I'm looking at the AKG 240, Sennheiser 280, and koss pro4aa headphones. Most of the studio people that I know have experience with the AKG and like them, but say that they are quiet and should have a headphone amp pushing them. They were saying that it has a high impedance (I think). From what the specs say, it's 55 ohms. The Sennheiser is 64 ohms and the koss is 250 ohms.

Can someone clarify what 'nominal impedance' is when given in mic specifications. I believe that with loudspeakers the nominal impedance is the lowest impedance above the resonant frequency of the speaker itself. Is this true of mics also or am I shooting in the wrong direction...

I have a Tascam portastudio 788 what impedance should the headphones that i'm going to get be?

Can anyone tell me what the difference between a (DI) Direct instrument input and a Line level input is and what type of instruments each of them are. Also what are the impedance differences between the two.

Thanks
Niros

Hello

Hi Seb, could I get you to weigh in on the discussion starting with this post? The question in volves using a Royer SF-12 with a VMP. Thanks in advance.

I had a most disturbing revelation today. My guitar tone sounded kind of wooly and lacked the dynamics that it used to, so I thought to myself "new strings"? But.. just to be safe, I tried unplugging from my pedalboard and straight into the amp. Lo and behold, the sound was brighter, LOUDER, and had a much greater dynamic range. I'm trying to figure out why this is...

Hey everyone, I have a question:

From my understanding, you should set a preamp's input impedance to 10 times the amount of a mics output impedance. Is this correct? And, if I decide to try a different input impedance on the pre, could it cause damage to the mic or preamp?

Thanks in advance for the help!
-eric.

i have a new-to-me allen and heath sys 8 with xlr(only) bus outs, and a fostex 80 reel-to-reel, rca in/outs.
i am looking for a xlr-rca snake to hook up, but i was just told by a salesman i'd *probably* need transformers on every channel, due to impedance issues.
please advise!

When do I need to be concerned about impedance mis-matching when dealing with XLR <-> 1/4 connectors on the same cable?

For example, do impedeance mis-matches only occur with XLR(bal.) <-> TS(unbal.) ends as opposed to XLR(bal.) <-> TRS(bal.) ends?

Please clarify and reinforce this concept for me for me, it would be MUCH appreciated.