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Multi-Way Conventional loudspeakers with crossovers

Choosing Scanspeak Drivers for 4-way
Choosing Scanspeak Drivers for 4-way
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Old 9th March 2018, 10:58 PM   #1
Offshore64 is offline Offshore64  United States
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Default Choosing Scanspeak Drivers for 4-way

Hi guys,
I am build a pair of 4-way towers. For a 12x20 room for classical music and jazz, some rock. They will be powered through a DSP and an 8 channel amp, individually wired. The main objective is imaging. What does one look for drivers in "matching" a 3 or 4-way speaker build? I was thinking as long as you have overlapping frequency response and similar efficiency the rest could be taken care of in digital crossover? Any ideas, info and criticisms would be appreciated. I'd hate to purchase these and realize I'd done something wrong.


The drivers I've come up with are these, on the premise that the F3 dives well into the drivers response below it:
Scanspeak Discovery 26W/4534G 10" Aluminum Cone Woofer 4 ohm


ScanSpeak 22W/4534G00 Discovery 8" Woofer 4 ohm


Scanspeak Discovery 10F/4424G, 4" Midrange 4 ohm


ScanSpeak Illuminator D3004/6020-00 Tweeter Textile Dome


Maybe a link to a previous thread?
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Old 9th March 2018, 11:46 PM   #2
boswald is offline boswald  United States
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Choosing Scanspeak Drivers for 4-way
Well, it's both easier and trickier than you would think.
Easier because the drivers don't have to match up to the point of tons of overlap, as you would want with passive.

Trickier because you do need more efficiency at the low end, as your eight channel amp has the same power for all frequency ranges. If you get a couple channels with more power, no sweat.

One thing to remember is that many multichannel amps are current-limited by heatsink and power supply issues, so maybe go 8 ohm, you should have enough sensitivity(and with dsp you won't be padding anything down & losing voltage). ScanSpeak does give you more 8 ohm choices than most.

If you want to make it easy on yourself, look at Troels' SS builds for driver combos, if they work passive, they will be great active.
Look at his 3way classics, and add your lower bass. If you want max spl, look at the driver combos in his 4ways, slightly bigger mids for more volume. If not, you really can't beat any of the 10Fs for dispersion.

Sounds like fun.

Last edited by boswald; 10th March 2018 at 12:10 AM.
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Old 10th March 2018, 06:09 AM   #3
digitalthor is offline digitalthor  Denmark
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You just have to be aware of something.
When you build a slim tower speaker, with several smaller drivers. You tend to get a wider dispersion. When you do this, you have to make sure that you do not have to many early reflections in your listening room, or else it can degrade the performance of that speaker.
Reflections in most listening rooms are the main factor of the sound we hear - so this has to be taken into account.
Earl Geddes makes speakers with constant and somewhat lower dispersion. This makes the speaker less problematic in a normal room, since the early reflection are fewer. Later reflections are not so big a problem, since the ear can filter them out as spaciousness and therefore serves as something good.
So your project can be great, as long as you try to get an even horizontal dispersion and take care of the worst early reflections in your room.
This video with Floyd E. Toole says a lot:
YouTube
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Old 10th March 2018, 07:01 AM   #4
kapelli is offline kapelli  Poland
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I would however definitely avoid Purchasing Disovery midrange. It's their basic line, and instead I would purchase SB Acoustics Satori midrange, and two 22cmm bass instead, and you should still be financially somewhere in the same region. Also check berrylium Satori tweeter, but that might be bit more expensive than Revelator.

At least for the midrange I would go for like 12 cm of much better quality (Satori, Revelator, Eton, and so on) and put two 22 bass drivers instead of 22 and 26 to save some money of woofers.

However, you have to do a cost simulation on that.
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Old 10th March 2018, 08:51 AM   #5
Lojzek is offline Lojzek  Croatia
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Quote:
Originally Posted by Offshore64 View Post
Any ideas, info and criticisms would be appreciated. I'd hate to purchase these and realize I'd done something wrong.
Hi there, take a look at Dynaudio Consequence UE and Wharfedale Airedale Classic Heritage as a matter of a principle.

A suggestion not very expensive at US$ 650 for a stereo setup.
  • Morel MDT 39=1.1" dome tweeter
  • Morel MDM 55=2" dome midrange
  • Scan Speak Classic P17WJ00=6.5" poly cone midbass
  • Scan Speak Discovery 26W/4534= 10" aluminum cone woofer
XO frequencies: 150Hz, 700 Hz, 4000 Hz
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Old 10th March 2018, 11:08 AM   #6
Offshore64 is offline Offshore64  United States
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Boswald- would the gain knob on the amp as well as the EQ of the DSP not coimpensate for this? I do need to educate myself more on the relationship between impedance and sensitivity.


Lojzek- that is weird, I was already thinking of using that hf driver, and switching the mid to the Audax 100dB. Im seriously shooting in the dark here, and assumed any $100 speaker could be MADE to work with a decent setup.



Thanks for the replies guys. Much appreciated.
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Old 10th March 2018, 01:20 PM   #7
andy2 is offline andy2  United States
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I would prefer the AirCirc tweeter over your tiny little tweeter.
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Old 10th March 2018, 01:25 PM   #8
Offshore64 is offline Offshore64  United States
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Originally Posted by andy2 View Post
I would prefer the AirCirc tweeter over your tiny little tweeter.


The Freq response looks fairly identical, can you explain why you would prefer the AirCirc? Have you heard them both?
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Old 10th March 2018, 02:58 PM   #9
ErnieM is offline ErnieM  United States
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How big can these towers be? What's your budget? The possibilities are nearly endless with a fully active setup.

Last edited by ErnieM; 10th March 2018 at 03:19 PM.
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Old 10th March 2018, 05:09 PM   #10
Lojzek is offline Lojzek  Croatia
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Quote:
Originally Posted by Offshore64 View Post
The Freq response looks fairly identical, can you explain why you would prefer the AirCirc? Have you heard them both?
There is nothing to be worried about choosing the smaller flanged D3004 over air circ. Lower sensitivity caused by a weaker magnet that increases response at Fs is of no consequence for you are going to high pass higher and it's active. SD2 motor have both of the units, fair is fair.
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