John Curl's Blowtorch preamplifier part II

[jan.didden]

You mean people actually pay money for this kind of trash??
Honky midbass, glaring highs?

Jan

 

[john curl]

You don't look too hard at a gift loudspeaker, but I would prefer THIS frequency response if I could have it:

 

[jan.didden]

You don't look too hard at a gift loudspeaker, but I would prefer THIS frequency response if I could have it:

Actually I would be somewhat insulted if I was presented with a junk gift.

 

[john curl]

Well, beggers can't be choosers! '-)

 

[gpapag]

"I believe in extended bandwidth, without a sharp cut-off."

If one were to take Heyser's view that "time", not as in seconds but down to fractions of wavelengths were more important than generally assumed, then in addition to a change in amplitude, the sharper corner also "acts like" more of a change in time which might be audible AS WELL AS the change in amplitude.

Not as technical or mathematically backed as JC posts but we can say that R.H. did try to convey a message

http://forum.zelfbouwaudio.nl/download/file.php?id=41950

https://community.klipsch.com/forums/storage/3/1027018/6904heyser.pdf

George

 

[john curl]

I was at the AES when Richard Heyser gave this paper in 1969. Paul Klipsch actually protested from the audience. '-)

 

[john curl]

And what loudspeaker would you recommend, Jan?

 

[jan.didden]

And what loudspeaker would you recommend, Jan?

Something like this I find much better sounding, although the low mid is still a bit hot to my taste.

Jan.

 

[john curl]

Something like what? Jan?

 

[bcarso]

JBL M2?

I haven't heard this yet but reports are positive. The JBL M2 was described by one person as the most accurate loudspeaker he'd ever heard.

 

[godfrey]

Something like this I find much better sounding, although the low mid is still a bit hot to my taste.

Missing link?

 

[jan.didden]

Missing link?

Sorry, fixed: http://www.diyaudio.com/forums/loun...ch-preamplifier-part-ii-6428.html#post4275704

Jan

 

[john curl]

I must admit that the JBL looks great in measurement, and I have heard a version at a CES that sounded great too! I don't work for JBL any more, so I have no 'inside' way to get one. '-(

 

[john curl]

I call a falling response after 15KHz or less, a speaker in need of a tweeter.

 

[jan.didden]

Something like what? Jan?

You mean brand? It's one of my own designs, a wideband driver in a reflex enclosure with a simple baffle step correction.

I did a SpeakerCamp on it with a group of people. We also took care of very simple, fast and perfect assembly. Less than a day to build a pair with no experience. People loved it.

Jan

 

[john curl]

I didn't know it could be so easy. I spent 6mo on a 3 way design, myself, and found it not to my liking.
Is that just one cone that does everything?

 

[john curl]

I am now listening to the Sasha speakers, and they sound pretty darn good. I can easily compare them to Sequerra Met7's. The Met7's are more forgiving of the source material, good for general listening.

 

[jan.didden]

I didn't know it could be so easy. I spent 6mo on a 3 way design, myself, and found it not to my liking.
Is that just one cone that does everything?

Yes it is. Of course, the power is limited, but it is fine for a not too large living room and below-ear-splitting level. Tonal balance is very natural, no perceptive loss of deep bass or ultra high. Its a matter of perspective: you can say, wow, it rolls off 5000 Hz at the top; but if you know anything about perception you know you really roll of less than 1/2 an octave of a 10 octave span.

I think the greatest virtue of such simple designs is the total absence of xover filters with all their issues, problems and infinite re-iterational 'improvements'.

Attached just for fun, one of our listening test sessions. Totally uncontrolled The square white ones are Morgan Jones' Arpeggio's.

Jan

 

[SY]

The square white ones are Morgan Jones' Arpeggio's.

The originals are bright red, so they probably sound better.

Cynthia badly wants me to get rid of my current speakers and replace them with the Arpeggios.

 

[jan.didden]

Our friend Raymond was responsible for the mech design - perfect assembly!
Some pics of the SpeakerCamp event.

Jan