hi team,
I managed to found 2 FW 305 and I'm thinking what to build w/ them - they will complement a backloaded horn Fostex 206 - so I'm looking at something fast. Amplification will be bi-amp w/ a dedicated Firstwatt amp (F5).
I was looking at the official DIY enclosure from Fostex and I wanted to check if any one has more creative ideas as well 🙂
Thank you, Fred
I managed to found 2 FW 305 and I'm thinking what to build w/ them - they will complement a backloaded horn Fostex 206 - so I'm looking at something fast. Amplification will be bi-amp w/ a dedicated Firstwatt amp (F5).
I was looking at the official DIY enclosure from Fostex and I wanted to check if any one has more creative ideas as well 🙂
Thank you, Fred
To be honest, the official box won't work very well. it's misaligned so the subbass will be very low. The port is also to small (7cm) so it will cough at full folume as the air velocity in the port is to high.
I would use a 85L box a port of 10cm diameter and a length of 12cm. That will give you a decent response to 40Hz and no port noise. Much lower than that won't be possible with this driver.
I would use a 85L box a port of 10cm diameter and a length of 12cm. That will give you a decent response to 40Hz and no port noise. Much lower than that won't be possible with this driver.
Why not? Just limits 25 Hz to ~108 dB/2pi/20 W/stereo and of course higher if up against a wall or in a corner with the trade off of being fairly large by today's standards. 'Perfect' alignment for high output impedance [tube] amps.
Classic BR [Vb = Vas/1.44, Fb = Fs]: ~176.39 L/6.3 ft^3 net
vent: 4" dia. x 5.71" = 16 m/s
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That is not a flat response, the lower subbass will be 5dB lower than the upper bass. And the OP is not using a tube amp, but a Nelson Pass designed F5 transistor amp. It's the old inaccurate way of building bass boxes in my opinion, and most are very disappointed when they hear such a cabinet, that's why i don't suggest it. Room modes may make it work for you, but for most it doesn't.
And this speaker driver in that kind of cabinet won't get to 108dB, if specs are right, 104dB is the max volume (which is already more than enough for home use, that is true).
Hi waxx and GM - thanks a lot for the insights.
Waxx would you mind expand on the comment of tube amp? I don’t get it actually.
Waxx would you mind expand on the comment of tube amp? I don’t get it actually.
Tube amps have a much more higher impendance (before the transformer) and a lower damping than solid state amps, so the speaker will react different. Tubes like high resistive loads (high impendance speakers), solid state can drive those also, but is more build for lower impendance speakers and have a much higher damping factor.