Børresen M1

[Marin]

Generally, inductive drivers will have a less extended high frequency response.

Funny you say that because of how Andrew Jones crossed them so high...

Obviously acoustic crossovers is lower...

This is anechoic response off driver

Maybe he wanted to take advantage of the natural decline of drivers, that makes sense to me?

 

[Marin]

Generally, inductive drivers will have a less extended high frequency response.

Also, because inductance isn’t really a static value (it changed with excursion), a lower values means less change, which generally leads to a more linear behavior.

I think there is also a lot of myth around high and low Le drivers, most of which is due to simplifications or misunderstandings.. in the end, it’s just one of the many aspects of a driver, and they must work together to be of value for a specific use case.

And thank you for the answer, I didn't know anything about this.

 

[Marin]

Distortion matters. It's not forgotten. Toole has measured distortion extensively, including human audibility/perception. He also has data and discussions on CSD (for instance, since we are commenting on it). You just need to keep things in order of actual importance.

You have to first get the frequency response right, that is of primary importance, both on- and off-axis since both direct and reflected sound is critical. Børresen so spectacularly fails to get FR right, the rest is immaterial and many of the follow-on observations are polluted by the dramatic FR issues, it's actually so bad it makes the CSD graph look OK to your eye, except for that razor sharp 80Hz high-Q woofer response that goes on to infinity, and the fact that there are odd things going on at ~400Hz and ~2kHz that are suppressed by the speaker's horrible frequency response and would be very prominent if someone tried to EQ it to flat, even if it is unlikely this thing could be EQ'ed even close to flat. In reality this is a one-note bass speaker, will sound in the showroom like (perhaps) tight drum sound, potentially leading the customer to gush over how real the drums sound ("wow!", "the dynamic trimbrality", "PRaT", "feet were tapping"). In reality, this one-note bass speaker will ring the customer's listening room like a bell (see the CSD plot) and literally sound sickening if there is a room response peak aligned to the speaker's peak. Customer will likely be moving the speakers around their room, commenting on how veils get lifted with each new randomization of position. A $30 USB measurement mic would tell them what was really happening, and inform them of how bad these speakers are, but the target customer would never use or understand the simple measurement results.

In reality, Erin introduces confusion rather than aid the conversation by publishing these occasional ad-hoc CSD graphs since he doesn't stick to a convention of time and amplitude response. I do like his reviews, not bashing on him, but some info leads us down the wrong path without context and these CSD are in that category.

Hi, I couldn't help but respond to this comment.
So much useful stuff can be learned from it.
Do you think that one-note bass is because of low motor power(BL) of driver that is used in port design?