[tino84]

hi,
even if NXT provides a very good sound, using them for film is not really the best.

so I decided to change from NXT to fullrange OB.

I'm searching for something low-priced, and saw these:

http://www.visaton.com/en/chassis_zubehoer/breitband/bg13p_8.html

it has good sensitivity, good response (and seen graphics, I think it would get something higher than 20000hz).

no problems with low frequencies, I yet have woofer, to cut around 200-250hz.

So I saw either visaton fr10, but due to graphics (seems to "loose" something at higher freqs), and lower sensitivity, it's not my first choice.


I think to use 2 bg13p serial (so 2 bg13p for front and center).

other possible configuration I thinked:

1 bg13p + 2fr10 serial

3 fr10

2 bg13p serial + 1fr10 (for front, center 1bg13 and 2 fr10)

I don't know if using different drivers would be a good think, so I'm thinking the best choice would be 2 bg13p and stop.

what do you think about? any advice? is there something I haven't considered?

thanks to all

PS: at the beginning, I considered also fountek fe85 and fostex fe83e, but I left them due to low power handling, about the same of NXT

[Rudolf]

no problems with low frequencies, I yet have woofer, to cut around 200-250hz.

what do you think about? any advice? is there something I haven't considered?

What is keeping you from a crossover at 400-500 Hz? Are the woofers so bad? Both the BG 13 and the FR 10 loose efficiency rapidly below 400-500 Hz.

[tino84]

What is keeping you from a crossover at 400-500 Hz?

nothing  , I can even cut at 400-500hz

[Rudolf]

I suppose that you are on a very small budget. Otherwise it would make no sense to work with such low-cost drivers. If I am right, you probably don't want to spend too much money on crossover and notch filter parts.

I could make some simulations for those OBs. Could you tell us some more about those woofers? TSP? Do you intend to "box" them or should they be OB too? Is the project fully passive or do you plan separate amps for every driver?

[tino84]

budget is about around 130€ for drivers.

I have yet crossover ( behringer cx 2310), and woofers are monacor carpower sp-302c, yet in OB.

do you think would be better to use more priced drivers?

[Rudolf]

budget is about around 130€ for drivers.
I have yet crossover ( behringer cx 2310), and woofers are monacor carpower sp-302c, yet in OB.
do you think would be better to use more priced drivers?

Whizzer cones don't cut it IMHO. I would much prefer a 13 cm midrange driver with a dome tweeter on top or at least some 3" Vifa/Peerless drivers with their dustcaps working as tweeter domes.

Apart from that you can try the BG13P in an OB of 100x30cm, with the driver center at 90 cm height and 10 cm from the inner baffle edge. High pass would be 2 mH and 82 µF. Possibly you don't need a notch filter, if listening 10-20° off axis.

BTW: What does "I think to use 2 bg13p serial (so 2 bg13p for front and center)" mean? Were you considering to use two BG13P in series?

Rudolf

[tino84]

ok, so you think something like these would be better? (just to have an idea)

http://www.toutlehautparleur.com/tangband/tangband-w3871b-p-4413.html

my panel is yet ready, about 115x50cm. why do you think I'll need a high pass filter (instead of my electronic crossover?)

And yes, I was considering two bg13p in series  because of ohm (16ohm) and to get more db, were I thinkin wrong? 

PS: so, what do you think about this

http://www.electricalmate.co.uk/proddetail.php?prod=100940

or markaudio chr? (but remember monacor is cheeper..)

[tino84]

so, after many troubles with internet providers, I'm back.

I have to ask Rudolf, why do you think using 2 AP in series would not be a good choice?

and also, I want to build also a little central speaker, with bg13p, have I to use 1 ap, or shall I use 2, to increase db?

thank you a lot

[Rudolf]

I have to ask Rudolf, why do you think using 2 AP in series would not be a good choice?

What is 2 AP? 

[tino84]

sorry, it's the same as speaker (so 2 ap = 2 bg13p)

[Rudolf]

I have to ask Rudolf, why do you think using 2 AP in series would not be a good choice?

Have you looked at this post http://www.audiocircle.com/index.php?topic=46951.msg517958#msg517958 and the follow-ups? At least I would recommend to turn one speaker backwards - in order to avoid two whizzer cones at the front.

[jonnoshore]

Tino,

Thanks for the link to the carpower stuff, interesting... The 302 looks interesting...

Especially as it lead me to this, which looks like an interesting Open Baffle 15 driver for someone with the budget...

Carpower RAPTOR-15MK2 15" 1500W Car Audio Subwoofer
http://www.bluearan.co.uk/index.php?id=MON100220&browsemode=manufacturer

[tino84]

hi, 302c I'm using is very good and cheap, it performs deep bass, I like it.

happy to know you find those woofer interesting 

[tino84]

speakers bought!

6x visaton bg13p and (2 front and 1 center)
2x visaton whc 30.

so I think I will use 1 bg front and 1 backwards.

whc will enforce bass, with carpower 302c (or maybe, I'll cut woofer separately, maybe 400hz and 150-180hz).

now, design.

would be better something like these:

http://www.tnt-audio.com/casse/prophecy_horns.html

or something like these:

http://www.audiocircle.com/index.php?topic=105447.msg1080570#msg1080570

I have 3 panels to use (2 are 1115x50x1,5 and 1 is 90x50x2 cm )

(I started with idea to use and mount panel about one on the other.)
any idea/help?

thanks a lot

[tino84]

visaton bg13p mounted!

they sound pretty good, very clear, very good highs (as shown in graphics).

then I cut carpower sp-302c to 450/500hz and visaton whc30 to 200hz, also those woofer it's a good choice.

[tino84]

3 months and many tries later, here I have my new OB with Visaton bg13p.

I searched to reach the more bass I can, with an eye focused to the minimum size.

so, I used a panel 50x100cm ca, and 2 side panels, 1 50x75 and the other 40x75. another little piece ( 30x40) is mounted at side of Visaton.

with this configuration, ft would be 85hz
344/85/2/1.41=1,4

so, one woofer is set to 200hz and the monacor at the bottom, at 80hz. (I think I would reach easily 40hz)

when closed, the system is only 33cm deep.

http://i45.tinypic.com/23rth1f.png

http://i45.tinypic.com/2eklqau.jpg

http://i45.tinypic.com/fnznt5.jpg

(it miss only a little panel on the top, to make an U-frame even for visaton bg ).

(I'm thinkin also to make another extension on sides, 2 panel of 20cm for side, that would increase ft to 55hz. when open, imagine sides making an L )

http://i50.tinypic.com/208k03o.jpg

http://i49.tinypic.com/2197uo6.jpg

[tino84]

speaker re-invented.

one woofer cut to 180hz and the other to 60hz.

sides are 1/6 of the front, so 50 ¹/₆ = 8cm ca. bass comes easily 

fullrange Visaton can also rotate to match best listening point