| navin |
A friend of mine has built a 9-10W SE tube amp. Now his existing speakers (Wilson Benesch Act 1) are not sensitive enough.
So I recomended he look at the Fostex 6" that are all about 94db/1W. He hos not built a speaker before and would like to know why the 168Sigma is twice the cost fo teh 1666/167 or FF165K. Is it worth the difference. He says he would like to build only one system and not have regrets later.
$170 per driver for teh 168 Sigma did not faze him. In either case he prefers to play safe and go with teh plans Fostex provides unless I can find him a plan that has been built before.
His musical tastes are 80% jazz, some vintage (60s-70s) rock and a bif of teh more well known classical scores but he likes it loud (atleast louder than I like it). He is looking at 100db across the musical spectrum.
BTW would his Velodyne 18" subs integrate well with teh Fostex? The work quite well with his Act 1. |
|
|
| hacknet |
the 168 was built for a horn loaded cabinet. it has a chunkier magnet and thus the cost. i`ve heard it before and it does sound rather good. it requires fostex propritary sound diffusers to sound good thou...
if money is no object, i`d recommend the F200A. its probably the best FR around nowadays at that price range.. |
|
|
| navin |
F200A = $400. Ouch. I think he get fazed by that. I know he did not want to pay for Lowthers. Besides it is only 90db/1W.
Lets say $150 per side is what he can afford or to be more precise $150 per side is what I would recomend he spend after all this is his first DIY system.
Also i wonder if a 8" system would be too large for his bedroom. He does have the Act 1+Velodyne for his living room.
The room is 15' x 12' x 9' high. The speakers will be kept along the 15 ' wall flanking a 32" LCD TV. He was loking at a compact speaker say 8-9" square x 36" tall so I am looking at drivers that will work in about 22-25 liters. |
|
|
| Josephjcole |
If he is sure he was going to be using it with a sub I would skip the rear loaded horn and go for the fe167 or 168e sigma in a sealed enclosure. This sould intagrate much better than a backloaded horn, or BR enclosure. Just be sure the sub sounds alright to 100hz or whatever you need to go to.
Joe |
|
|
| navin |
| No the Fostex will be run fullrange. The Velodybe will stil work with his act1 in teh living room. the fostex and 9W amp are for his bedroom. |
|
|
| Bob Brines |
This is the FR curve of an FE167E in an 40" MLTL. The nearfield/farfield splice is at 522HZ. The is not the finished product. There is no stuffing, no filters and zero break-in. Is this not pretty close to full-range?
Bob |
|
|
| navin |
| sure is! how big is the box. you said 40" MLTL that means the box is 40" tall. what are the width and depth? |
|
|
| Bob Brines |
I.D. 40x8.5x8.5in port 3x4in. Finish is MinWax Golden Pecan and three coats of MinWax Tung Oil Finish on quarter-cut red oak veneer.
Bob |
|
|
| castlesteve |
Those look great Bob. How does the Fostex driver do at high frequencies? Does it need a supertweeter to give it the '' air '' that some fullrangers seem to lack?
I`ve been admiring those tls of yours for a while now. Up to now i`ve only tried BR designs with the FX200s but i`m considering giving yours a try. Can you share the dimensions so i can try a set for myself?
Regards, Steve. |
|
|
| Bob Brines |
Steve,
I did a conventional taper TL for the F200A, not the FX200. Never worked with the FX200. If you can stand the freight, the bottom of the F200A in a TL is phenominal. Tops not bad, but a super tweeter would help. Better hurry, though. I understand that teh are soon to be out-of-print.
If you look at the trace above, the FE167E goes strong to ~13K, then is down 3dB to above 20K. It does beam though. A super tweeter firing off-axis is often a good bet.
Bob |
|
|
| castlesteve |
Those look great Bob. How does the Fostex driver do at high frequencies? Does it need a supertweeter to give it the '' air '' that some fullrangers seem to lack?
I`ve been admiring those tls of yours for a while now. Up to now i`ve only tried BR designs with the FX200s but i`m considering giving yours a try. Can you share the dimensions so i can try a set for myself?
Regards, Steve. |
|
|
| navin |
| quote: | Originally posted by Bob Brines
[BI.D. 40x8.5x8.5in port 3x4in. [/B] |
we are looking at 42x10x10 outer dims considering 18mmm wood. just a bit larger than what my friend wants. he was looking at a 36"tall, 8" x 8" square.
| quote: | Originally posted by Bob Brines
Tops not bad, but a super tweeter would help. Better hurry, though. I understand that teh are soon to be out-of-print.
If you look at the trace above, the FE167E goes strong to ~13K, then is down 3dB to above 20K. It does beam though. A super tweeter firing off-axis is often a good bet. |
confused? will the F200A or FX200 be no longer produced? or are we talking about the 167?
so between the 3: 166, 167, 168 the 167 gets the nod for a small cabinet fullrange right? form what i understand so far the 168 was desinged for a horn. and the 167 is smoother than the 166. correct me if i am wrong. |
|
|
| Bob Brines |
| quote: | | we are looking at 42x10x10 outer dims considering 18mmm wood. just a bit larger than what my friend wants. he was looking at a 36"tall, 8" x 8" square. |
43x10.5x10.5 actually. You might be able to shoe-horn an FE167E into 36x8x8, but F3 will be 50Hz or higher.
| quote: | | confused? will the F200A or FX200 be no longer produced? or are we talking about the 167? |
The F200A and F120A are reported discontinued. I don't know about the FX200. The FE series is back in production in China.
| quote: | | so between the 3: 166, 167, 168 the 167 gets the nod for a small cabinet fullrange right? form what i understand so far the 168 was desinged for a horn. and the 167 is smoother than the 166. correct me if i am wrong. |
The FE167E is the one FE series driver with a Qts high enough to work in a BR or MLTL without resorting to a series resistor. All of the others are designed for back horns. I've never tried an FE166E because it won't work in the cabinets I design. Same goes for the 8"ers. The FE206E, the darling of the full-rangers, has way too low a Qts to work in a resonant cabinet. The FE207E is almost acceptable.
Bob |
|
|
| navin |
| quote: | Originally posted by Bob Brines
43x10.5x10.5 actually. You might be able to shoe-horn an FE167E into 36x8x8, but F3 will be 50Hz or higher.
Bob |
perfect. 50Hz is a bit higher than i expected (42Hz) but i assume the roll off wont be too fast and room gain (only 150 sq. ft with a 9 ft ceiling) will make up for it. right? |
|
|
| Bob Brines |
| quote: | Originally posted by navin
perfect. 50Hz is a bit higher than i expected (42Hz) but i assume the roll off wont be too fast and room gain (only 150 sq. ft with a 9 ft ceiling) will make up for it. right? |
You need to model your proposal. Putting a driver in too small a pipe has the same basic result as putting it in too small a BR. You will get a hump at and above cut-off. The roll-off will be quite sharp and 4th order. Room gain will only help 1/2 octave below cut-off and room gain may well make the speaker boomy at cut-off. Hoffmann's Iron Rule rules.
Bob |
|
|
| navin |
ooops!
ok since most of teh music will be jazz and vintage rock (1963-1980) i guess a in room F3 of 45Hz or so will do even if there is very little below that.
my worry however is the boom that Bob mentioned. |
|
|
|
