2x fullrange in parallel

[XT8510]

Hi Guys!

Just wondering if any of you has any experience using 2 fullrange units in parallel?
So 2 speakers per enclosure both mounted on the front.

Are there any advantages or disadvantages that you can point out?

thanks!

[Bas Horneman]

I'm not good at speaker science. But I think the main advantage is less cone excursion for a certain volume. Therefore less distortion. More efficient.

Disadvantages? Less homogenous soundstage? Not sure..my advice is to just try it.

[Scottmoose]

You'd have to either roll one off circa 1Khz or run bipolar, unless you're thinking of 2" or 3" drivers. Larger driver sizes, if both are mounted on the front panel (or wherever) will put the centre of the cones, which reproduce the treble too far apart resulting in lobing -the bane of badly designed line-arrays.

Best
Scott

[DIAR]

Here's a fine example:

Zu Definition
2*10" + super tweeter (+4*10" bass drivers)

http://www.zucable.com/definition/index.html

Specs:
http://www.zucable.com/definition/specifications.html

Review:
http://www.6moons.com/audioreviews/zu2/definition.html

[Scottmoose]

Hmm, impressive. I'd like to know how they've succeeded in eliminating the lobing problems inevitable with running 2, 10" full-range units, full-range. Line arrays need their mids and tweeters packed tightly together for just this reason. That could be a trick worth knowing.

Scott

[Kensai]

Those Zu260 drivers look like just what I've been looking for. Assuming one could talk Zu into selling a pair raw, what do you think . . . $500 . . . $1000 a pair? I'm cheap though, so for those prices, I should get "wonderful" right out of the box, without having to make any sawdust.

Kensai

[adason]

hi XT8510

to answer your question

Just wondering if any of you has any experience using 2 fullrange units in parallel?

i have used two full ranges on open baffle, lowthers dx3, however, i made it real true open baffle, with one pointing to the front, one to the back, so there is exactly the same information radiated both directions, offcourse wired in oposite polarity to be in phase, in this case, you not only have higher power handling, less excursion, but most importantly, you have only one point source, the other benefit is that it needs less equalization in this arangement, the other benefit is less distortion, since distortion of one cone is eliminated with distiortion of the other (oposite polarity), its similar like cone to cone arragement in isobaric....

anyway, see my page for more details
ed

[XT8510]

Thanks for all the info!

I was thinking of using 2 Fostex FE103E in a TL or BLH enclosure.
To see if I can get a little more bass from these small drivers.

Don't get me wrong I mean the driver is pretty impressive when mounted in a good enclsure but I am thinking of finding a way to get even better performance out of them.

Or if any of you have even better driver suggestions,

[adason]

don't want to disappoint you XT, but you will never achieve real bass out of full range drivers no matter what....no TL goes that deep, no matter how big the BLH, its just magnification what is not there at first place

besides, overdriving the full range with low frequencies just muddies the midrange and increases the distortion

if you want great sound and great bass out of full range, go basszilla way...
http://www.blackdahlia.com/html/tip_45.html

or zu looks interesting too....

i myself found tweeter unnecassary with lowthers

good luck!

[Scottmoose]

Clearly you've never heard my Terry Cain inspired BIB TQWTs with Fostex FF165Ks in them. Depends on what you call 'real bass' of course, but with an F3 circa 30Hz in-room, and a usable 25Hz, that's fine as far as I'm concerned. These things thunder. And I have no complaints about the midrange either. That's the best (if not the most amazing, as that sort of bass from a 6 1/2" driver is rare) bit abut them. Like liquid, and not exacly lacking in detail either.

Cheers
Scott