tuossa mukavaa tietoa asiasta kiinnostuneille.... tekniikkaa
Larsen 8 and 9, 2½-way floorstanding loud-speakers that are not really 2½-way the way you would think…
Robert E. Greene
“Free-space box speakers are omni in the bass but switch to essentially half-space directivity at what is called the “baffle step” frequency, where the wavelength of the sound gets down to something along the lines of the width of the speaker. This involves a change of directivity of an emphatic sort—from omni to half-space radiation. With the popular narrow-front floorstanders of today, this transition occurs somewhere from 500–1000Hz, an unfortunate location for an abrupt change in radiation pattern. People seems to have decided to ignore this or at best to make the transition as gradual as possible, but this does not make it cease to exist."
A traditional loudspeaker placed in the room away from surfaces like the back and side walls will exhibit this baffle step drop in SPL (Sound Pressure Level) at 500-1000 Hz. The drop is theoretically 6dB. The way to cope with this in such a speaker is to control the radiated SPL in the crossover in such a way that you attenuate the sound above the baffle step frequency to match the SPL below..
This essentially lowers the sensitivity and output SPL of the loudspeaker.
One other way of addressing the problem is to add one more driver connected in parallel with the first bass driver and a crossover design that gradually lets this extra driver fill in the missing 6 dB. Drivers connected in parallel will draw twice the power from the amplifier in this region. A 2½-way system.
The actual change of directivity is still there in both cases even when it is masked by the change in output SPL to make it not obvious…
All Larsen loudspeakers are free of this baffle step because of the wall placement.
The close proximity to the back wall essentially makes it equal to having the driver mounted in the wall with an infinite baffle, hence no “baffle width” that has a corresponding baffle step drop frequency.
So why is there Larsen 2 ½-way speakers and how do they work?
The history behind this is that “someone” in the Larsen design team was using his Larsen 6 together with a potent array of subwoofers and this “someone” asked Anders Ericsson if he could make a bigger Larsen with “more” bass. A speaker with a high-quality power response in the lower frequency regions even at really high SPL.
The Larsen 6 has a linear frequency response down to well below 30 Hz! But if you start to play really loud there will be a compression of the response below let’s say 80 Hz compared to subwoofers with 12” drivers.
Anders got back to the drawing board together with John and the result was almost a surprise to us all…
The new Larsen 8 was not a Larsen 6 with a subwoofer… It was so much more!
It had rich, deep and precise bass with very low distortion all the way down to below 25 Hz.
A very natural sounding body in the bass region.
So if the Larsen Loudspeaker provide half-space directivity already in the bass and no baffle step how is the 2 ½-way idea implemented and what does it do?
In the Larsen 8 (as well as the Larsen 9) the main drivers are located at the top of the speaker is diagonally mounted directed upwards and inwards the same way as in the Larsen 6. Located at the floor on the side of the loudspeaker there is a second driver identical to the main one.
There is no need to design the crossover for this driver to match the non-existing baffle step from a specific baffle width / frequency.
Instead the crossover point is set around 300 Hz.
The reason for this frequency is to minimize the loudspeakers (all loudspeakers) problem with the reflex from the floor in between the loudspeaker and the listener. If it would be only to address compression and distortion it would probably be fine with a 100 Hz or so crossover frequency.
In a traditional loudspeaker the extra woofer would add the missing 6 dB of SPL by both drivers playing the same sound (in that frequency range) twice as loud together.
In the Larsen 8 (and 9) the drivers instead share the work load, both drivers playing half the SPL each.
The benefits are lower distortion (half the cone movement for same loudspeaker SPL), more uniform bass in the room due to double the points of radiation of sound, better coupling to the air while radiating bass sound due to twice the cone area, suppression of reflex from the floor.
All together creating the signature natural sounding rich, deep bass found in the Larsen 8 and 9.
Larsen hifi sivuilla lisää samankaltaista löydettävissä...
Sustainable Sound Design from Larsen Hifi
It is not an exaggeration to assert that people more and more are striving to incorporate sustainable solutions in their homes. We think this trend is good. The fact that people think more about quality to keep things for long goes well in hand with our philosophy for sustainable sound design.
What do we mean by Sustainable Sound design?
We are true to our origin: The ortho acoustics. Stig Carlsson’s Ortho Acoustic principles are still our guideline and rule in the design. We know that keeping faithful to these principles, the sound we get is so good that we don´t need to change models. Instead, we improve. The best evidence we have for that is the fact that for six years in a row, Larsen 8 has been awarded with Editors Choice Award from one of the world leading hifi magazine The Absolute Sound. But our other models have also been awarded and so far, the record list looks like this:
Larsen 6: Editor’s choice 2018, 2019, 2020 and 2021
Larsen 8: Editor’s choice 2015, 2016, 2017, 2018, 2019, 2020 and 2021
Larsen 9: Editor’s choice 2021 and furthermore THE GOLDEN EAR AWARD 2020
Being sustainable, we also try to have our production and subcontractors as local as possible to minimize our environmental footprint and always continue to make things better and listen to our subcontractors when they have things to tell us and new units to offer.
With the ortho acoustics design, we are different from other high-end speakers, and some sales arguments are probably the selling point we can offer you as a distributor or reseller. Let´s take the most important.
The placement of our speakers is FLUSH AGAINST THE WALL, but away from the corners! No compromise! Just place them with no toe in, plug them and play. This placement to be placed against the rear wall, or at least not more than an inch or two away from the wall, is part of the ortho acoustics principle and a significant trademark for all Larsen speakers. It is part of the sound design and all to avoid early reflexes. On this point, Larsen speakers are among the very few speakers that compromise friendly to the one who care both for the home furnishing as for the good sound. Many reviewers have figured out that with Larsen speakers you get the ability to reproduce the sound from the concert hall in a normal living room.
Flush against the wall Larsen Hifi
The sound stage
Many have been surprised when they listen to a pair of Larsen speakers for the first time. The reason is that the sound is far bigger than their size will suggest, and the sound stage is surprisingly well defined.
When you have put the speakers against the rear wall and about a half meter from the sidewall, you can move each speaker sideways, and listen, until you think you have the right sound for your room. Just remember to have the right-sided triangle in mind when you figure out the distance between the speakers. That’s it! Out of the speakers, you get a big airily sound composed of direct sound and the reflexes from boundaries and furniture in the room. A total stereo sound fills the room thanks to the angled drivers in the top. You will feel the depth in the music without sitting in the exact hot spot! You can sit nearly anywhere in front of the speakers, and you will get a lovely sound stage. Just like live music.
Reclaim your living room as listening room
When Stig Carlsson developed the first ortho acoustic speakers he had no special lab. No, he used his own living room. When “the troika” of Anders Eriksson, Stefan Björklund and John Larsen developed the Larsen serial they did the same but in John’s living room. They had one purpose in mind: To use the same method as Stig Carlsson but in their own way in their own living room. The foundation was made and this is what you will hear today when you listen to a pair of Larsen. They are made for the normal living room and for the whole family. No refurnish needed! Not made for any special music! Just play and enjoy!
Yes, we are different! No "baffle step"!
No doubt about that we are different! Normal front-firing speakers placed at a distance to the back wall will exhibit what is called a “baffle step” at a certain frequency determined by the width of the speakers' baffle. At this “baffle step” the radiation from the loudspeaker changes from half sphere to omnidirectional with the consequence of a 3-6 dB drop in Sound Pressure Level (SPL) for frequencies below “the step”.
This step, however, is nothing that exists in real-life acoustics nor in the Larsen speakers. The reason is that the wall placement provides half-space directivity already in the bass.
Here within is one of the secrets to the lifelike authentic sound of the Larsen speakers.
We are proud to be different. And we are proud to be the company bringing the Carlsson OA principles to new generations of listeners.