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Multi-Way Conventional loudspeakers with crossovers

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Old 13th March 2009, 10:08 PM   #31
Helmuth is offline Helmuth  Netherlands
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I have another option for you. Very special driver for about 75euro

2X sph315 in one box = 2x 28cm with ferro fluid in airgap
130liter BR
97dB 1W/mtr
-3dB 45Hz
-10db 33HZ

Click the image to open in full size.
Click the image to open in full size.

sph315
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Old 13th March 2009, 10:52 PM   #32
45 is offline 45  Italy
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Audiodesign your requests about the 15" woofer are simply impossible to satisfy. It is just about the laws of physics!

You are basically making a quite big mistake judging the linearity and quality of the speaker only by the on-axis frequency response.

You should look a least at the 30-45 degree off-axis response and the waterfall (CSD) and would see that none of those woofers is suitable for 3-4 KHz crossover.
Also you can see all those small peaks and dips along the impedance curve from 500Hz and above: each peak is a clear sign of break-up.

You really need to go for a 3-way speaker if you want an extended frequency range and real hifi reproduction.

The B&C 6MD38-8 is one of the few high efficiency midranges (96dB) with clean waterfall (very rare in high efficiency speakers) and flat frequency response up to the its first serious break-up at 5KHz. This speaker could work very well between 500Hz and 3KHz (using a series LC notch filter in parallel to the speaker and tuned at 5KHz in order to remove that resonance and make the cross-overing effective).

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Old 13th March 2009, 10:53 PM   #33
Helmuth is offline Helmuth  Netherlands
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Also a very good driver. And not expensive.

Beyma 12br70

2X12br70
175L br 95dB 1W/mtr
-3dB 40Hz
-10dB 26Hz

100euro

Click the image to open in full size.
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Old 13th March 2009, 11:18 PM   #34
Helmuth is offline Helmuth  Netherlands
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4x sph275 carbon cone in each box

98dB 1W/mtr

-3dB 50Hz






2X dayton audio SD315-88, 50 euro a pice.

Click the image to open in full size.

dayton project
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Old 14th March 2009, 01:02 AM   #35
tinitus is offline tinitus  Europe
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Quote:
Originally posted by Helmuth
I have another option for you. Very special driver for about 75euro

2X sph315 in one box = 2x 28cm with ferro fluid in airgap
130liter BR
97dB 1W/mtr
-3dB 45Hz
-10db 33HZ

Click the image to open in full size.
Click the image to open in full size.

sph315

If you look closer you will see that its down at 90db around 500hz, and then up again
So above 500hz its just useless
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Old 14th March 2009, 02:12 AM   #36
Pano is online now Pano  United States
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Quote:
Originally posted by audiodesign
A 18" cannot arrive to 800-1KHz
LOL! You haven't heard the P.Audio stuff, then.
(hint, look at the Blue Monster Series)
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Old 14th March 2009, 07:48 AM   #37
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I would like to esclude parallel connection because I want an easy to drive loudspeakers with inpedance near to 8 ohm to the driven with any 2A3 or 300b amplifier.

Using a parallel connection of 2 x 12BR70 we can get a solution but the impedance will go near 2-3 ohm with the filter.

I am interested to a 15" to get a 35-3KHz linear frequency band but the filter will be positioned near to 800-1KHz
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Old 14th March 2009, 07:57 AM   #38
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This seen to be the best: W15N8-350

only 100 lt to get a 47Hz at -3db and on-axe flat until 4KHz

I cannot find someone to buy this in Italy, incredible

Have you a good source for these ?
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Old 14th March 2009, 08:23 AM   #39
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or this: SP-15A/402PA

100 lt to get 50Hz at -3b and on-aze linear until 4KHz

I have seen some offert about 155 euro each for these
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Old 14th March 2009, 09:37 AM   #40
Helmuth is offline Helmuth  Netherlands
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Quote:
Originally posted by tinitus



If you look closer you will see that its down at 90db around 500hz, and then up again
So above 500hz its just useless
That is true tinitus only when you consider your room acoustics you know that a flat response is nice but will be disturbed by reflexions.

So I think this is a very flat response for a 94dB 1W/mtr speaker. And I ask my self if the response is the same in the box and with the balffle. Than can the dip can be gone or a raise some where else can occur.

So don't go blind on the graphic alone.
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