FOSTEX FE-127E


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At first I was trying to build reasonable sounding enclosures for my PC. But, I knew from the very start that their bass response might not satisfy me at all. I am not used to listening to loudspeakers with a f3 of 70 Hz. Therefore, with the suggestion of my friend Tugrul Oncel, I have started to build these. I have bought the speaker units from Madisound with ease and I did the carpentry myself.

The enclosures are easy to build. They may take 2 - 3 hours to finish if you start from where I have started. I had the pieces cut to sizes in Bauhouse and brought them home. You can see that the rear panel is not perpendicular to the floor, and the guys at Bauhouse don't interfere with such nasty business and they don't cut out any holes. As you have figured I had to cut the side panels and cut out the driver holes.

The rear bend is 10 degrees and there are two panels in one enclosure that needs to be cut. Also you have to cut out two speaker holes. It took me one-hour to do all the jigsaw work. 

When it comes to putting the pieces together you have to follow a certain order in order not to have problems towards to the end of this sequence. The panel at the top must be mounted to the front panel at first. Then you should mount that two to a side panel. After that you have to mount the bottom panel to that structure. By this way you may be able to keep the panels perpendicular to each other without using any tools. Then you should mount the rear panel and with reference to that you have to mount the inner transmission-line panel. The panel in the rear chamber must be mounted after that. And the other side panel must be mounted after placing the absorbing material inside the enclosure. The driver hole will be very small for that purpose.

The absorbing materials must totally cover the top panel and the panel in the rear chamber. You will need two 25 cm and 30 - 40 cm fibers with 3 cm thickness. You may need to glue them on the panels from inside. To do that I suggest you to use hot glue gun.

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As for the sound character, you should place this enclosure close to the corners. Then they will start to show what they have got. On the other hand, since they have a slightly limited high frequency response you may consider pulling them back from corners in order to balance that. However, since the high frequency expansion is slightly limited, you may find yourself in a position where you have to decide between achieving more low frequency response and balanced sound. I must tell you this enclosure has an additive low frequency response! You may find your sub-woofer useless and I mean it. The enclosure gives FE-127E a wide band loading and the mid-bass response is very accurate. You appreciate it even more when you are listening to male vocals. The bass is clean and far away from being “one-note” like in all other type of enclosures. You can also listen to music at higher levels because of this loading. Although the Xmax limit is very tight, the wide band loading of the enclosure controls the speaker cone perfectly. But, in some recordings, which are engineered by deaf recording engineers, the low frequencies can be at very high levels. Only in those types of recordings you feel the Doppler Distortion on high piano and some electro-guitar notes. The sound is calm and effortless. The sound stage is wide and the speakers do disappear. They give a very nice sense of depth and height, which you wouldn’t expect to receive from a speaker this small. They fall a little bit behind when it comes to being attack, but I don’t regard this as a setback considering all the other positive aspects.

The total cost of the enclosure can be around 150 USD without the finish. I have bought my speaker units from Madisound, 35.00 USD each and I have paid a fortune to FedEX. The material needed for to construct the enclosure cost me something around 35 USD.

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REAL LIFE MEASUREMENTS

 

Impedance (Red) Phase (Green)

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MLS Measurement (Red with Time Window)

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Distorsion Measurement (Green 1st, Blue 2nd, Yellow 3rd and Magenta 4th) 

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