Can you show me?
Incompetent Internet Reviewers - Responses
- Thread starter Holmz
- Start date
Yes, I agree. if you completely filled the speaker with sand you could probably block it furtherbut that would spoil the box tuning/compresion.. Did you see the impedance responses after he filled the speaker with more stuffing?
I saw them. Impedance peaks are reduced and bass response is shelved. Not good sign as passive speaker.. but reduced the distortion.
If the magnet - frame resonance is the main reason, how about adding damping sheet on the frame or adding pressure on the back(magnet). To be pressed by hard stuff when assmble the woofer.
we have already looked at various options along these lines
First picture is it.
To compare I uploaded PR response too.
But 97 to 85dB is more important.
It is not 3~4dB diffrence.
Sample A 85dB distortion level similar Selah’s 97dB.
Is it randomable distortion that we just should accept?
Its not what I asked for.
we need to see the measurement at 1m from the front of the speaker for both sample A and B.
yep, see my point about power
the baffle step is wrong. If corrected twice as much power is required to achieve the same output. Thios will make the Purezza distort more. Remember crossovers also distort.
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I can only find 1M measurement of Sample A before modification. Sorry.
But 1m measurment and PR NF measurement of Sample A are similar enough.
If the distortion occured from the back, it can ba leaked by tweeter unsealed gap, and PR diaphragm.
....mmmmm.......
The nearfield PR measurements are not relevant and very easily made different by very small changes in distance to the microphone and its position.
No, sorry you are just speculating. Its meaningless.
So what are you saying? That there is not a simple on front axis direct comparison between the two speaker samples?
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Other measurment datas uploaded from him are after modification.
Before modi, I don’t have it.
Right, so you cannot actually demonstrate that there ever was a significant difference between the two speaker samples before he starting messing around with them?
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Yeah I can’t demonstrate that, but significant higher distortion at sample A was still exist..
Did it?
Show me the measurements to prove it.
Show me a simple, on front axis, direct comparison between the two speaker samples
I said it WAS exist. Look that Sample A data. Almost 1% at 400% at 85dB. It isn't designed feature, is it?
Measuring now is meaningless because he lowered the distortion.
Can you guess why that sample only have higher distortion? You said it would be modified sample, But I know it is not.
Several times I asked you, is it randomable?
I'm just saying what I know.
And this is 96dB data. Also 2nd HD is not problem while Sample A has problem at 85dB at the same level of distortion 2nd, 3rd both.We dont hide the issue, its shown in the measurements on the product page We show -46db / 0.5%
However we agreed with Purifi a better way to mitigate this issue. It can be improved further, but Im not going to discuss how
I think that sample's distortion is not from the magnet - frame resonance distortion.
Jason, with respect you havent shown any appropriate measurements that demonstrate what you claim.
Whats going on at the PR is irrelevant and the nearfield measurements can be highly variable with very small changes in microphone distance and position.
You dont listen at the PR, you listen in the far field. You need to show a pair of directly comparable measurements from the front axis of speaker A and speaker B. Preferably at a distance of at least 1.5 times the longest baffle dimension.
Why dont you have this, why was this not done? Its really basic stuff.
I dont make guesses, I work with data. I dont know what you guys did or did not do, however I do know the reviewer lied about the speaker wiring. The allegedly missing speaker mount is also totally infeasible. The bolt would have just fallen out.
So excuse me if I have little faith in what I am being told. I am quite confident the speaker was messed with, opened, bolts tightened etc. Just look at the other crazy things the reviewer tried. I really hope for the customers sake he didnt damage the tweeter.
If this amateur reviewer comes out attacking industry professionals he had better make sure he has a damn water tight case.
I dont wish to be rude but this nonsense has caused me a lot of trouble over the past few days. So far all I see is incompetent amateurs.
The problem was caused by the reviewer dismantling and in his ignarance damaging the set up of the speaker.
He is now trying to save face by attacking us.
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Holmz
Member
I believe that to affect the system, one needs a stiffer spring to raise the resonant frequency.
So it needs a thicker/stiffer basket, or a some other mechanism to either lower the excursion, which generally also raises the resonant frequency.
(But it possibly could lower the amplitude at the front, which what we generally want to have happen.)
I believe that it is not totally out of the question that shipping vibrations would be way more than years sitting in a room.
There is also humidity and temperature, and wood sweeling and shrinking that could affect how the driver is couple to the front of the box.
So it could be random with “god knows what” (GKW) the shippers are doing”, and GKW is happening with the wood in the between assembly and where it ends up. Even in some harsh climates, it is common to run humidifiers in the winter to prevent the wood in older homes cracking.
So a bit of shipping and a bit of wood movement could add together if one was unlucky… But that is totally a guess at what might be possible.
There is probably more possibilities, but I can only think to an elementary level.
Holmz
Member
Well I do not want to guess at motivations, and a few people have left (yourself included), so maybe you’re right.
I generally try to only talk positively, or be silent…. So:
Erin appears to make it a bit tough not to like him…. hence it seems like there is a disconnect between my perception and some forum owners.
Yep, no problem. We are overwhelmed with orders at the moment, but Im sure I can find time to chat
Just have R.C. go ahead and start step 1, as I left the plank of Myrtle leaning outside of his office back in Feb.
I also picked up an Octo DAC8 Pro and an RME ADI Pro, and a new (used) preamp… so between that, and work, I am slow enough to not worry about manufacturing being currently overwhelmed.
(My current speakers are 38 years old in Sept… so they will almost certainly last
)