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Phillipc, A good instrumentation microphone that is not that expensive is an Earthworks Audio Products 1/4" microphone. http://www.earthworksaudio.com/microphones/m-series/m30/ It is made for what you are trying to do and it comes with the calibration curve. Then you will also need a dedicated...

Undefined, I think we all have made one of those mistakes in the past. Duh. But to worry about the noise in one channel from turning the volume to its maximum level and barely hearing it in the background, I would say that the noise floor is still fairly good. With any normal operation with...

Thank you chipwelder.  The Lm4562 your talking about for a xo or a headphone amplifier I am going to assume. Not as a gainclone type of amplifier. I think your are basing that on its noise floor being lower? And stopped welding those chip amps unless you are really a welder by trade. My mig...

Murray, When I have the time I'll see if I can find the pre-print paper from the AES on the motional feedback design. If I remember correctly there was a patent that went with the design of the circuit and that is probably why you don't see it. I think that it was intended at the time for only...

Darrylo, They sure give a lot of nice superlatives to the material but I sure had to look hard to see that it is a thermoplastic material. I would suspect though they aren't saying it that it is graphite impregnated. Many times these types of bearing materials are made of a filament wound fiber...

fdlsys, I am impressed with the link on your post. I haven't seen much of any of that equipment in a long time. I actually forgot about most of it. I do remember seeing many more Studer multi-track machines in the studios. You never saw a lot of Revox equipment, it was pretty rare to see. Lots...

Steerpike, I remember reading a paper years ago in the AES loudspeaker compilation papers about this. Back then, not to confuse this with the servo output on a chip amp. but it was called a servo driver amplifier and speaker feedback circuit. I have also seen this done with an actual I think...

My question for the group is has anyone actually built the bridged parallel designed amplifier that National Semiconductor has proposed. I am not talking about some other modification such as removing the servo system, but the circuit as proposed by National. And if you have what were the...

I have seen some 21" bass speakers here in the USA but the truth be told most of them didn't have a lower Fs than the 18" speakers that are much cheaper and more plentiful. Why go to the bother of having such a large cone and frame if there is little advantage besides a slight increase in output...

Timber_MG, That is the power of mass marketing. Just mention beryllium and the fact that it is just a plating doesn't even enter the discussion. The same goes for the foil beryllium from Brush Wellman. They do have an alloy that they call Alba-Met and it is mostly aluminum. They at least readily...

Shonver, I looked again at the Creative Sound web page and can read that alright, but as soon as I head to the data page up pops the warning from Trend Micro so I can't look at that. I have nothing against silk or for that matter some of the better polyester soft domes, actually those would be...

Shonver, I am not the person that you are referring to, but a few comments anyway. I tried to look at the sites that you have mentioned and got a big bad warning from my virus protection not to visit those sites as they were known to have a problem per Trend-Micro. You have to be very careful...

Ludo, Don't worry about being verbose with me, I generally have a problem keeping my answers short myself. The cost of the LM4562 opamps here without trying are about $3.00 US dollars apiece and that was without looking around for a better price. Since they are dual opamps that mean only two...

Hello to Murray. The answer to the question on crossovers is that I always go with a Linkwitz-Riley fourth order crossover. I have used these in my passive crossovers. with perfect layer large gauge inductors and also polypropylene high voltage capacitors with multiples in parallel. For the...

Gerhard, I may just take you up on that. I am going to look at writing a preliminary patent application before I do anything. I should protect the cone material and also the motor design for the cone loudspeaker. I don't know that I will have much I can patent as far as the dome tweeter when I...

Let's see which questions that I can answer at the moment. I will see about putting up some pictures of what I am doing I will have to scan something into the computer. As far as the beryllium tweeter that I am working on it will use a Brush-Wellman foil type diaphragm.  There are few companies...

Just to say hello to this group from Los Angeles California. Joining the group to learn new things. I am a designer of loudspeakers and waveguides. Anything I can do in that regards I will gladly do. I am here to learn more in regards to amplifier and active crossover design. Electronic is not...