Tyll Hertsens

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FWIW, I cast my vote for low output impedances. Just seems to make more sense to me.

Happy birthday, boss.

Solid state amps can have current limiting (short circuit protection) and feedback resistors that raise the output impedance to 2-8 ohms fairly regularly ... I think. The 120 Ohm European number exists, but it's for a bullshit reason: Back before "real" headphone amps, receivers used to provide a headphone jack by taking the power amp output and putting it through a resistor to the headphone jack. For that and other reasons, headphone makers HAD to assume they weren't going to get any damping from the amplifier and had to do it for themselves acoustically. DOn't know the exact reason, but 120 Ohms was the number choosen for the "average headphone jack" output impedance. Dinny, you can measure output impedance by: 1) Set an output reference voltage without any load. (Say, 1 Vrms) 2) Put a resistor as a load. 3)Read new voltage. 4)Calculate output impedance. For example, if you put on a 1 ohm resistor and the voltage drops in half, then the output impedance is also 1 ohm.

Happy B-day, mate!

See!? You can get Beats Studios in all the colors of the rainbow!!! They're so far ahead of the curve.

The California Headphones are brought to you by the same folks that produce the Fanny Wang brand. I've got both the Siverado and Loredo. Measurements will go up in next months update, but they're no big deal. Not bad, but not good either ... prolly not worth any lusty thoughts.

Hey, I like purplr too. Actually, I think it's the headband that strikes me as feminine with these cans. And for the record I think men and women has various proportions of masuline and feminine characteristics.

Hm. How to respond to this? Sure would like to see enthusiastic headphone listening more popular among the ladies. Hard not to see some gender skew in this activity. What is it about audio that causes so many men and so few women? Serious question.

Yup. In fact they're on the Wall of Fame for being purple good sounding. I also said they're a good ladies headphone ... Philips didn't like that. What!? I should have said they're a great Justin Beiber headphone? Anyway, they sound quite good ... and they're PURPLE!!!

Totally understood and appreciated.

So, is there a cut-off frequency of these isobaric designs? Can the distance be greater than 1/4 wavelength between the two speakers? At 20kHz the 1/4 wavelength is about 4mm. That's pretty close spacing ... but an estat could do it probably. I would think making a full-range driver with this technology would be very difficult.

Absolutely! I've always thought that a keyboard with a pre-amp function for speakers/headphones, and a mix function for phone/computer/analog in would be cool. Mix and match iPhone and computer? Yeah, that sounds pretty cool. It may have to be a bit big, but it could double as a monitor stand and be thin and quite deep with the connectors way in the back. Hell, you could put some class-D amps in it and power the desktop speakers as well.

Thanks. Chaos really. Headphones are already tough enough to design, putting a bunch of extra shit in there doesn't seem to be worth it given what I've heard from multiple-driver and noise canceling headphones. The only legit reason for slappin one headphone over another, it seems to me, is putting isolating muffs or noise cancelers over IEMs. That, I think, may be a reasonable idea. One headphone placed over another is a one in a million crap-shoot. QC15s unplugged over JH13s FTMFW.

NAblur is helping me with tech stuff. ATM it's about amp measurements. But when we're through I'm gonna have him start working on making a macro to modify spreadsheets. (There's some new data ans configurations I want to add.) Anyway, don't worry about getting anything done for me as A) I can't deal with it right now, and once the amp measurements gets going, maybe you and Brian (NAblur) can get together to work it out. Um ... well, if he can't take the light of day he shouldn't be in business.

^^Ha! Happy to be of service, Knucks. Pleasing you with a single picture doesn't remotely begin to pay the debt.

No shit. I couldn't help but spend the 3 hours to make the post. I can't tell you how much I wanted to make it an InnerFidelity post and rack up some page views on it, but I figured that might be cruel.

BTW Wayne, you'll notice I took your moniker for the mod when making the measurements (upper right corner): Hope you don't mind.

Experimental results here.

^^^Wow. I think I have unresolvable mixed feelings about that.

I'll be there. It sure ain't like it used to be.

Okay, I'm an idiot ... but bags are fun. Packing the Red Oxx

I'm with the smart guy. Enjoying it now. The music is really good, but your dancing is only so-so.