Mar-Kel70 in Sweden

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#822
That is correct the twin Mar-Kel 70. I also have some regular EL70s stashed in case I really like them and decide to build something else using them. Sadly, if I love the twin Mar-Kel70 it will only serve to taunt me as they won't be mine.
As a side note, they aren't fun to assemble, and the braces have made me hate holesaw bits. Thankfully, forstner bits and a drill press can solve everything it seems.
 
#825
In all honesty, a saw tooth forstner bit makes it extremely easy to cut the holes in the braces compared to a hole saw, especially with the harder birch ply. It makes one huge mess when dealing with large holes, but aside from the mess and the fact that you can't touch the bit after doing a dozen holes in rapid succession, its pretty easy to do.

Rullknufs, on the topic of using birch ply, I wonder if more bass and impact can be had from using birch ply instead of your extremely thin particleboard. And I keep thinking that if you like the EL70 so much and wish for more bass instead of a different speaker, why not consider building stands for your speaker out of nice plywood and putting a woofer in them and going with a FAST build like what Dave has pointed out before.
After that you can build new plywood cabinets for the Mar-Kel70, since that would probably give you everything that you currently like with that extra assistance for the bottom end which seems to be the one area that you really would like to improve upon.
 
#826
Lerg said:
Rullknufs, on the topic of using birch ply, I wonder if more bass and impact can be had from using birch ply instead of your extremely thin particleboard. And I keep thinking that if you like the EL70 so much and wish for more bass instead of a different speaker, why not consider building stands for your speaker out of nice plywood and putting a woofer in them and going with a FAST build like what Dave has pointed out before.
After that you can build new plywood cabinets for the Mar-Kel70, since that would probably give you everything that you currently like with that extra assistance for the bottom end which seems to be the one area that you really would like to improve upon.
Click to expand...

Yes, that's a good idea. But the size of the wall is limited, i'm not sure that i would be able to fit an equipment rack, two stands and two woofers.
I was planning on the Peerless 830884 woofer, and crossing over at 145Hz which Bjorno recommended. But wouldn't that mean that i'd need to have the woofers close to the EL70 and at ear-height?
 
#827
Rullknufs said:
Yes, that's a good idea. But the size of the wall is limited, i'm not sure that i would be able to fit an equipment rack, two stands and two woofers.
I was planning on the Peerless 830884 woofer, and crossing over at 145Hz which Bjorno recommended. But wouldn't that mean that i'd need to have the woofers close to the EL70 and at ear-height?
Click to expand...


Close would be good, but woofers XO'd that low certainly wouldn't need to be at ear height - note the location of drivers in bases that Dave has posted frequently. This eventually led to the configuration used in the Tysen "FAST" enclosure - drivers were mounted higher in cabinet, but the XO was 333 HZ -
 
#828
chrisb said:
Close would be good, but woofers XO'd that low certainly wouldn't need to be at ear height - note the location of drivers in bases that Dave has posted frequently. This eventually led to the configuration used in the Tysen "FAST" enclosure - drivers were mounted higher in cabinet, but the XO was 333 HZ -
Click to expand...

Okay.

But the woofer and EL70 should be on the same vertical line, right? Then i'd have to make a stand out of the boxes for the woofers. And i guess i need to have the woofers front-firing in my room.
 
#829
Rullknufs said:
Okay.

But the woofer and EL70 should be on the same vertical line, right? Then i'd have to make a stand out of the boxes for the woofers. And i guess i need to have the woofers front-firing in my room.
Click to expand...


sorry, that wasn't clear - yes, the idea is to reduce space by making the woofers as stands for the main enclosures ( EL70 in your case)

if sufficient room is available on either side or behind of the stands (at least a foot) , the drivers wouldn't need to be front firing

as a reminder, here's a couple of photos of variations on this theme from

http://www.diyaudio.com/forums/full-range/144099-thread-tysen-variations-fast.html


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An externally hosted image should be here but it was not working when we last tested it.


Tysen, the speaker, and his namesake - getting an early start in the audio lifestyle
 
#830
chrisb said:
sorry, that wasn't clear - yes, the idea is to reduce space by making the woofers as stands for the main enclosures ( EL70 in your case)

if sufficient room is available on either side or behind of the stands (at least a foot) , the drivers wouldn't need to be front firing

as a reminder, here's a couple of photos of variations on this theme from



Tysen, the speaker, and his namesake - getting an early start in the audio lifestyle
Click to expand...

I have read a lot about the Tysen 😀

One foot, should be possible. I don't want to place the speaker too close to the corner anyways. But as i've said many times before. Will it work? I mean, one speaker will stand right next to an open door, and the other will stand in a corner. If the driviers can be mounted on the side i guess that makes it much easier making a stand of the cabinet.
 
#831
Rullknufs said:
I have read a lot about the Tysen 😀

One foot, should be possible. I don't want to place the speaker too close to the corner anyways. But as i've said many times before. Will it work? I mean, one speaker will stand right next to an open door, and the other will stand in a corner. If the driviers can be mounted on the side i guess that makes it much easier making a stand of the cabinet.
Click to expand...



will it work in the sense of giving you more output in the lower frequencies than the EL70s alone - certainly

if you're very limited for space, perhaps front firing would provide more placement flexibility in regards to side walls, etc. - if I recall the room correctly, you are rather limited for adding more boxes
 
#832
chrisb said:
will it work in the sense of giving you more output in the lower frequencies than the EL70s alone - certainly

if you're very limited for space, perhaps front firing would provide more placement flexibility in regards to side walls, etc. - if I recall the room correctly, you are rather limited for adding more boxes
Click to expand...

Well, the width of the whole setup will be limited. I don't want to place the right channel speaker too far into the corner, and the left channel speaker can't stand in the door. And i'll have to fit an equipment rack inbetween the two speakers. Having front-firing woofers will fit, although i guess it will be difficult making a stand high enough maintaining a reasonable volume of the cabinet.
 
#839
Yes. You get lobing issues with 2 drivers when the distance between them starts getting large compared to the XO frequency.

At 333 Hz a wavelength is ~40" long. At 2kHz is is under 7". Ideally the centre-to-centre driver distance is 1/4 wavelength, 1/2 wavelength you are starting to have issues.

C-C on my MTM is about 10". In the SEAS Thor it is about 11".

dave
 
#840
Streets Of London by CM Carlsson on Spotify

Playing it out loud and the Mar-Kel70 fills the whole room with the music. Sounds really really good!

Speaker plans are set on ice for the moment. Saving money for travelling instead. Spain two weeks in august. Slovenia in april. Germany, Czech Republic and South Africa in june/july next year. And if i still have money left i'll go to Shetland islands in the winter after that for Up Helly Aa 😀
 
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