John Curl's Blowtorch preamplifier part II

[Wavebourn]

Originally Posted by john curl

In the last 2 days, I talked to two of my associates who helped design and run the GD PA system those 40 years ago, and we all laughed at the response we got from JBL at the time. They did NOT appreciate our input, then. Later, they discovered a way to improve things. That is the way of things. '-)

The way of things is, they exploited design and fashion that J.B.Lansing made common back in 1930'th when he manufactured speakers for moving pictures. He got it in turn from gramophones that were already common then so nobody questioned the decision.

It is inertia John.

[Esperado]

Originally Posted by Wavebourn

It is inertia John.

They are still alive. How much of their 1970's competitors all over the world ?

[jneutron]

Originally Posted by Wavebourn

It is inertia John.

There is also the possibility that they did not have the talent to understand what it was JC was telling them, understand it, model it, and fix it.

jn

[morinix]

Originally Posted by jneutron

There is also the possibility that they did not have the talent to understand what it was JC was telling them, understand it, model it, and fix it.

jn

While I was at Harman/JBL I saw firsthand the pushing aside of some really smart engineers. It was just like school clique stuff.

[jneutron]

Originally Posted by morinix

While I was at Harman/JBL I saw firsthand the pushing aside of some really smart engineers. It was just like school clique stuff.

Smart engineer...

Isn't that an oxymoron??

jn
ps..and yes, I'm an engineer.

[Wavebourn]

Originally Posted by jneutron

There is also the possibility that they did not have the talent to understand what it was JC was telling them, understand it, model it, and fix it.

Or may be they had a talent that understood that for continuing the business it is better not to stop production that is still in demand for the majority of potential customers in order to satisfy one of them.

[Esperado]

Originally Posted by john curl

Then note the distortion and see that it INCREASES with frequency significantly.

Happily, musical power level contents decrease with frequency, in the same time.

[Wavebourn]

Originally Posted by Esperado

Happily, musical power level contents decrease with frequency, in the same time.

Statistically. But we don't listen to a pink noise, do we? While sales people on JBL don't sell stuff to individuals, they sell for masses and measure success statistically.

[Esperado]

About JBL, why to be crossed about them ? They produced quality pro speakers, well manufactured. And even if i don't liked the sound of their 70's monitors enclosure, i have to admit they allowed to produce very good mixes, at the end. For a freelance sound engineer, it is easter to work, form a studio to an other, with the same reference. In post prod movie auditoria, in France, we use to even tune the volume to a standard same SPL for 0dB. All that explain this inertia you are referring to.

About Horn, they are only a very effective way to increase efficiency, as well to control directivity. We don't have to confuse our comments about horns with comments about the driver behind (compression Vs cone).
Adding a (good) horn to any speaker just reduce distortion because it will run at less power for the same SPL. And better damping.

[john curl]

Tu et feu! '-)