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Old 2nd April 2012, 03:01 AM   #21
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Quote:
Originally Posted by brsanko View Post
....I've gotten excellent bass from Fostex FE206Es which aren't much bigger than the103s..
???? The FE206E is an 8" class driver with SD of 206 cm^2 while the fe103E is a 4" class driver with an SD of 50 cm^2

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Old 2nd April 2012, 07:56 AM   #22
Jameslc is offline Jameslc  Australia
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Originally Posted by brsanko View Post
Maximum power is almost irrelivant. It's probably something like 5-10 watts, but that doesn't mean it won't kick you in the chest and pop your ears. 1 watt of actual acoustic energy is enough to blow your ear drums. I think what you really want to know is how loud will it play. It's tough to say. The above comment makes it sound a bit worse than it really is. I've gotten excellent bass from Fostex FE206Es which aren't much bigger than the103s. A few things to consider; how big is your bedroom? Would you be better served with large towers or smaller ones and a sub? How complex of a cabinet are you willing to make?
I imagine the high mounted mouth was for two reasons. One being that's where the end of the line ended up being, and two to minimize imaging problem associated with mid frequencies coming out of the mouth. Damping materials (not "dampening") greatly reduce midrange through the mouth but also reduce bass.
well i sort of jumped the gun by building the towers in the video, I've only built 1 enclosure so might test the one in my room to see how it goes before building the next one, i am hoping on dumb luck that they will sound like they do in the video
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Old 2nd April 2012, 08:38 AM   #23
brsanko is offline brsanko  United States
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Sorry I meant FE126E.
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Old 2nd April 2012, 11:59 AM   #24
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When you say got excellent bass from an Fe126E, how low, and in what type of enclosure? And how big was the enclosure (volume)?
Was it capable of the deep sound from the original video?
I don't have any experience with any Fostex, it may be easy to do it (the deep sound), but the reasons are not clear, it's too low for any driver especially for one with such a low Qts.
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Old 2nd April 2012, 04:09 PM   #25
chrisb is offline chrisb  Canada
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Quote:
Originally Posted by brsanko View Post
Sorry I meant FE126E.
Quote:
Originally Posted by krakatoa View Post
When you say got excellent bass from an Fe126E, how low, and in what type of enclosure?
let me surmise that if unsupported by woofers, it would likely be some type of BL horn - manifold, or even as simple as a BIB folded Voigt pipe.

there are many styles

Quote:

And how big was the enclosure (volume)?
if a BLH, the typical concept of "enclosure volume" is not quite as applicable as path-length and overall dimensions

Quote:
Was it capable of the deep sound from the original video?
I don't have any experience with any Fostex, it may be easy to do it (the deep sound), but the reasons are not clear, it's too low for any driver especially for one with such a low Qts.
I'd opine it's borderline / subjective whether the FE126 would deliver sufficient impact / weight in the low frequencies in any of the "horn family" for your particular needs, but would be more confident that the FE103E could not.
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Old 2nd April 2012, 09:52 PM   #26
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chisb you may have missed some of the posts in the thread, we are trying to establish the recipe for a TL with a 4 inch fullranger (in this case the Fe103en) that will play down to the 41-48 Hz region and make it in a convincing manner, like in the video from the original first post (My Other Listening Room - YouTube).
Jameslc will make an attempt based on estimations of the sizes done by me studying the video. I have made some experimentation with different enclosures and drivers but none had enough bass for all sorts of reasons; you need a suitable driver that can do the job and you need to use every advantage you can - larger enclosure, best placement for room gain, and I tend to believe that the mouth should be closer to the floor to gain a little more spl. The lowers the Fs the better, the larger the Xmax the better.
My concern with the volume was related to the overall size of the enclosure considering that it's for a smaller room (just trying to keep it small), and to compare with the original ~23liter estimation.
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Old 3rd April 2012, 05:17 AM   #27
brsanko is offline brsanko  United States
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Low 40s at high SPLs seems a bit ambitious. I think I was probably getting high 40s to low 50s in the bedroom when I moved them to the living room I could still get that low at moderate volume but as a rocker and a movie buff moderate volume doesn't cut it, so a sub was needed. In a moderate sized horn cabinet (frugelhorn etc) acoustic music can sound very good and the mid bass doesn't seem lacking but nothing low and thunderous.
Oh and btw low qts is a good thing when it comes to bass horns, high qts means a larger cabinet, and FS has almost no effect on bandwidth. The most important number to look at for getting low bass in a horn or TL is xmax.
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Old 3rd April 2012, 05:21 AM   #28
brsanko is offline brsanko  United States
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I must digress though and add that when the FE206E was tuned much higher (70-80hz) the midrange and upper bass frequencies were much cleaner and more dynamic. You will get much better results doing this and adding a small tapped horn subwoofer for the lows IMHO.
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Old 3rd April 2012, 10:58 AM   #29
Jameslc is offline Jameslc  Australia
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Finally got my FE103en today and i started to cut the hole for it to put in my finished transmission line and all i can say is wow! the bass in this enclosure is great (for a little driver anyway) but the only thing that is a bit annoying is it misses out some pieces of music but it doesn't seem to be a particular sound for example it would the piano in one piece and a bit of a bass guitar in another i don't know it might just be me or because i am only running 1 speaker on stereo
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Old 3rd April 2012, 12:53 PM   #30
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WOW! You actually build it!
What's the tuning frequency, internal volume, height of the driver?
What was your first impression, the first few tens of seconds?
Are you satisfied with the bass output in strength and depth?

Oh and by the way! run the original audio from the video and compare it with headphones of subwoofer in the same room to see if something is missing.

For the other thing - change the stereo channel and play the song again to see if that was the problem. Secondly the frequency response should be full of peaks and nulls, most problematic should be the null between 150-200 hz, predicted by simulations (any straight TL with no driver offset has one). Can you hear it?
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