• WANTED: Happy members who like to discuss audio and other topics related to our interest. Desire to learn and share knowledge of science required as is 20 years of participation in forums (not all true). Come here to have fun, be ready to be teased and not take online life too seriously. We now measure and review equipment for free! Click here for details.

AXPONA: Linkwitz,MiniDSP,Fostex,MarkAudio,Morel,Scan-Speak,SB Acoustics,SEES

amirm

Founder/Admin
Staff Member
CFO (Chief Fun Officer)
Joined
Feb 13, 2016
Messages
19,542
Likes
20,642
Location
Seattle Area
#1
093A3458.jpg


I think this room wins the award for most brands represented! My focus was the Linkwitz although I didn't see anything new, nor was the man here when I was there.
093A3460.jpg


093A3461.jpg

093A3459.jpg


I asked the gentleman if there was any worries about the larger driver firing up and getting reflections/comb filtering from the other horizontal driver. His answer was that Linkwitz had designed this and by definition then that would not be a problem.
 

Purité Audio

Major Contributor
Industry Insider
Barrowmaster
Joined
Feb 29, 2016
Messages
3,142
Likes
972
Location
London
#2
I believe Linkwitz includes the MiniDSP crossover filters with his DIY designs, which you then just load into your MiniDSP processor.
 

dallasjustice

Major Contributor
Joined
Feb 28, 2016
Messages
1,269
Likes
717
Location
Dallas, Texas
#4
And you aren't satisfied with that answer.

View attachment 1257

I think this room wins the award for most brands represented! My focus was the Linkwitz although I didn't see anything new, nor was the man here when I was there.
View attachment 1258

View attachment 1259
View attachment 1260

I asked the gentleman if there was any worries about the larger driver firing up and getting reflections/comb filtering from the other horizontal driver. His answer was that Linkwitz had designed this and by definition then that would not be a problem.
 

AJ Soundfield

Major Contributor
Joined
Mar 17, 2016
Messages
1,001
Likes
58
Location
Tampa FL
#5
I believe Linkwitz includes the MiniDSP crossover filters with his DIY designs, which you then just load into your MiniDSP processor.
Yep, in this case the upward woofer is LR2 below 700hz. Which is nearly 20 inches. The obstruction above looks around 4" round. I wonder what happens when a nearly 20" wave meets a round 4" obstruction....

cheers,

AJ
 

amirm

Founder/Admin
Staff Member
CFO (Chief Fun Officer)
Joined
Feb 13, 2016
Messages
19,542
Likes
20,642
Location
Seattle Area
#8
Don't trust your ears?
Both of them? No. I am right handed so my right ear tells me more of the truth. The left one is a bastard liar half the time.

How did it sound?
Speaker at the end of a large PVC tube.

Next!
 

Thomas savage

Power hungry desperado
Moderator
The Watchman
Patreon Donor
Joined
Feb 24, 2016
Messages
6,884
Likes
3,915
Location
uk, taunton
#10
View attachment 1257

I think this room wins the award for most brands represented! My focus was the Linkwitz although I didn't see anything new, nor was the man here when I was there.
View attachment 1258

View attachment 1259
View attachment 1260

I asked the gentleman if there was any worries about the larger driver firing up and getting reflections/comb filtering from the other horizontal driver. His answer was that Linkwitz had designed this and by definition then that would not be a problem.
The guy in the photo is giving amir... ' that look' :D

startled and abject confusion, mix with ' who hell are you' ( polite version:D)

Standard fare for amir at audio events by the looks of it:D so much so he no longer even notices it any more:eek:

I would of loved to be there for that, I want to see this effect you have on folks first hand one day amir:)

I think the tubes are from ' plumbing supplies direct' God bless them!
 

Purité Audio

Major Contributor
Industry Insider
Barrowmaster
Joined
Feb 29, 2016
Messages
3,142
Likes
972
Location
London
#11
Was Axpona busy Amir, I heard that CES attendance was down, Munich appears to go from strength to strength in terms of exhibitors at least.
Keith.
 

amirm

Founder/Admin
Staff Member
CFO (Chief Fun Officer)
Joined
Feb 13, 2016
Messages
19,542
Likes
20,642
Location
Seattle Area
#12
Was Axpona busy Amir, I heard that CES attendance was down, Munich appears to go from strength to strength in terms of exhibitors at least.
Keith.
I had not been to previous AXPONA so I don't know. By way of reference, there were less people than at RMAF and CES.
 

amirm

Founder/Admin
Staff Member
CFO (Chief Fun Officer)
Joined
Feb 13, 2016
Messages
19,542
Likes
20,642
Location
Seattle Area
#13
The guy in the photo is giving amir... ' that look' :D

startled and abject confusion, mix with ' who hell are you' ( polite version:D)

Standard fare for amir at audio events by the looks of it:D so much so he no longer even notices it any more:eek:

I would of loved to be there for that, I want to see this effect you have on folks first hand one day amir:)

I think the tubes are from ' plumbing supplies direct' God bless them!
Hey, that was before I even open my mouth! I took that picture as I was walking in and he gave me that look. The "look" continued during the conversation and hence one of the reasons I did not hang around there long.
 

Thomas savage

Power hungry desperado
Moderator
The Watchman
Patreon Donor
Joined
Feb 24, 2016
Messages
6,884
Likes
3,915
Location
uk, taunton
#14
Hey, that was before I even open my mouth! I took that picture as I was walking in and he gave me that look. The "look" continued during the conversation and hence one of the reasons I did not hang around there long.
Well amir these guys are taught how to identify trouble makers just by the sound of their foot steps... And your defiantly on ' that ' list :D

Another benefit of having ' golden ears ' ... You can hear amir coming from a mile off :D

Your about as welcome as a loud fart at the Sunday diner table but you keep on going to these events....

That's why your my hero :)
 
Last edited:

Mivera

Major Contributor
Joined
Mar 4, 2016
Messages
2,322
Likes
58
Location
West Kelowna
#15
Well amir these guys are taught how to identify trouble makers just by the sound of their foot steps... And your defiantly on ' that ' list :D

Another benefit of having ' golden ears ' ... You can hear amir coming from a mile off :D

Your about as welcome as a loud fart at the Sunday diner table but you keep on going to these events....

That's why your my hero :)

Nothing beats Sunday roast :) Speaking of which since it's Sunday, I think I'm gonna go buy one. Thanks for the idea!
 

TitaniumTroy

Active Member
Joined
Mar 22, 2016
Messages
126
Likes
12
Location
South Bend/Mishawaka IN
#16
I would have liked to have heard the larger speaker, otherwise I'm with Amir. Nor sure what a speaker at the end of a tube is supposed to sound like but I would assume it would be like what I heard there.
 

amirm

Founder/Admin
Staff Member
CFO (Chief Fun Officer)
Joined
Feb 13, 2016
Messages
19,542
Likes
20,642
Location
Seattle Area
#18
i see these stupid comments every year on linkwitz designs.
first of all, read the documentation:
http://linkwitzlab.com/LXmini/Design.htm

1. get a grasp of woofer size, directivity and wavelenght. (if you can understand the relationship)
2. then look at the crossover freequency and phase.
First, welcome to the forum. :)

Second, we are here to have fun and learn. So please don't take my show reports too religiously.

On the second part, this is indeed a teaching moment. Please use it to explain he is saying. I looked at the page (thanks for that) and I am puzzled. For example he has these two graphs:



This is front and rear with respect to what point of view? If it the front one is the horizontal frequency response with respect to listening position, the directivity index is quite poor. The 90 degree reflections hitting the side wall are not correlated well with the direct (0 degree) response. Actually the on-axis response doesn't look good either.

He also comments on the doppler effect I mentioned: "The radiating surfaces of woofer and fullrange are at right angle to each other so frequency-modulation (Doppler) distortion is very low, unlike that of a coaxial driver arrangement. " It may be the dummy in my but I don't understand how having it at 90 degrees make the doppler effect low in such close proximity.

Anyway I let you explain it to us.
 

Similar threads

Top Bottom