Time Domain measurements?

[Joachim Gerhard]

It used a classic Passiv L/R 4 crossover. Today I mostly use 18dB Butterworth in the bass and L/R 2 in the treble.
That way energy storage is less. I am home now but will go into my lab on the weekend and gerate some plots to show the difference.

 

[MZKM]

The measurements must be the Sonics Allegra. The notch at 3.8kHz is a diffraction artifact.

Yeah, it can be seen going away in the non-normalized horizontal graph, so it shouldn‘t be much of an issue.

 

[tuga]

Yeah, it can be seen going away in the non-normalized horizontal graph, so it shouldn‘t be much of an issue.

It would be nice if @John Atkinson could make the non-normalised horizontal graph a permanent part of the invaluable set of speaker measurements he produces for Stereophile.

A second CSD when the tweeter resonates strongly below 30kHz would also be welcome, like he did for this particular speaker:

https://www.stereophile.com/content/monitor-audio-studio-6-loudspeaker-measurements-part-2

 

[QMuse]

Yes, https://www.stereophile.com/content/sonics-joachim-gerhard-allegra-loudspeaker-measurements

Here are also the Stereophile Sonics Anima measurements https://www.stereophile.com/content/sonics-anima-loudspeaker-measurements

Masurements look very good and speakers are really nicely crafted.

 

[Joachim Gerhard]

Thanks, but that was a long time ago. I can do better today and I will send a pair of speakers for evaluation.

 

[thewas]

Masurements look very good and speakers are really nicely crafted.

But rather on the first one, the second has not really nice directivity.

 

[QMuse]

But rather on the first one, the second has not really nice directivity.

True, but when you consider when it was designed it still looks pretty well.

 

[MattHooper]

Thanks, but that was a long time ago. I can do better today and I will send a pair of speakers for evaluation.

Wow, nice to see you hear Joachim!

Unfortunately I have not heard any of your designs since the 90's (we don't get them here in Canada from what I have seen). But the Virgo 2
was one of my all time favorite speakers!

 

[Joachim Gerhard]

Many thanks. There was a really long review that also explains my setup method in part.

 

[MattHooper]

Many thanks. There was a really long review that also explains my setup method in part.

Yes I remember that review well - Fremer did a terrific job of conveying the sound of the Virgos - exactly as they sounded to me as well. Your approach was quite influential for my speaker set up preferences as well as many others.

 

[Joachim Gerhard]

Being at the right place the right time. Maybe ones in a life.

 

[March Audio]

It used a classic Passiv L/R 4 crossover. Today I mostly use 18dB Butterworth in the bass and L/R 2 in the treble.
That way energy storage is less. I am home now but will go into my lab on the weekend and gerate some plots to show the difference.

Can you explain a bit more about "energy storage"

 

[QMuse]

Thanks, but that was a long time ago. I can do better today and I will send a pair of speakers for evaluation.

Btw, have you ever experimented with transmission line design?

 

[Joachim Gerhard]

In my youth. I build a Baily with a 20cm Audax Bextrene. Made a surprisingly deep bass. Worked great on classical music. Today I think the substantial time delay of the lines output is maybe a problem.

 

[MattHooper]

Btw, have you ever experimented with transmission line design?

Transmission line is one of those "sounds good on paper" theories but I've never heard one that seemed to fulfill the promise. All have sounded
a bit plummy to me in the bass. (Pure subjective anecdote, of course),

 

[Joachim Gerhard]

Anti resonance is a phenomenon that I never really understood.

 

[Joachim Gerhard]

Do you like your impedance curve flat ? A simple RCL circuit in a closed cabinet can do it.

 

[Dausend Acoustics]

I am a member of the Klippel Advanced Users Group so I am confident that you can second my measurements.

Hi,

Klippel Advanced Users Group - what is it about? Beside, that I never heard from it, how do you qualify to become a member?

Best Regards
Andreas

 

[QMuse]

Transmission line is one of those "sounds good on paper" theories but I've never heard one that seemed to fulfill the promise. All have sounded
a bit plummy to me in the bass. (Pure subjective anecdote, of course),

Well I have ones that don't sound "plummy" at all. In fact they are able to produce 103dB of 50Hz wave with 2.4%THD measured at my LP 4 meters from them. They have one of the cleanest and most punchier bass I have ever heard.

 

[QMuse]

In my youth. I build a Baily with a 20cm Audax Bextrene. Made a surprisingly deep bass. Worked great on classical music. Today I think the substantial time delay of the lines output is maybe a problem.

But doesn't quarterwave pipe length solve this? I have Castle Harlechs S2 which are twin pipe design, each driver is loading it's own pipe tuned to dfferent frequency and one woofer is firing upwards . I have measure them at various distances from speaker and I'm always getting really nice step response. Subjectively their bass sounds very clean and punchy to me.

Group delay: