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Old 7th April 2004, 10:05 PM   #1
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Join Date: Dec 2002
Location: Mexico
Default high sensitivity 2way

Hi... I am looking into high efficiency Midbass/woofer drivers for a 2way or a MTM/TMM/2.5 way (as to increase efficiency)

I will be driving them with a par of Zen V4 (in the making) running them bridged.

Some of the drivers I have as options:

- Vifa P21WO-20 8" Fs 28Hz SPL 91dB
- Peerless 850490 HDS 8" Fs 30Hz SPL 91.2dB
- Peerless 850136 CSX 8" Fs 28Hz SPL 89.5dB
- Audax HP210G0 8" 6ohm Fs 32Hz SPL 92dB

Any comments on these drivers and suggestions on others that I have surelly overlooked are apreciated.

As far as enclosure type and dimensions, I am leaning towards closed baffle or proted enclosure, due to simplicity of construction.

Thanks everyone!
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Old 7th April 2004, 10:18 PM   #2
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Have you considered the option of using horns?
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Old 7th April 2004, 10:24 PM   #3
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without horns 89.5dB speakers will not get high senitivity.

Have a look at this thread: recommendation for ZEN compatible speakers


else i suggest a J Low: http://www.passdiy.com/speakers.htm

I made this: http://www.diyaudio.com/forums/showt...681#post264681
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Old 7th April 2004, 10:25 PM   #4
sreten is offline sreten  United Kingdom
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Bridged amplifiers into 4 ohms, are you sure ?

given an TM is likely 8 ohm, TMM/MTM 4 ohm.

All high efficiency drivers are better ported.

I'd go with the latest Audax, HM210Z12.

The GO is no longer available except from Maplins in the UK.
(Mexico might be quite different)

For bridged checkout the KLS9 hifi-world design, uses the GO.
Enclosure volume here is near maximum, smaller designs are
easily possible, e.g. ~ 40litres with port retuning.

sreten.
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Old 7th April 2004, 10:54 PM   #5
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Default fast replies!!!

One thing I forgot to mention in my previous post is that I want to spend between 200 and 300 dlls on the drivers. (inc. tweeters)


casull:

Yes, I have considered horns, but I want to keep construction simple if possible.... I am willing to give them a try if horns is the way to go


Till:

Thanks,... I will take a look at those links


Sreten:

"Bridged amplifiers into 4 ohms, are you sure ?" .... NO, ...is there a problem?

" I'd go with the latest Audax, HM210Z12.

The GO is no longer available except from Maplins in the UK.
(Mexico might be quite different)"

I was thinking in getting the GO at partsexpress.... I will take a look at HM210Z12



Thanks.... keep them comming!
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Old 8th April 2004, 08:36 AM   #6
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Location: Indiana
Default High Efficiency

For new stuff, have a look at B&C, Selenium, Fostex and Eminence.

Used, check JBL, Aletc, Klipsch and Electrovoice. Goodman and Tannoy also.

The simple two-way with an Altec woofer and 802/902 driver with horn is quite common.

Another great combo to my mind is using an Altec 414 12" in a 112 liter ported box with a Heil ribbon. Planet 10 posted here in another thread about the Heil ribbon.

Many just build a simple rear horn and load it with a Fostex full range driver. The plans are on Madisound's Fostex page.
Though limited at either end of the spectrum, they can be very nice through the mids. Probably the cheapest alternative if you can build your own box.
Otherwise, a Fostex on an open baffle with a bass unit under may provide the needed bass requirement and works well as a simple 2-way.

Tim
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Old 8th April 2004, 08:46 AM   #7
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what i want to try is a 604 duplex, if i find one. http://www.retroaudio.ru/speakers/Altec%20604-8G.shtml
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Old 8th April 2004, 09:01 AM   #8
sreten is offline sreten  United Kingdom
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Sorry I was getting confused about the various Audax 8" drivers.

The Audax HP210G0 is available from PE at a very good price.

The KLS9 uses the HM210ZO, which has been replaced by
the HM210Z12, and is becoming hard to find, but Zalytron
are still selling it.

Simply put 4 ohm bridged is the same as loading each channel
with 2 ohm, 8ohm bridged is the same as loading each channel
with 4 ohms. For 4 ohm bridged you very good drive into 2 ohms.

sreten.
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Old 8th April 2004, 09:23 AM   #9
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You should take a look at the Pi Speakers offerings. Both bass reflex with HF horn and high eff woofer and full cornerhorns are available, in either completed or kit form with sensitivities very near or at 100db 1w/1m (meeting your high sensitivity requirement).

Prices at http://www.pispeakers.com/Prices.htm

You get everything with the kit inclulding crossovers and cabinet plans or horn plans depending on what model you look at.

They are all 2-way's using high sensitivity professional woofers with 1" or 2" HF radial horns/compression drivers.

A full corner horn kit using 15" woofer and 1" HF horn @ 101db 1w/1m is $240 is one example there.

Go to the Pi Speakers Forum and post there if you want to know more about these speakers.

Adrian

BTW: Before anyone jumps in, I'm not selling Pi Speakers myself or advirtising for them I am just suggesting a high efficiency option which satisifies the original posters criteria and wanted price range of $200-$300.
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Old 16th April 2004, 12:03 AM   #10
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Ok.... after some silence and some browsing... I am leaning towards the 8" Audax GO... but, still not sure. I took a look at those PI speakers and they do seem hi efficiency.... Has anyone heard them? or have any coments on them?

Also I am willing to consider some proven and well documented design... sugestions anyone?

One more thing.... Streten pointed out that it wouldn`t be a good Idea bridged amps into 4ohm speakers.. (MTM) ... but how about if they are conected in series, if I use the Audax which is 6ohms it would be a 12 ohm speaker...... Sreten? anyone else?

Thanks for the help.... I apreciate it.


..... almost forgot, my computer is a Mac running with OSX .... does anybody know of a simulation software like WinSID that I can use on a Mac?
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