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Old 28th June 2012, 10:55 PM   #6501
gpapag is offline gpapag  Greece
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Thank you for the link, George, but I am not about to get into the design process of speakers. I think my fascination with preamp and amps is more than enough, in addition to what I do, which is maing power line filters. .
I wish I could keep your determination and focus on a single diy subject for more than a week

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Besides, I already own a pair of AR94, which have been completely overhauled and a little upgraded (e.g. pure silver wiring inside) AND a pair of JBL Ti600 speakers, plus my own, B&M Audio 1041 Monitor.
Regardless.
The book is a collection of Thiele/Small papers laid down in a way from easy-basic to more detailed-advanced.
A good mind journey even for the summer time.

George
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Old 28th June 2012, 11:03 PM   #6502
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1) Copyrights will last as long as Disney can milk Mickey Mouse.
I heard the heirs and assignees of Cole Porter ante up a bit too.
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Old 28th June 2012, 11:09 PM   #6503
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Originally Posted by a.wayne View Post
Are they better than Bose ...
I can see it now the "Insane Clown Posse" Bose special edition. Every jugaloo must have one.
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Old 29th June 2012, 06:48 AM   #6504
dvv is online now dvv  Serbia
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I wish I could keep your determination and focus on a single diy subject for more than a week
Ela, George, which is very likely Yorgos, that's not fair. I am still very much and completely (in the sense that I am doing nothing alike of the kind) commited to the amp project, primarily because I want it for myself.

However, this is a fun (non-business) project, and therefore, it must take a back seat to regular business and family activities, which are very numerous and demanding at the moment. As far as I can see, the first time I will be able to dedicate say three straight whole days to it is when I get down to Kassandra, town of Afitos, hotel "Blue Bay", August 7 and onwards.

Besides, I never even remotely planned on chaging my speakers, I'm too happy with the ones I have. I am not the swiftly and frequently changing type.

Quote:
Regardless.
The book is a collection of Thiele/Small papers laid down in a way from easy-basic to more detailed-advanced.
A good mind journey even for the summer time.

George
True, quality knowledge is never amiss, who knows whe one might need it.

But, for my wife and me, summertime is Greece time above all. 10 days of net stay (not counting the day to get there and the day to get back) in Greece is a sort of family tradition, we've been at it since 1994, and I personally since 1970. Pool and sea for me, shopping in (Thes)Saloniki for the wife, you get it, everybody's happy. Wife claims the Ikea there is the best she's ever seen, and trust me, she's seen a lot of them.
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Old 29th June 2012, 07:03 AM   #6505
dvv is online now dvv  Serbia
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Originally Posted by scott wurcer View Post
I can see it now the "Insane Clown Posse" Bose special edition. Every jugaloo must have one.
There you are, Scott, I was kinda wondering where had you gone.

Don't you guys think you're being a little too hard on Dr Amar G. Bose? I mean, he has bills to pay, so he needs to make and sell what people will pay for, and what we think of it is of no concequence even if we were buyers ourselves.

Also, please remember that he is of Indian descent, and Indians have been a trading nation way longer than even the Dutch. In a museum in Amsterdam, I was told that the Dutch had become a true trading nation in the 14th century, with chamvers of commerce and such like well under way by then. I mean, everybody traded, but they were the first in Europe to truly institutionalize trade.

I must admit I was never a fan of Bose gear, I never liked their 301 and other speakers, but they sold, like it or not. To my ears, AR was way better, but today, AR is gone and Bose is still going strong, so they must be doing something right, they adapted, whereas AR obviously didn't.
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Old 29th June 2012, 08:21 AM   #6506
gpapag is offline gpapag  Greece
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Originally Posted by dvv View Post
Ela, George, which is very likely Yorgos, that's not fair. I am still very much and completely (in the sense that I am doing nothing alike of the kind) commited to the amp project, primarily because I want it for myself…..


Dvv
It was fair but it was written in a wrong way, my english you see… (I wish I had your determination for to be able to focus like you on a single diy subject for more than a week ). My apologies

My best wishes for your vacations at this very nice place (Chalkidiki)

George
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Old 29th June 2012, 08:49 AM   #6507
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Originally Posted by popilin View Post
What is the optimal damping factor in an amplifier, in order to get deep bass?

The optimal damping factor is the damping factor for which your loudspeakers are designed.

vac
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Old 29th June 2012, 08:59 AM   #6508
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Bose . Great ideas sabotaged by not going the extra mile with components ( I am being diplomatic now ) . The 901's can work . Problem is mostly due to customer misunderstanding they don't . 901's with a super tweeter might be very OK . A friend bought a Fostex full range unit . As good as it is the fundamental problem is still there ( about 5 kHz ) . I would recommend a 7 kHz crossover to the super tweeter and a pair of what people call sub woofers from 10 to 100 Hz to partner them . As for the equalizer , best say nothing . Best sound heard with them was in a church in Belgium and Kirkland's wine bar Liverpool . My PA friend says " no highs , no lows , that's ..............."
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Old 29th June 2012, 09:21 AM   #6509
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Originally Posted by vacuphile View Post
The optimal damping factor is the damping factor for which your loudspeakers are designed.

vac
I used to spend a lot of time reading the archived Wireless World magazines at what is now Oxford Brooks University .

The test they did although primitive was interesting . A small wire touching a metal strip on a bass unit . They found a damping factor of 3 to work as a minimum . This was I think 1955 . The suspension of the speaker I suspect would have been much stiffer than now . The testing was done with a full understanding of the problem and not by some armature .

When the British Hi Fi press looked at this many years ago I seem to remember 16 was held to be where cables mattered more . The use of a series resistor on a normal amp ( damping factor > 100 ) will tell you much of what you want to know . Sid Smith of Marantz though some of the sound of tube amps was down to that alone . Some say it helps the negative feedback work better in the amp . Seems very likely it would . I think a resistor preferable to the usual choke if the amp allows . Big resistor small choke perhaps ideal ? 1 ohms seems OK to me . For choke 5 turns 1 mm x 10 mm air cored . Try earthing your speaker metal work also . It costs you nothing to try . Perhaps 2 x 1K non inductive to RF " hum-buck" it ( speaker +/- to ground , or caps ) ?

Slightly under damped is usually nice . Especially if the speakers are correctly damped ( what your computer said was correct ) . The BBC used to say LS3/5A was critically under damped . Some who think the LS3/5A to be the world most accurate speaker might be surprised by that ?

BTW , please don't tell me WW were wrong . They weren't as at least they were trying to test the reality of the concept .

Last edited by nigel pearson; 29th June 2012 at 09:26 AM.
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Old 29th June 2012, 10:47 AM   #6510
dvv is online now dvv  Serbia
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Originally Posted by gpapag View Post
Dvv
It was fair but it was written in a wrong way, my english you see… (I wish I had your determination for to be able to focus like you on a single diy subject for more than a week ). My apologies

My best wishes for your vacations at this very nice place (Chalkidiki)

George
The key of completing a DIY project, in my view, is patience. One has to know exactly what comes first (family), what second (business), what third (friends) and what last (DIY games).

When I started out in April, I was clear on the fact that I will complete it effectively by the end of the year. This does not bother me, as I am doing this in an all out attempt to make myself and whoever else may want to make it, something as much out of the ordinary as I am able to do.

And things are moving along. I have purchased all necessary semiconductors, and am now down to making the PC boards. I have been interrupted by important family events, but never mind, I'm still firmly on the road, as soon as it's over, I'll just pick up where I stopped and continue.

As for Chalkidiki, I am almost a local there, every summer since 1994, this is my 16th time, two years in between were pauses. Afitos in particular - this is the 8th time in a row, 6 times in one hotel, and last year and this year in another, we think a better one overall.

I toured Greece in 1970, with my late parents - 21 places, from the eastern Turkish border to the Ioniona sea, down to Sparta. I had spent a whole year studying Greek democracy for my A levels in England, in particular the Athenian democracy, which was later the exact topic of my A level paper, which I graduated on in 1971.

Lastly, NEVER forget that to us Serbs, Greeks are really something like distant relatives, cousins. When the Slavs settled on the Balkans in VII century, it was the Greeks who gave us our language, customs and religion. Our Cyrrilic alphabet enables me to read each and every sign in Greece, even if I don't know what it actually means. In short, in Greece, I do not feel as if I am in a foreign country, more like visiting cousins.

Why else would I go there 16 times?
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