Harbottle Audio C18L2 personal review

[Harbottle Audio]

Good evening, @Harbottle Audio !. Is this the LDLC to which you refer?


Hz SPL % THD dB COMPRESSION
LDLC %THD dB Compression 2nd order 3rd order 4th order 5th order
10 38 1 -10 -15 -20 -25
12.5 35 1 -11 -16 -21 -26
16 32 1 -11.5 -16.5 -21.5 -26.5
20 29 1 -12.35 -17.35 -22.35 -27.35
25 25 1 -13.5 -18.5 -23.5 -28.5
32 20 1 -15.5 -20.5 -25.5 -30.5
40 14 1 -18.5 -23.5 -28.5 -33.5
50 9 1 -22.5 -27.5 -32.5 -37.5
63 7 1 -24.5 -29.5 -34.5 -39.5
80 5 1 -27.5 -32.5 -37.5 -42.5
100 4 1 -29.5 -34.5 -39.5 -44.5
125 4 1 -29.5 -34.5 -39.5 -44.5
CEA 2010 limits
10 38 not limited -10 -15 -20 -25
12.5 38 not limited -10 -15 -20 -25
16 38 not limited -10 -15 -20 -25
20 38 not limited -10 -15 -20 -25
25 38 not limited -10 -15 -20 -25
32 38 not limited -10 -15 -20 -25
40 38 not limited -10 -15 -20 -25
50 38 not limited -10 -15 -20 -25
63 38 not limited -10 -15 -20 -25
80 38 not limited -10 -15 -20 -25
100 38 not limited -10 -15 -20 -25
125 38 not limited -10 -15 -20 -25

Those are the engineered limits at Xmax and thermal limit, yes. You dont have to like it or agree with it, but one thing it is not is subjective.

 

[Harbottle Audio]

More sounds like you have no particular idea of how things work and use some different subjective impressions at different times to somehow compare.....good luck with that.

He's referencing my work. LDLC is an engineered limit both thermally and in compression of the driver and the amp, dsp that drives it as well as the enclosure that reinforces it.

 

[Chrispy]

He's referencing my work. LDLC is an engineered limit both thermally and in compression of the driver and the amp, dsp that drives it as well as the enclosure that reinforces it.

Please expand on this software approach then....

 

[terryforsythe]

Cost?

I too was curious. This is from the website:

 

[Chrispy]

I too was curious. This is from the website:

View attachment 430665

For that much for that sized sub, would expect a lot of personal intregration to make much difference....but so far it is obscured in mystery

 

[Harbottle Audio]

Please expand on this software approach then....

Speaker System Efficiency: What the industry isn't telling you. Harbottle Audio Ltd

Speaker system efficiency, often overlooked or obscured by industry jargon, is a straightforward concept that anyone can grasp. It's a measure of how effectively a system converts electrical power into usable sound output.

www.harbottleaudio.com

Affect and Effect: How Do Speakers Work? A Phat Physics Paper. Harbottle Audio Ltd

The balance of power within a speaker. Find out how a speaker works.

www.harbottleaudio.com

The Quest for the Best Subwoofer: Efficiency = The Ultimate Bass Experience Harbottle Audio Ltd

Amidst the quest for the perfect bass, there exists a peculiar truth: Bass being everywhere is not just a matter of cosmic coincidence but a delightful dance of efficiency. Yes, you heard it right. That ground-shaking, making it hard to breathe, then kicking you in the chest bass isn't just a...

www.harbottleaudio.com

Here are a few articles I wrote. Honestly, compression is not that big of a mystery, even Erins Audio corner has measured compression magnitude and AES75 marks it as a metric.

 

[Golfx]

Subjectivity has a place. We can't help but employ it, every single day of our lives. I employ it to enjoy my audio system, and I see that you employ it to enjoy your audio system. I'm glad that you enjoy your audio system. I'm sure that you're proud of it.
But ... subjective impressions given to other people with no data are, at best, ambiguous. More commonly, they are misleading, since subjectivity has no factor of reproducibility.
( https://en.wikipedia.org/wiki/Reproducibility )

For reviews like that, there are dozens (or even hundreds) of YouTube sites and several subjectivist publications.

ASR tries to do better, as shown by this video.

That video came from here. And the reason controls are needed is answered here.

Well thanks for the lessons in why ASR and Amir are different—I’ve been a supporter and member for awhile and enjoy the predictability of using math to help me narrow my potential purchases.

But in support of Harbottle/Funk, where that math/measurements fail is in judging expensive high-quality subwoofers. Measurements do not exist for comparative “qualitative” comparisons.

Below is from James Larson the principal reviewer at audioholics who is the last remaining standard reviewer still using CEA2010 ground measurements. It says it best. I have two Perlisten D215s but wanted to add ULF to my room. I decided to purchase Harbottle from all my research to augment my low distortion Perlistens. It has succeeded in spades with at least a 7hz measured by my calibrator Jeff Mery who blended the Harbottle with my D215s using the Trinnov’s active speaker summation technique.