is the mic/line input on the zoom but the NTG-2 is also junk. My advice is don't waste your money on an external mic pre to try and improve this setup. Keep the zoom for convenience and portablilty then just save up for better quality shotgun/pre/recorder. Ditch the NTG-2
I have an NTG2 and an H4N. I have never had problems with it being overly quiet. I have noticed a new battery in the NTG2 tends to give it some life. What are you recording specifically? If you're trying to do quiet foley then yeah the whole rig is going to have it's limitations due the preamps and microphone.
I have a question
I am a professional sound supplier and i just bought the H4N and i want to use it more than just a recorder as the in built mics works great. I want to take the output from the H4N(via the jack out) and put it in the mixer and then to my speakers and everywhere. I tried connecting it to the mixer but as i increase the feeder the sound quality got real bad(But the headphones sounds great) HElp please