I've sent the following summary of my thoughts on several of the top universal IEMs by PM twice already, so I figured I'd post it in the forum. Note that these are only my impressions based on my ears, and will most definitely differ from what other people hear...

Does anyone have sound clips or know of music tracks that can really stress an amp into clipping? I just built a Nelson Pass Balanced Line Stage preamp and have suspicions that with the default gain, with a potentiometer only at the output, the amp may be clipping with an input level that is too...

Two thumbs up, if you're into punk and like Goldfinger's past albums. The entire album is awesome, IMO.

For anyone who's fond of Henry Kloss' audio products, etc.: http://www.msnbc.com/news/700007.asp?0dm=T238T

I was enjoying what I heard from my ER-4S with the white flanged tips until I figured I'd try out the foam eartips earlier today. Now I'm in love with the sound. A question about the foam eartips though: One end has the open cell foam exposed while the other end has been sealed so it's...

After listening to Beyerdynamic DT770's for over a day, I keep wondering if I should just keep these and sell my Sennheiser HD600's, but some characteristics of the DT770's restrain me from that idea. What I like about the DT770 is its bass power, the kind of impact and feeling that I'm...

I started assembly of a Gilmore PSU circuit and wanted to just test out the toroid PSU and diodes to see how much DC voltage I would get out of each of the secondaries. The toroid's specs are, 2 18V secondaries at 5 Amps each. The diodes are 600V, 8 Amp Hexfreds, with one full bridge for each of...

Anyone know of any complementary positive and negative voltage regulators that can output 5A? Right now, the power supply I want to build is limited to 3A with a LT1085/LT1033 pair. I've seen a voltage regulator or 2 that could output 5A, but only come in the positive variety.

I'm planning on making an external power supply that I can use with all of my amps, one at a time, like how the X-PSU can work with all of those different Music Fidelity units. The circuit I currently plan on using is the dual supply Kevin Gilmore uses for his Class A amp for dynamic headphones...

I'm looking for some known-to-be-good designs for DIY DACs. aos mentioned the SDS DAC from Sheldon Stokes, as did many posts in a deja.com search, but the linked webpage no longer exists (something like www.clarkson.edu/~sstokes/blah). I did get a glimpse of a finished SDS DAC, but forgot...

I'm looking to buy a toroidial transformer to maybe make a dual purpose power supply: 1. providing a clean high current (maybe 1.5 amps or so) +15V to power my Szekeres amp in one mode, or maybe a dual supply at +-15V for something else 2. power a virtual battery supply that'll keep NIMH...

Can an op amp or buffer IC be blown if opposite voltage is applied to the Vcc's? i.e. positive rail connected to V-, and negative rail connected to V+?

I was wondering what the effect of using a capacitor like the Solen/SCR Fast Caps in the signal path of an amp would be. I noticed almost everywhere that sells the Solens, or anyone who talks about them in a deja.com search shows that the Solens are good for speaker crossover circuits or used as...

How does one go about grounding those pots from Alps and Noble which are enclosed in a box-type case? I've finished my Apheared #42 (took a day off from work to assemble it) and it worked almost perfectly on the first try! I just have a noise problem with the pot at near-full volumes and...

I'm trying to fit a wall wart I rewired to 40V to work with the Apheared #42, which uses a TLE2426 as a virtual-ground driver. I'm regulating the voltage of the wart down to ~18-19V before feeding it into the TLE2426, but I don't know how much current is going into the TLE2426, but I would...

How is the Corda's volume control? Does it have uneven volumes between channels at low volumes? Is it noisy while turning? I'm asking because I want to evaluate the Alps pots (the same blue type the Corda uses) for a few of my DIY amps and have a choice between the Alps and the Noble pots of...

The digital pot, DS1802, that I'm using is very sensitive to emissions from the power supply circuit I have. The closer the pot is to the circuit, the louder I can hear a clicking noise, a little farther away the clicking completely gone except at certain volume steps. Is there some kind of...

Anyone know where to get the cable connectors that go into the drivers of the HD600/HD580/HD565/HD545/HD535's? I'm thinking of making my own Clou cable clone since I don't think it looks too hard. According to the Clou website, the conducting wire is silver-plated copper with teflon insulation...

I'm thinking of adding Jan's crossfeed circuit to my Szekeres amp (DC coupled with a gain stage). I remember Tomo telling me I might need to use a buffer before the crossfeed, and the circuit would be before the input of the amp's gain stage. Is this right? Would a buffer based on BUF634 be what...

Has anyone ever made available the schematics for the MG Head or any of the other __ Head variations out there?

I couldn't find anything on the AGK-acoustics.com website about this - are any of the parts of the AKG K501 replaceable? The cord seems like it's attached very firmly and doesn't seem replaceable at all, but what about the earpads? Something like this might determine whether I want to keep them...

Recently, after I added a digital pot (the DS1802) to my amp in place of a Panasonic that used conductive plastice, I noticed 2 situations where I would get noise, or more noise than before: 1) When I move through certain areas of my room with my headphones on, I would here very soft...

Does it matter what range of resistor values you use for a voltage divider, whether it's in the tens, hundreds, or thousands of ohms range? I've run into this problem twice, once a few months ago and once just last week. If I used a certain range of resistor values for a voltage divider, the...