Modern speakers vs Vintage speakers

[DasguteOhr]

I have no interest in discussing the merits of various specs, but if you wish to bring specs into any discussion, please acknowledge them appropriately. In electronics, slew rate is defined as the change of voltage or current, or any other electrical quantity, per unit of time. I think I appreciate what you are trying to say about 0.3µs, however my understanding is that is not a slew rate, but rather a rise time of the square wave signal. The rise time, settling time (equally important!) and slew rate all contribute to the "speed" of an amplifier. The 0.3 µs you quoted is quite fast, although there are many amps that are faster. The Spectral 400 for example has a rise time of <225 nanosec (or 0.225 µs). While an academic discussion of these parameters is interesting and fun, I learned a long time ago they may or may not contribute to how an amplifier ultimately sounds, or more importantly, how it ultimately pleases the listener in a given system.

we mean exactly the same thing, just use different words. I find it difficult in English.
shows the rising edge of the 1 kHz square wave signal. The rise time is usually measured between 10% and 90% of the amplitude. The oscilloscope conveniently calculates the rise time with 1.578 nanoseconds. The slew rate of this signal is 709.8 megavolts per second. Converted to the usual volts / µs, this results in: 709.8 volts per microsecond. The Analogscope user has to count the tick marks of the scaling and calculate the delta y by delta x. The true square wave is even faster because the oscilloscope adds about 800ps. Such a rate of rise of the test signal is already more than sufficient for a hi-fi amplifier. It is very nice to see the clean transient process of the square-wave signal with very little overshoot, these are of a similar nature as in Figure 1.
i don't want to continue the topic now if you are in germany. I like to measure your amplifiers. sorry off topic.

 

[marty]

we mean exactly the same thing, just use different words. I find it difficult in English.
shows the rising edge of the 1 kHz square wave signal. The rise time is usually measured between 10% and 90% of the amplitude. The oscilloscope conveniently calculates the rise time with 1.578 nanoseconds. The slew rate of this signal is 709.8 megavolts per second. Converted to the usual volts / µs, this results in: 709.8 volts per microsecond. The Analogscope user has to count the tick marks of the scaling and calculate the delta y by delta x. The true square wave is even faster because the oscilloscope adds about 800ps. Such a rate of rise of the test signal is already more than sufficient for a hi-fi amplifier. It is very nice to see the clean transient process of the square-wave signal with very little overshoot, these are of a similar nature as in Figure 1.View attachment 86075
i don't want to continue the topic now if you are in germany. I like to measure your amplifiers. sorry off topic.
View attachment 86076

Got it. Agree, we're differing on terminology mostly. Nice bench!! I gave up my oscilloscope 10 years ago because I couldn't figure out what mattered and what didn't sonically!! It was an exercise of futility in my limited understanding of technical things. Better to focus on the listening I think.

Too bad I'm not in Germany. I'd like to hang in your lab and try playing with some stuff. We would have fun!

 

[thomask]

Japanese audiophiiles play Altec A7 in small room to pretty good effect.

 

[thomask]

This person is doing bi amping with self made analog crossover in very small room.

Teac TN-400 Turntable, Technic ESA-99 tonearm, ZYX 50 cartridge. Ortofon ST90 step up transformer, Ear 834p phono. Preamp: Audio research SP15 Bi-amp: DIY single end EL156 drive Altec 806B with 511 horn and JBL 075. White Audio labs B? Class A 50W drive Altec 418B DIY 3 way crossover 2nd order at 500hz and 5000khz

But it sounds musical.

I think bi amping is the way to go.

 

[thomask]

The bass sounds clear in very small room.

 

[thomask]

June Christy;s something cool is a famous one as "Cool Jazz".

Unfortunately she was battling alcoholism and died at age of 65 due to kidney failure.

 

[thomask]

Julie London and Jacinta's performance also sounds well through my Altec A7

digital crossover at 500hz, Fostex supertweeteer at cut off of 13khz.

Cayin 300b pp for treble and Crown Xls for bass

 

[thomask]

same as above except Line Magnetic 508 to drive treble horn

 

[Argonaut]

Thomas … I admire your enthusiasm … However , if the last few recordings of other guys Altec A7 systems , representing a much more sold and corporeal upper midrange compared with yours, do not impress upon you that you have your horns in a very much less than optimal position in your room … I just do not know what , I am sorry to be blunt but your A7’s sound like they are fighting for their lives in a resonant Tin aircraft hanger by comparison.

 

[thomask]

Thomas … I admire your enthusiasm … However , if the last few recordings of other guys Altec A7 systems , representing a much more sold and corporeal upper midrange compared with yours, do not impress upon you that you have your horns in a very much less than optimal position in your room … I just do not know what , I am sorry to be blunt but your A7’s sound like they are fighting for their lives in a resonant Tin aircraft hanger by comparison.

Let us see what happens when I use analog active crossover next week.

My setting emphasize clarity. Thus Altec A7 may sound closer to modern speaker rather than typiical vintage sound.

Another thing is that Galaxy note 20 ultra does not capture all the beauty of its sound like ambience.

I may need to get better microphone to record music.

I will invite few people around the end of this year.

They will witness how it sounds.

 

[jespera]

Wify and kids out of town for a few days so things happened in the house:

Tannoy liberation

I’ve owned and loved a set of 15” monitor golds in original rectangular york cabinets for about 8 years. About a year ago i upgraded the crossovers to a special design by the ukranian maestro Abbas Zulfugarov. Certainly well worth it. Today i took another step in tannoy liberation by...

www.whatsbestforum.com

Also these 1976 la scalas sneaked into the gym:



Central command is going to be ecstatic.

 

[Addicted to hifi]

Wify and kids out of town for a few days so things happened in the house:

Tannoy liberation

I’ve owned and loved a set of 15” monitor golds in original rectangular york cabinets for about 8 years. About a year ago i upgraded the crossovers to a special design by the ukranian maestro Abbas Zulfugarov. Certainly well worth it. Today i took another step in tannoy liberation by...

www.whatsbestforum.com

Also these 1976 la scalas sneaked into the gym:

View attachment 86164

Central command is going to be ecstatic.

Very nice.i love vintage la Scala.

 

[Solypsa]

once you show that new 'six pack' after dancing to the La Scalas all will be forgiven

 

[MarcelNL]

We had a little audio gathering last evening, listening to my music server prototype connected to an AN 300B amp, and two KL405 VAC in large open baffles....even without a tweeter and only one woofer per channel that setup is ridiculously good!
Even the neighbors likely enjoyed the SQ as they waited until 2AM before asking if we would turn the volume down a bit.

 

[Solypsa]

So you have the 'six pack' of Tesla's and a pair of kl405? Awesome...

 

[MarcelNL]

wish I had, I missed the window of opportunity to allow buying KL405s at reasonable prices, my best friend has a bunch though.
Recently prices for KL405 went ballistic, now near 2k a pop

(he hoards audio exotica, in the few hours we listened he whipped out a VdH grasshopper with gold coils and a Koetsu Lapis while discussing cartridges , a slew of extremely rare tubes when we did some tube rolling and about a dozen of rare recordings/first pressings to show me what to find on Qobuz.)

 

[thomask]

Relaxed as listening to sweet Jazz music.

As an audiophile, I can nit pick sound, but it sound musical as is.

 

[thomask]

I received PAP-C1 analog active crossover designed by Nelson Pass on 8:30 PM yesterday delivered by UPS.

PAP-C1, Custom Active Analog Crossover for Open Baffle - PureAudioProject

www.pureaudioproject.com

I could adjust the crossover frequency to 500hz only this morning after getting right hex.

After connecting output of Chord Dave and Mscaler, it seems to sound coherent and musical.

They claim warmup time of 24 to 48 hours for full sound.

But initial impression after one hour warm up is quite good.

Thanks Stephan for letting me know this product.

 

[DasguteOhr]

View attachment 86489

I received PAP-C1 analog active crossover designed by Nelson Pass on 8:30 PM yesterday delivered by UPS.

PAP-C1, Custom Active Analog Crossover for Open Baffle - PureAudioProject

www.pureaudioproject.com

I could adjust the crossover frequency to 500hz only this morning after getting right hex.

After connecting output of Chord Dave and Mscaler, it seems to sound coherent and musical.

They claim warmup time of 24 to 48 hours.

But initial impression after one hour warm up is quite good.

Thanks Stephan for letting me know this product.

My pleasure,
is a good toy, especially in the important midrange you can change the tuning significantly. from laid back for long, stress-free listening to attention to detail.

 

[thomask]

Although Pap-C1 active crossover need more than 2 day's of break-in, I upload one video for those who are curious.

Cayin 300b pp fitted with Sylvania 6f8g(6n7s variant), Amperex ECC82, Telefuken ECC83, Psaven Acme 300b is used to drive treble horn.

Crown Xls2502 is used to drive bass horn.

Chord Dave and Mscaler is used as Dac.

CD ripped and stored in SSD of Cocktail Audio X50d is a music source and Denafris Gaia DCC is in between X50d and Mscaler.

It sounds very transparent with clean details.

As Pap-C1 get broken in, it may sound more nuanced.