Possible budget line array driver?

[mpmarino]

Here is a ebay link

I happen to have dealt with this ebay seller. He is local to me and a pretty good guy. Take a look at these drivers. I remember him saying some time ago that he has thousands(?) of these cheapies. Do they look familiar in any way? Do you think they might be an option for a budget line array?

[TerryO]

The size and shape of the basket resemble the late/great Radio Shack 40-1354 speaker. The picture indicates that it doesn't have the whizzer cone that the 1354 had, and it's hard to see the size of the magnet. It may be Ok or not, without measurements it's hard to say.

I personally prefer smaller drivers and a concave baffle for a focused array, but I'm practically alone in this. If those drivers can be had cheap enough, go for it. A lot of the virtues that expensive drivers provide are of little or no concern when multiple drivers are utilized in arrays. As a matter of fact there are cheap drivers that can sound *very* good, as long as they're not stressed. You gain, depending on how you wire them, a lot of power handling and thus the ability to play these cheap speaks much louder than would be possible in a point source configuration.

If the guy has as many as he says, he should get a sample measured and post it. If they're any good he stands to sell a lot more of them.

Best Regards,
TerryO

[zobsky]

Madisound has cheap foster woofers at $3 each that I'm attempting to use in an array project.

[mpmarino]

Hmm, a google search reveals that it is a replacement part for some sort of Motorola gear.

[JinMTVT]

those looks exactly like the cheap drivers Hyundai and Mitsubishi been using in their cars in the 90's
except it was 4 ohm i believe ...but otherwise looks identical

though, almost all car drivers looks the same so ..

but 10$ for a box of em ? sure it's worth to try just for fun/experiment
i'd get 200+ of em..and try to see how dynamic 200 driver sounds

or you could try and deal him out for 1000 drivers
and make a complete wall sepearation on your room with all those drivers ( infinite baffle like )

with a door covered in drivers

[bjorno]

Possible budget line array driver?

…A lot of the virtues that expensive drivers provide are of little or no concern when multiple drivers are utilized in arrays. As a matter of fact there are cheap drivers that can sound *very* good, as long as they're not stressed…

I like to add: This driver could work well in a tall near field array, but if aiming at and in order to preserve the single driver built in quality, the usable bandwidth coverage for the driver ends at <= 1.3 kHz, thus including at max the upper midrange. See picture 1(2)

Besides following Jim Griffin’s papers its also a good idea to look for a 3" driver in order to increase the upper usable bandwidth just above 2 kHz and a suitable tweeter that is small enough and can be crossed over at that frequency, unless a tweeter types like Neo8 is available and crossed direct to the 5.5” driver < = 1250 Hz.

The vertical beaming from the tweeter lines in the top octave is not heard as severe as if allowed lower than about 8-10 kHz where under the directional bands rules. See picture 2(2).

My line array recommendations using (budget) drivers are as follows:

For a W–line and M-line, steep low-pass crossover at lambda/2 or > = 12 dB/ octave at lambda/4.

The M-line; max 4 “ drivers, needs a tweeter that can handle 1,5 kHz, <= 3” drivers can be used up to 2.25 kHz at max if the c-c distance allows frame touching frame.

T-line max 1,5 “ drivers and c-c if dome or of cone type and crossed over as low as possible with lowest order filter and the possible horizontal lobe tilt taken into consideration.

b

1(2)

[bjorno]

2(2)