Supposedly? He says yes...
http://www.linearaudio.nl/JDpubs/Interviews/DiddenInterview_MMM110.pdf
jan didden
Some days I have a six hour drive to work. Other days it is 15 minutes and I can listen to the FM station I built, almost no compression and they play music I like.
Where I am staying at the moment it had 55 dba background noise level. I mentioned the heating system was too noisy to the manager of the place. He checked it out while I was gone, but I did leave my Bruel and Kjaer second generation sound level meter kit where he saw it. Now it is down to 42 dba. So my car is not far off of some apartments.
I thought the Adcom stuff was particularly nice, but it wasn't very successful,
possibly because we chose a sound which was good in a listening room,
ignoring the popular car audio aesthetics of the time.
😎
possibly because we chose a sound which was good in a listening room,
ignoring the popular car audio aesthetics of the time.
😎
In my experience that's pretty typical for the US and tropical countries where air conditioning is everywhere; in a premium limo background noise level may easily be much lower than that. Good point!
Hannes
in the pdf attachement you will find a audio power amplifier topology, that I have only find in this German amplifier models for car audio:
1) AMA Stereo 50
2) Protovision 264/Protovision 284
3) Smart Devices Stereo MkII
4) Alphasonik David 265
All this amps sounds very fine if the temperature is approximately 50 degrees but it seems to be very sensitive against variuos unwanted parasitic effects, because a lot of damage devices there are, as to read in various German audio/hifi forums.
Is this topology a slightly modified version based on a certainly topology from Threshold/Nelson Pass?
What I miss is the requirement for bias adjust and bias stability or bias servo unit like
http://www.freepatentsonline.com/5055797.pdf
1) AMA Stereo 50
2) Protovision 264/Protovision 284
3) Smart Devices Stereo MkII
4) Alphasonik David 265
All this amps sounds very fine if the temperature is approximately 50 degrees but it seems to be very sensitive against variuos unwanted parasitic effects, because a lot of damage devices there are, as to read in various German audio/hifi forums.
Is this topology a slightly modified version based on a certainly topology from Threshold/Nelson Pass?
What I miss is the requirement for bias adjust and bias stability or bias servo unit like
http://www.freepatentsonline.com/5055797.pdf
Attachments
Last edited:
That's interesting. I developed a minimum peak hold detection circuit
for biasing output stages right about the same time. It comes from the
observation that in a push-pull follower the bias figure will be the minimum
voltage value from emitter to emitter. I recall that a prototype went to
CES, but by then I was on my way out the door. 😛
There are a couple of other very cute circuits for this sort of thing, but
modesty and greed prevent me from disclosure at this time.
😎
for biasing output stages right about the same time. It comes from the
observation that in a push-pull follower the bias figure will be the minimum
voltage value from emitter to emitter. I recall that a prototype went to
CES, but by then I was on my way out the door. 😛
There are a couple of other very cute circuits for this sort of thing, but
modesty and greed prevent me from disclosure at this time.
😎
Ohhhhh 🤐 That remark will get the hen's clucking all night long....🙄
Maybe a good thing tho - it's been pretty quite around here lately....
I had 4 adcoms I cannot remember the model numbers, but they were the best car amplifiers I have ever owned, I miss them lol one was three feet long they sounded amazing
Today I run a Soundstream MC140x in my car, and I've been telling people it's design roots are of Nelson pass. I beleive the MC series of amps were similar to the Dxx series of the time - MC being the higher end. Its a Class-B design using TIP102/107 otuputs.
Am I correct in calling this amp a Nelson Pass?
Am I correct in calling this amp a Nelson Pass?
perhaps the 4702 resp. GFA4702
Analog Art Car Audio Club :: Æ[¬Ý¤å³¹ - ADCOM 4702 AMPLIFIER
http://www.diyaudio.com/forums/car-audio/180462-anyone-own-any-adcom-car-audio.html
I like outdoor power supplies for amps, both for home and car audio
F5 in Car
F5 for car amplifier. Thanks Mr.Pass for making this possible 🙂
First step is to look for a suitable heatsink. Ordinary car amplifier heatsink won't hold the heat. An industial heatsink is more suitable
F5 for car amplifier. Thanks Mr.Pass for making this possible 🙂
First step is to look for a suitable heatsink. Ordinary car amplifier heatsink won't hold the heat. An industial heatsink is more suitable
Attachments
Hi, Tiefbassuebertr
I bought the heatsink here in Indonesia.
Hi, Chandm,
Yes, it is the first (maybe others have done it 🙂 )
I bought the heatsink here in Indonesia.
Hi, Chandm,
Yes, it is the first (maybe others have done it 🙂 )
If I know the name of manufacturer, I can try to find out, if there is a distributions network in Europe.
Could you post a build up of this amp. How do you like the sound in car? Did you design and build the SMPS yourself? I know that I would love a car version of the F5 as well as a few others. i have a pair of compression horn drivers that would work great with an amp like this in my car.