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Old 25th March 2003, 04:38 AM   #1
TheoM is offline TheoM  United States
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Question Need driver recco for monitor design

I plan to build studio monitors. Instead of speaker stands, I thought I could build a tall skinny box (9x11x48), and use all that air to get low end. My dilemma is this: I want f3 at 35 or so in a sealed box. If I use a 3 way system I lose a lot of phase alignment in the all important 70-200 range - but if I build a 2 way, I need a driver that will go 35 to 2500 and sound fabulous.

Even if I do use a 3 way, I have not seen an 8" that will go that low in a sealed 2.5 cubic foot enclosure. I could use a 10" but that's just too much in a near-field system.

For a monitor system flat is essential, low signal compression is essential, and transient response is key - but I don't need big db. Once I have drivers I can design the box and crossover details.

Comments help sugggestions please. I'm looking for high end types of solutions only. Ted.
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Old 7th April 2003, 06:01 PM   #2
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I've chosen the Seas Excel 8" woofers and Seas 27TAFC/G tweeters, in BR enclosure though (50L @30Hz). It can be easily converted to sealed box in case there's too much low end. I'm using a waveguide with the tweeter. I'm just building the cabinets so I haven't got any ideas how it will sound (though I have another pair of speakers with quite similar construction, eg. 6.5" Seas built aluminium woofers and 25 mm aluminium tweeters in a waveguide). I guess these speakers will be quite directive overall which is good IMHO. Obviously the baffle step attenuates the low end but on the other hand the room almost fixes it. I'm going to use DSP FIR + analog 24 dB/oct Linkwitz-Riley xovers, summed before going into power ampliers, as for realtime monitoring the delay of FIR (which is half of the impulse response)is a bad thing. The DSP is actually my PC and the progam is Cubase (I'll write or use some ready available convolver VST plugin).
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Old 7th April 2003, 10:04 PM   #3
uli is offline uli  Austria
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Default Re: Need driver recco for monitor design

Quote:
Originally posted by TheoM

Comments help sugggestions please. I'm looking for high end types of solutions only. Ted.
Hi theoM,
take a look:
Tony Gee

Uli
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Old 8th April 2003, 10:16 AM   #4
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That guy makes awesome stuff. Maybe consider a 2.5 way with two 8 inch speakers. In a large low Q sealed box, the second woofer could be used to fill out the low end. Planet 10 knows a bit about these...
Why rule out vented boxes? Lots of studio monitors have vented boxes.
Look at the HiVi F8, gets great mids and deep bass. I've got a couple right in front of me. Very pleased. 2 of those in a 2.5 way configuation in a 2 to 3 ft^3 vented tower would be very nice.
we'll see...
-andy
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Old 8th April 2003, 10:47 AM   #5
Pan is offline Pan  Sweden
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Seems like a good choice would be a 2.5 or 2 way with dual 7"-8" drivers. I would take a look at the high Q versions of Accuton and Seas Excel line.

/Peter
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Old 8th April 2003, 10:53 AM   #6
uli is offline uli  Austria
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Default excel

Hi Pan,
I once tried the Excels but I couldnīt cope
with those nasty cone breakups.
IMHO especially in US the Usher delivers!

Uli
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Old 8th April 2003, 10:55 AM   #7
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Do you intend to go active or passive ?

Regards

Charles
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Old 8th April 2003, 11:17 AM   #8
Pan is offline Pan  Sweden
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uli,

did you measure the breakup point/points and designed a trap filter to EQ it?

This is a must with the Excelīs. I have only listened to the 5" ers and they sounded really good.

I read about one person (who was selling drivers and components from all premium brands) who felt that even when the break upīs was treated , the Accuton was slightly smoother and more natural sounding in the higher range.

/Peter
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Old 8th April 2003, 11:46 AM   #9
uli is offline uli  Austria
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Default my ability

Quote:
Originally posted by Pan
uli,

did you measure the breakup point/points and designed a trap filter to EQ it?
/Peter
Hi Peter,
yes I did but somehow I didnīt manage them to sound well
(subjective of course) Without the trap they sounded metallic
and with trap dull. Maybe my fault but I do not like speakers
which have such issues especially for that huge pricetag.
I long worked with the famous SS 8545. I try now to get those
Usher 7" s as they cost below 200 € for a matched(!) pair.

Uli
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Old 8th April 2003, 01:40 PM   #10
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Problem with Excel series magnesium cone (and aluminium cone) drivers is that the cone breakup is actually created at lower frequencies than the resonance frequency itself. If you look into distortion figures @ 1500 Hz (around) please note the 3rd harmonic distortion @ 4500 Hz. So you should have the crossover at max. 1500 Hz or so. I think this is independent of the size of the driver, I mean from 5" to 8" all Excels are suffering from this. It doesn't help if you just filter out the frequencies >4kHz, the cone breakup is still there at lower frequencies. So a steep (at least 24 dB/oct or more) crossover at low frequency (1000-1500 Hz) is a must.
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