Locally sourced power 
Monday, December 9, 2019, 20:01
Posted by Anders
I figured I needed to try out the labgruppen LAB1600 since I have read positive comments about their sonic performance in various forums, both international and domestic, hopefully I can get my hands on two more since they should also be a good match for the ROAR15's if running them bridged amounting to ~1,6kW/driver (FTC 8 Ohm).

LAB1600 on the far left.

Initial low level listening confirms this, as a top amp (>150Hz) it sounds very good indeed, clean, detailed and controlled, and as sub amp it keeps this signature and tightened thing up significantly, more definition and punch to put it bluntly.

In my search for the LAB1660's I had the good fortune of running into another very interesting model from from labgruppen, the LAB1500, this is a rather rare model, I have yet to find any documentation online for it and have requested it from labgruppen.

The LAB1500 is a proper old school beast where 2/3 of the amp is made up of it's power supply with one of the biggest transformers I have seen to date in an amplifier, everything is arranged very neat and tidy, looks hand built, I which I could listen to it but it trips my 10A breakers when I so much as look at it (a fix for this is on the way, i hope) :)
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busy times 
Sunday, December 1, 2019, 18:39
Posted by Anders
I write this from our new home in Kungsbacka (which also happen to be the hometown of lab.gruppen) with the latest addition to the family, my now 5 days old son, i a crib beside me, so it has been busy times but of course there is already a work in progress listening room, it's all about priorities...

Now that there are no wall to wall neighbors to worry about I can stretch the legs a bit and listen at "proper" levels, the kids do not seem to mind, so now I'm looking at getting some new amplifiers, not for SPL reasons as much as sheer curiosity.

Four Lab.Gruppen LAB1600 in good condition would be nice, currently looking around for these, two bridged driving the ROAR15's, one for mid and one for high (some future project teasing), but there are other amplifier candidates as well.

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Monday, March 4, 2019, 12:31
Posted by Anders
Johannes dropped by the other day to have a listen to the ROAR15's, fortunate for me he also brought along a laptop with REW and a Umic.

These measurements where take a in room, so don't stare yourself blind at the results.

Appreture ROAR15:

Distortion ROAR15:

Complete system, bare in mind that this is a room completely devoid of any form of acoustic treatment.

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just investigating some claims... 
Thursday, February 14, 2019, 21:34
Posted by Anders
I just wanted to understand if I can see the similarity between a ROAR design, simplified description (2. below), and a claim made that it is similar to what is popularly referenced as a "bass cannon", the closest reference to this I could find is the Bose wave canon, see simplified description (3.) below.

I'm sorry to say I cant really see the similarities between them, but it should be said that I may have gotten something wrong here in the case of the bass canon reference, and I'm willing to change my mind if a sufficient explanation should arise.

For reference I also put in a traditional Tapped Pipe (1.) in order to try and explain how this forms one part of the ROAR design, I also attempted to describe the bose acoustimass cannon (4.), what I believe to be a Helmholtz coupled version of (3.)

Again, I may very well be wrong here, it's just a fun exercise, not a thesis, so no claims from my side as to the validity of this :)
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ROAR15 at home 
Thursday, October 25, 2018, 16:54
Posted by Anders
Just a quick post of what is going on :)

RTA low level pink noise at the mouth LPF 500Hz (no additional signal processing):

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