Project May, similar privat project?

[Flodstroem]

Hello again

Wander if there is anything preventing me to use the project "May" as a starting point/platform for may own new speaker project?

I have planed to build some TL speaker, but when looking at, and reading about those interesting May-speakers, I have decided to try to build a similar speaker cabinets for my own pleasure (Ok, for my family to be honest). I dont now if there is some restrictions involved in this original project May, but you guys at the Lansing Heritage Forum must guide me if there is any.

My intention is to build a speaker same as the project May cabinets but not fitted with same type of speaker components, I shall use what I have in stock.
Regards

[Zilch]

1) Premature. Wait for the project to be completed; the design is not final yet.

2) The Project May design is specific to the particular components used. Other components will not necessarily "translate," and probably not well.

3) Better approach is to detail your component set here and let the "Committee" guide you toward a similar design consistent with your objectives....

[Flodstroem]

1) Premature. Wait for the project to be completed; the design is not final yet.

2) The Project May design is specific to the particular components used. Other components will not necessarily "translate," and probably not well.

3) Better approach is to detail your component set here and let the "Committee" guide you toward a design....

Thanks Zilch for your answer. My intention from the beginning was to built a TL-speaker (Transmission Line) , eg, two TL-speaker in one cabinet: one TL for the low bass(18-80 Hz, 2245H or 2215H) and one TL for the "high" bass (75-1200 Hz, 2012H). Also these cabinets should be equipped with midrange 2440/2380A (fitted with 2445 diaphragm) and the 2405 on top.

I have been calculating those TL speaker for a while now by Martin King´s TL calculating sheets and was in the mood to start building them now (after several test boxes listen to). But those TL-speaker will be very large and the concept "project May" looks very attractive to me with respect to physical format including the fact I have listen to a pair of K2S 5800, and I liked the tight and fast dynamic response of that speaker model.

My idea for this "May" like design is to try to build a very similar system but try to use the components that was intended for my TL design. I dont know if this is possible due to I was going to use active x-overs (4-way operation)

If building a "May"-like product I would like to use same concept as the originals except for the components: 2 frequencies for bass, one for midrange and one for highs. Lower cabinets for the 2245H and upper cabinets for the 2215H, alternatively, the 2215H in lower and 2012H in upper cabinets. But,,,,,,,,,,,,,,this will be a decision based on what you guys ev. will be recommending me to do?
regards,

[Zilch]

You're talking "MTM."

http://audioheritage.org/vbulletin/s...ead.php?t=4157

KICK his ass for deleting the pics....

[Flodstroem]

You're talking "MTM."

http://audioheritage.org/vbulletin/s...ead.php?t=4157

KICK his ass for deleting the pics....

Yes i´m talking "MTM", but not with similar speaker for bottom and top cabinets/boxes. Im talking of a lower bass at the bottom and a slightly higher at the top. 2445 in the middle also the 2405. One big difference would be the cabinet. Planning to build the lower cabinet to reach further up to the upper half cabinet and the 2445/2405 will be integrated in this box (for to get enough volume to the 2245H (or 2215H), and low enough f3 point. (18-20Hz) as in my TL speaker. 2215H/or 2012H would then be mounted in a rather small box because the low frequency f3 point will be as high as 80 to 90 Hz. It only requires a small box for the 80 to 1200 Hz response.
My TL calculating has yield a straight frequency response between 85 and 1200 Hz. Maybe I shall use this box for my design?
Ok, I would like to hear some comments to a project like this. Nothing has been done practical for this project, only for my TL projekt.
Regards

[Robh3606]

If you want to go with an MTM why not go with a couple of 10's or 12's with the horn/2405 between them?? The 12's should work if you want to keep the 2245 down low say about 100Hz. Just a thought.

Rob

http://www.harman-japan.co.jp/produc...ome/s5800.html

[Flodstroem]

If you want to go with an MTM why not go with a couple of 10's or 12's with the horn/2405 between them?? The 12's should work if you want to keep the 2245 down low say about 100Hz. Just a thought.

Rob

Rob,
Maybe I better should use two 2215H for each cabinet (2 x 15") exactly as in the project May, but then use the 2445 and 2405 in between those two woofers. How would you estimate this project idea if comparing it with May?

Also, do I gain any benefits or drawbacks if skipping the 2245H´s in this construction?

Regards

[Robh3606]

Hello Flodstroem

You are going to be covering many of the same issues we discussed with Project May. We looked at it as a system that could be set-up to be flexible as far as the final configuration. There is a distinct advantage in going active as it makes system changes easier.

What kind of bass extension are you looking for?? If you want the most low end bang for your buck I would consider 2234's and look into the 2 1/2 way approached used in the 4435 and Everest. This will give you the flexabillity of a set up that could be used as an MTM with similar low end performance to a pair of LE-15's or a 4435 base for your horn section. That 2234 woofer pair is a well founded proven design so you know that works and you already have the passive filter worked out for you. You could try Le-15's as the range is similar but you would have to look into cabinet size and tunings to see if you get a pair to work as well as the 2234's work. The Le-15's don't have the X-Max of the 2234's so you have to see how they look used this way.

Back to cabinet size, setting up 15's in an MTM gives you a large enclosures by default. The 2245 needs big box to go low. If you have the room fine but you may be able to get the lowend your looking for without it depending on which drivers you choose. LE-15 may take a larger box compared to the 2234's so you need to look at this as well.

Project May's set-up is modular with 2 woofer and one horn cabinet. If you want to use your 15's full range you stack as an MTM. Using it as a 2 1/2 way you stack the woofer boxes horn on top. This way you can try both and decide which you like better or just switch from time to time. Better get help doing the stacking . Send Mr. Widget a PM he did most of the testing and will be able to help you.

Get a pair or 2435's off Ebay while they are still $200 a pop and put them asside. Sooner of later a suitable horn will show up or you can use a PT in the mean time. That will give you a Beo based compression driver that is the same as the 435 less aguaplas.

Rob

[Flodstroem]

Thanks Rod for your interesting and challenging answer

I had to confess that size has no special priority than bass extension (but with project May I would probably re-consider it) .
I would like to inform you that my first project chosen was a TL projekt and there I would have a bass extension down to ca 22-23 Hz (=f3) Looking at your calculated sheets in this thread I can se f3 will be as high as 40-45 Hz. This is not acceptable for me unless this calculation only was meant as a comparison between 2234H and the 2215H (LE-15A?)?

Im aware of the x-max at the 2215, but in an TL this is not a problem due to the extremely low excursion at the f3 point (22-23Hz) , smaller than the frequencies above f3.

But the physical format of the May speaker looks very attractive to me and this construction is similar physically if compared to my TL design (with only one 2215H, or 2245H for each cabinet). Also, the May speaker are nearly exactly as high as would mine be when finished (1.5 meter). The TL speaker was planned to be built with active, 4 way x-over. But its not a problem using the active x-over concept on a May design I guess?

The (or my) benefit for to choose the May concept lays in the smaller cabinet dimension. Those speaker will better integrates in my audio/music room.

Your suggestion for to use the 2234 (a 2235 without the mass-ring installed I guess?) is interestingly, but is this due to some similarity to the 1500Al or of any other reason?

The idea of a modular speaker system has its benefits but for low bass, I dont know this is beneficially compared to one big box, whats yours thoughts about that?

Only reason (-s) for to build a May speaker lays in the physical formats, modular concept and a more practical speaker if looking at the possibility to move it around in the room/house if one must. It could be a challenging project to build because of its high technical status (also popularity). Also one could probably calculate for a higher second hand value if for some reason going to sell this speaker in the future compared to an even bigger TL speaker, I only guess here.

Regards