microTower bipolar ML-TL for CHR-70 or EL70

[leeoh]

Originally Posted by planet10

Yes,

The EL70 was the 1st driver Mark did with the tech that also gives the extended HF seen in the Alpair7 and Alpair12.

dave

Dave. Thanks again for your help.

[Kepeli]

I build up 5.1 system around 5 CSS el70's. Main channels are BIB's, center- and back-channels are microtowers. With good subwoofer Price/quality ratio is great, specially in my case when I have separate set for music (2-channel listening.)

[kristleifur]

Interesting speaker, certainly. So how much amplifier power is needed for an EL70 implementation? (And what is the efficiency of those drivers anyway?)

[planet10]

I would recommend 10-20 watts minimum. Depends on levels required & room size. I have 20 w on mine at the moment, when Chris uses them, his big amp is 7w (my room is big, his is small)

http://p10hifi.net/planet10/CSS/EL70...ata-080909.pdf

dave

[kristleifur]

Originally Posted by planet10

I would recommend 10-20 watts minimum. Depends on levels required & room size. I have 20 w on mine at the moment, when Chris uses them, his big amp is 7w (my room is big, his is small)

http://homepage.mac.com/planet10/CSS...ata-080909.pdf

dave

Thanks! Good info.

What would you say the efficiency is of the speaker overall? Calculations, measurements, or guesstimates - doesn't matter.

[planet10]

Efficiency is going to be whatever the driver is midband, assuming one has no need for any BSC. So ~86 dB. Sensitivity (given a voltage mode amp) will be 3 dB more.

dave

[Jesbull]

Originally Posted by planet10

Something like the attached is what we did....

dave

I understand that the driver need to set on the brace but not too much... If by mistake I oversanded the brace, what do you propose to fill in the gap?

Thanks,

[planet10]

Originally Posted by Jesbull

I understand that the driver need to set on the brace but not too much... If by mistake I oversanded the brace, what do you propose to fill in the gap?

Depends how much gap... a thickness of paper (or a few), or some non-corrigated cardboard. In the case where we are trying to accomodate 2 different drivers, a small block of wood for the driver with the shalloest depth.

dave

[leeoh]

Dave. I know that I am getting off the main subject of these posts, but can't think where else to pose this question :- What is a reasonable alternative to ply for enclosure building? Where I live, decent ply is EXPENSIVE . It costs about four times what particle board costs, which really makes me think twice about trying some of the designs for the CSS EL70's. I accept that particle board is inferior to ply (MDF seems to be even less acceptable), but if the big difference in material cost means not making anything, then that is a shame. There must be many of us who are frightened off by ply costs, so what could we use in lieu? Double thickness of half inch particle board? 18mm particle board face on one side with three ply? Maybe Scottmoose could add his views?

[planet10]

MDF or partical board speakers are better than no speakers at all. Many people are ignoring the recommendation for ply and using MDF and are still enjoying their loudpeakers.

The alternatives to ply are all essentially, make your own ply.

6mm particle board + 6 mm HDF laminated inside and out with plastic laminate
6 layers of 1/8" MDF
particle board laminated inside & out with a layer of fiberglass mat.

that sort of thing. The plywood is probably "cheap" in comparison

dave