Simple & nice DIY proposal (FX120)

[martinsson]

Following my small tapped horn sub build (TH-Micro - a 6,5" tapped horn) it is now time for a set of small (again) satellite speakers to complement them, this is a proposal only, and as such not yet fully investigated.

Take a look at...

Martinsson`s Blog

...and tell me what you think, am I on the right track here ?





Best regards // martinsson

[planet10]

The overly small enclosure (i'd suggest 10 litre as a minimum), with wall proximity are likely to cause a big bump in the response. The same + the proximity of the back wall, will likely give a nasal, boxy midrange.

dave

[Crossblade]

Why don't you make a standard bookshelf to sit on top of your subwoofers, as showed in your blog? Using the same width will make it look like a modular two way speaker.

[martinsson]

Planet10 - why not try to break new ground, even if this would prove be a failure (I confess that have my doubts as well) it would still be a rather nice attempt at forging our passion with that of our better halfs

Simulations show no big deviations, but simulations only goes so far, i can see your point and it is indeed a valid one, but bare in mind that i will not be inended for use below 100Hz.

Crossblade - where is the beauty and challange in basic boring old cubic boxes ??? (but I agree, it would be easy and probably sound rather good aswell)

This is a quick rendering of my drawings, the fixing feature on the rear piece facing the wall is slightly different, and I will update my drawings accordingly.

[Nanook]

and try an open baffle if suitable for the drivers

[planet10]

Originally Posted by martinsson

Simulations show no big deviations, but simulations only goes so far, i can see your point and it is indeed a valid one, but bare in mind that i will not be inended for use below 100Hz.

If you believe the factory specs, the sim says you'll be fine to XO to a pair of woofers at ~120 Hz. My measures are a bit different, and boxes built to test which are more accurate indicate somewhere inbetween.

Factory specs are the flat curves, measured is the one with the big bump.

Careful XO could deal with the FR (this is where the droopy nature of a 2nd order PLLXO could come in handy), but the big issues to my mind is the potential for serious loss of midrange "cuppiness" due to no room to breath.

If you go for it, build a test box 1st.

dave

[martinsson]

I'm currently listening to them in open baffles, 470x1000mm driver symetrically placed.

I'm not that impressed sofar, but it has only been a few hours, do they need some break in time ?

[Jim Shearer]

If the FX120 sounds unimpressive, you might consider the amp you are using. I haven't tried FX120, but I have a pair of F120A which sound pitiful on any SS amp I have used. Put tubes on the F120A and they sing very sweetly!

Cheers, Jim

[Nanook]

Originally Posted by Jim Shearer

If the FX120 sounds unimpressive, you might consider the amp you are using. I haven't tried FX120, but I have a pair of F120A which sound pitiful on any SS amp I have used. Put tubes on the F120A and they sing very sweetly!

Perhaps ask the fullrangemeister specifically, but methinks a good class T or D amp would be ok as well

[Joe H]

I'm not that impressed so far, but it has only been a few hours, do they need some break in time ?[/QUOTE]

Mine improved with some break in time for sure .

This weekend I've been playing around with a PC based setup using the FX120 in a smallish ( 8) liter BR . The amp is a Ta2024 inside a topping external soundcard .
I lined up my threeway alongside for some A/B comparisons .. bit unfair perhaps .
So far .. Im definitely impressed by the FX120 s wonderful detail .. it seems to do most things very well . Somethings lacks ... for me that is , compared to my threeway ..I think the its a soundstage thing ... a little lifeless perhaps .. not sure .