8" high efficency woofers - NEED HELP - diyAudio
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Old 27th February 2007, 07:49 AM   #1
Miha is offline Miha  Slovenia
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Exclamation 8" high efficency woofers - NEED HELP

Please help !!! Does anyone have any suggestions for 8" min 92dB woofer. It will be paired with peerless hds tweeter and audax hm130z10 mid. Current setup is hds tweeter, audax mid and peerless hds 205PPB woofer. I must say that there is very small amount of bass from this woofer. If anyone is ineterested
there is a thread on this forum :
http://www.hiendfi.com/phpBB2/viewtopic.php?t=933

Avaclone project . We are very satisfied with mid and tweeter, but as I said bass is the weakest link in this configuration.

So if you have any suggestions ...

THX in advance,

greetings,

Miha
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Old 27th February 2007, 11:35 AM   #2
sreten is offline sreten  United Kingdom
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Hmmm.......

90dB/2.83V midrange and I presume you want to use it without attenuation.

= a 94db/95dB bass driver = not going to happen.

Two bass mids each 88dB/W/8ohm in parallel would work.

In fact there is nothing wrong with the woofer choice, all it needs is
a properly designed crossover incorporating baffle step compensation.

For a 90dB/W woofer after 4-5dB BSC midrange level is 85-86dB/2.83V.
So attenuate the midrange and tweeter to match.

/sreten.
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Old 27th February 2007, 04:51 PM   #3
300Z is offline 300Z  Brazil
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How low do you need the 8" to play?
B&C 8PS21 or B&C 8NDL51, 18 Sound 8MB400, 18 Sound 8NMB420... These should be able to play into the 70-60hz range and are 94db/w.

Leo
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Old 27th February 2007, 07:24 PM   #4
ScottG is offline ScottG  United States
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Default Re: 8" high efficency woofers - NEED HELP

Quote:
Originally posted by Miha
Please help !!! Does anyone have any suggestions for 8" min 92dB woofer. It will be paired with peerless hds tweeter and audax hm130z10 mid. Current setup is hds tweeter, audax mid and peerless hds 205PPB woofer. I must say that there is very small amount of bass from this woofer. If anyone is ineterested
there is a thread on this forum :
http://www.hiendfi.com/phpBB2/viewtopic.php?t=933

Avaclone project . We are very satisfied with mid and tweeter, but as I said bass is the weakest link in this configuration.

So if you have any suggestions ...

THX in advance,

greetings,

Miha
http://www.troelsgravesen.dk/HES_II.htm

Notice the vintage vifa and the extra magnet near the bottom..

http://www.hoejttalerbutikken.dk/pro...&sub=11&page=1

with the appropriate "alignment" I think this would also serve you rather well:

http://www.rcfaudio.com/vediMacro.ph...00/product.htm

(..perhaps adding a magnet to these as well.)

then there are the supravox 215 GMF drivers - similar to the rcf but with greater eff. though much higher vas.

http://www.supravox.fr/anglais/haut_...rs/215_GMF.htm

http://www.troelsgravesen.dk/Supravox215GMF.htm
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Old 28th February 2007, 08:33 AM   #5
Miha is offline Miha  Slovenia
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THX for suggestions.

What do you think about ciare bass speaker. Especialy Ciare HW 204 or HW 203

Sreten, your suggestion is good, bot the only problem is that mid & tweeter sound fantastic without any attenuation. So I was thinking if I only add bass speaker which is more efficinet the whole thing would have more "weight".

Thx again,

greetings

Miha
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Old 28th February 2007, 09:08 AM   #6
sreten is offline sreten  United Kingdom
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Hi,

Two wrongs don't make a right.

Either actively bi-amp them and fix it that way or attenuate mid/treble.
Bothered about resistors ? use (auto)transformers then.

None of the drivers shown manage 94-95dB where it is actually needed.
Most of them have poor low bass. There is nothing wrong with the current unit.

/sreten.
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Old 28th February 2007, 09:18 AM   #7
Miha is offline Miha  Slovenia
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Quote:
Originally posted by sreten
Hi,

Two wrongs don't make a right.

Either actively bi-amp them and fix it that way or attenuate mid/treble.
Bothered about resistors ? use (auto)transformers then.

None of the drivers shown manage 94-95dB where it is actually needed.
Most of them have poor low bass. There is nothing wrong with the current unit.

/sreten.
Sreten, I`m not an expert in Xover design. Can you please explain
use of (auto) transformers in X0ver networks.

THx
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Old 28th February 2007, 09:33 AM   #8
sreten is offline sreten  United Kingdom
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Location: Brighton UK
Quote:
Originally posted by Miha


Sreten, I`m not an expert in Xover design.
Can you please explain use of (auto) transformers in X0ver networks.

THx

There is no short answer to this question. Research the LS3/5A
crossover where a tapped inductor is used instead of an L-pad.

/sreten.
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Old 28th February 2007, 01:09 PM   #9
tinitus is offline tinitus  Europe
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Silverflute 8" W20RC-38-S-08 (8ohm with shielding magnet)

It is said to be quite good, a pair of them in paralel might match your mid/tweeter

As said, a single 8" with even higher sensitivity will have even less bass

Some do even use double 10" in a setup like yours, fore real bass power

How about a 10" AudioNirvana

But its a lot of changes, and a whole different design - as recommended the easy way is to attenuate the top

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Old 28th February 2007, 01:43 PM   #10
Miha is offline Miha  Slovenia
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10" is too big for our enclosure. Baffle is 26cm wide.
First i will tray with BSC on mid & tweet (mid : 2,2 in series and 6,8 paralell - tweet 1 in series and 8,2 paralell).

I hope it,will work.

Note : tweeter on picture is not the same as we use
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