Oct 19, 2008  Fostex FE167E Bass Reflex Speakers. The very first pair of speakers I put together some thirty-eight years ago was a pair of single-driver loudspeakers using 8” Kaltro twin cone drivers. As I type this, I find myself once again listening to speakers using a single full-range driver. This time it is the 6.5” Fostex FE167E fullrange driver. May 13, 2016  Fostex P1000E speakers with FE103En 4' full-range drivers. #Fostex #FE103En & 純正バックロード ♪ Yuka.S guitarist. How to get the Best Sound from a Full-Range Driver.

Hi pcutter1,What do you mean when you refer to a 'wide (useable in a room)response'. Is it errant HF that needs tempering in your opinion or more extracting sufficient bass?I've been reading a little on Audio Nirvana's range of drivers and the hurdles/obstacles involved. It seems (to me) the jury is still out on these. Some are more than happy with bottom end reproduction, others constantly fiddling with cabinet design/size extremes. TBH all I've read praise highly the reproduction of the mid range and beyond, so much so that it is becoming increasingly difficult to ignore, but those most satisfied appear to be have incorporated a dedicated LF box with a 12' - 15' driver.

ATM this is not an option here, but it could become possible down the track.I also have some reservations of larger drivers 'overpowering' a smallish listening space. I think satisfactory low end requires the use of large driver area, this is a separate issue from how the mid and top are handled, reproducing the fundamental bass note at 40Hz is difficult for 6 and 8 inch drivers to achieve, it is a matter of cone area and displacement.

12 and 15 inch drivers are good for low frequency extension in all systems, that benefit is not limited to systems having direct radiator mid and top.In smaller listening spaces the room standing waves occur higher in frequency which can lead to muddiness it is true unfortunately. Consider using some cut-only EQ to pull down some of the resonant peaks. Either you use a full range speaker or it isn't, once you add in a sub then you may as well go to a 2 or 3 way. Integrating a sub into a system is something that needs great care.The time worn problems with a single driver are that in the HF the sound becomes focussed into a beam so that listening off axis becomes more difficult, the higher the frequency the narrower the beam.

It is for this reason that full range drivers are usually either small (Jordan) or mid sized with a cone shaped whizzer to aid HF dispersion.The full range ELS panels I use are about 6ft (2m) tall with the transducer panel itself taking up most of that, and 1ft (30cm) wide, these are widely acknowledged to have beaming problems at the extreme HF, the manufacturers have developed an accessory aimed at reducing this effect. The ELS panels I used previously were the same make but were about 4ft tall and 3ft wide, the width consisting of 2 vertically hinged side panels attached to a central post which carried the electronics. This allowed the panels to be adjusted so that the beaming didn't occur. Nicer sound but domestically a no-no.The equivalent would be to use 2 full range drivers set into a curved or shallow V shaped front baffle, this would still be full range.Traditionally many horn and folded horn speaker designs utilised full range drivers, many used Fostex units. These designs also had drawbacks apart from the basic large sizes of the cabinets needed.Problems also arise in terms of the LF, as stated above, the need for a transducer with a large surface area produces problems, a 10' cone cannot reach the same HF that an 8' or a 6' can, but a 6' cone cannot reach down to deep bass.

The larger the cone the more difficult it is to control as it is heavier and more resonant (far from pistonic), they can suffer from impedance anomalies more readily. The problem can be sidestepped by using multiple smaller cones.I have also used Hybrid ELS speakers, one pair with 10' woofers and very large curved panels, the other pair with 61/2' woofers and 1ft wide curved panels.

They were both well reviewed in terms of integration between the cones and panels, a difficult task to accomplish but the ease with which the 10' woofer reached LF was very apparent when making a comparison. It's physics.I have found that a 15' sub woofer sounds the best, integrated with a crossover point below 100hz. A 12' cone needs to crossover to high to achieve integration very easily.One last point about full range drivers is that they perform as point sources, which are an acquired taste. Thank you both for your replies.At present I am limited by the constraints of the room and by other furnishings but I have been able to establish a reasonably good listening position despite these hurdles. Pcutter1 wrote:Looking on their site, there isn't much pre-order information. Do you know what size Cabinet they recommend? Are you making them up yourself or getting someone else to do it for you?If you have a look on page about half-way down is a table with cabinet size / speaker recommendations.

The plans for construction are made available to you upon purchase.In my case I'll be trialling a few rough and ready knock ups in a few variations to see what suits best, but I'll leave final construction to a mate to do for me. In our younger days both of us had reputations for turning out some reasonable joints:lol: though he has since gone on to master the kind that you see above:wink:A 2' sandstone baffle in a heavily braced 1' ply construction is the current plan for the final build.cheers. Now with more listening time under the belt the overall 'change' in the sound between the Audio Nirvana units and the previous set of Mission's is far less striking.

My ears I guess are becoming accustomed to the sound produced by the 10' AN's much more and I'm very happy to say the least. These full range units produce a very naturally balanced sound which is most noticeable in the lower frequency range when comparing with conventional crossover based units. Gone is the sense of any artificial boominess for want of a better descriptive term, replaced with what I can only describe as a much cleaner sounding note even lower down than I've been used to. The mids and highs too are incredibly smooth, rich and detailed also.

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Thanks spittenkittens,Before I started this project I thought I'd need to experiment with cabinet shape and size to extract decent sound. Materials chosen being another factor.

But it's testament to the design of these drivers that someone like myself can build 'a box' to put these in and still they sound magnificent, short of applying a few basic principles with regard to port tuning.I wanted heavy floor-standers and I estimate these run close to 200lbs each given the double layered MDF construction. And yes you're correct: there's a sense of satisfaction in doing things yourself and experimenting with a few ideas.If you're ever inclined I recommend at least listening to a full range driver before contemplating building your own. Unfortunately in my case I couldn't try before I bought. Add to this the shipping charges to Australia and you are at least fortunate that you are in the US should you wish to pursue a build of such.Anyway, thank you for your comments and here is a pic of what is currently putting the smile on my face:D.

Another set of DIY full-range speakers! The small fellows in the picture are a pair of 23L driver and built with MDF. Many thanks go out to Mark from who did most of the woodworking.

The wife pleaser in the middle is an experiment of his. A 20' subwoofer in an open baffle! The test setup was a Luxman preamp, Behringer DCX and Luxman power amp.

Cross over points between 80 and 120Hz were tested with 90-100Hz working well with the 20' open baffle sub. It was tough trying to place the speakers as we found the 20' sub was often in the way of the music, but we did manage to get it set up nicely.

We were very pleased with the initial results and are expecting even better performance with a tube amp.Overall, I am very pleased with the results from this very simple project. More information about this project and an enclosure plan is available on the page.Related DIY Audio Projects:. Alex's build of the.What's Playing: Marc Almond & Softcell - Say Hello, Wave Goodbye.