Best Enclosure Design for Faital Pro 18FH500

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Yotomeczek

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Joined 2011
#1
I'm going to build loudspeaker like Dynamikks Monitor 12.18.
There are two Faital Pro 18FH500 in the boxes waiting 🙂
Crossover about 100Hz (passive).
First idea was bass-reflex (200dm3/8ft3) with bigger ports but maybe it is better enclosure for 18FH500? I want quick low bass. Loudspeaker must be placement near the wall.
I don't know if 18FH500 are compatible with Onken (can't find any easy to use calculator).
 
#2
Yotomeczek said:
I'm going to build loudspeaker like Dynamikks Monitor 12.18.
There are two Faital Pro 18FH500 in the boxes waiting 🙂
Crossover about 100Hz (passive).
First idea was bass-reflex (200dm3/8ft3) with bigger ports but maybe it is better enclosure for 18FH500? I want quick low bass. Loudspeaker must be placement near the wall.
I don't know if 18FH500 are compatible with Onken (can't find any easy to use calculator).
Click to expand...

100Hz PASSIVE crossover... Ouch, that sounds expensive.

Why choose so low a crossover frequency?
 
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#5
You could start with something like this: ZOUDIO AIO4CH – Z O U D I O If you add a 24 V SMPS, you have a stereo active filter and amplifier for the price of a just passive filter.

It beats having a passive filter anyway as you can experiment with the best crossover, before deciding on a permanent setting. Personally I don't like crossing an 18" higher then 80 - 100 Hz and with a decent 12" coax you won't have to.
 
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#6
Rademakers said:
You could start with something like this: ZOUDIO AIO4CH – Z O U D I O If you add a 24 V SMPS, you have a stereo active filter and amplifier for the price of a just passive filter.

It beats having a passive filter anyway as you can experiment with the best crossover, before deciding on a permanent setting. Personally I don't like crossing an 18" higher then 80 - 100 Hz and with a decent 12" coax you won't have to.
Click to expand...

Nice stuff - thx 🙂
 
#7
Greets!

'Best' is what best meets your space, performance requirements, so based on what little has been posted and lacking any measured specs, this is the pioneer's [pre T/S] Classic alignment for best trade-off between size, bass output [Vb = Vas/1.44, Fb = Fs] and my preference of Vb = Vas, Fb = 0.81x Fs.

GM
 

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#8
From this calculator I've got:
Cabinet volume in litres: 227.3
Cut-off frequency f3 (-3dB) in Hz: 37
Cut-off frequency f8 (-8dB) in Hz: 29

This classic bass-reflex is quite big (but not 0.81 x Vas = 300 liters) - f3 is quite good 🙂
I think that 230 liters of cabinet volume is near the maximum for me.
Is the Classic alignment [Vb = Vas/1.44 = 260 lites, Fb = Fs] better than calculated in Volume Calculator For Vented Loudspeaker (this didn't show Fb even)?
I tried to use WinISD 0.50a7 but it just didn't work at all.
 
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#9
?? I don't follow. I mean using the closed box: Volume Calculator For Closed Cabinets

------------------------------ Driver ------------------------------- -------- Loudspeaker ------
Resonance frequency
fs in Hz: Equivalent volume of
compliance Vas in litre: Total driver Q factor Qts: total Q factor Qtc:
Recommended: 0.71
30
374.08
0.38
0.71

Volume in litre:
122.9 (150)
1)
Cut-off frequency f3 (-3dB) in Hz:
66
Cut-off frequency f8 (-8dB) in Hz:
42
Efficiency in dB (1W/1m):
96

=========================

Qts correction calculator
(Qts-Correction) Q factors Qes, Qms to be entered with two decimals
Please enter decimal separators as "."
------------------------------ Driver ------------------------------- ----- Crossover, Cable -----
Electrical Q factor Qes: Mechanical Q factor Qms: DC resistance Re: Coil's DC resistance R ... in Ohm:
.36
12.5
5.1
.5
Qts old of driver only:
0.35
Qts new with cable, coil, ...:
0.38

GM
 
#11
Yotomeczek said:
From this calculator I've got:
Cabinet volume in litres: 227.3
Cut-off frequency f3 (-3dB) in Hz: 37
Cut-off frequency f8 (-8dB) in Hz: 29
Click to expand...

With this calculator I get this near 300 L alignment, so how did you get such a small cab? :

Bass Reflex Cabinet
(Vented Cabinet) according to Hoge Internal volume with one decimal
Please enter decimal separator as "."
------------------------------ Driver ------------------------------- -------- Bass Reflex Tube --------
Resonance Frequency
fs in Hz: Equivalent volume of compliance
Vas in litre: Driver's total Q factor Qts: Diameter
in cm: *) No of Tubes:*)
30
374.08
0.38
25.4
1

Cabinet volume in litres:
298.3
Cut-off frequency f3 (-3dB) in Hz:
33
Cut-off frequency f8 (-8dB) in Hz:
26
Efficiency in dB (1W/1m):
96
*) Please note:
The bass reflex tube should have at least 1/3 of the driver's diameter to prevent singing noise
(for two tubes ¼, for 3 tubes 1/5, for four 1/6). . Length of bass reflex tube(s) in cm
31.5
Diameter of bass reflex tube(s) in cm
25.4
No of bass reflex tubes
1
Total area of bass reflex tube(s) in cm2
507
Ql
7

================================


Qts Correction Calculator
(Qts-Correction) Q factor Qes, Qms to be entered with two decimals
Please enter decimal separators as "."
------------------------------ Driver ------------------------------- ----- Crossover, cable -----
Electrical Q factor Qes: Mechanical Q factor Qms: DC resistance Re: Coil's DC resistance R ... in Ohm:
.36
12.5
5.1
.5
Qts old of the driver only:
0.35
Qts new with cable, coil, ...:
0.38

GM
 
#12
Like this:
BR.jpg

You typed Qts=0.38 not 0.35 - and it give 298 liters
 
#15
GM said:
Here's an Onken Excel WS: http://www.audiodesignguide.com/HiEff/ONKEN_SP-15A-402PA.xls and online version of it: HiFi Loudspeaker Design

Note that the n = 5.7 is the classic [Vb = Vas/1.44].

Technically, better to use a single large vent and critically damp it using an impulse response test if using a computer program, otherwise: Click Test | GM210 | Flickr

GM
Click to expand...

Thx a lot 🙂
I calculated 18FH500 and it's not driver for Onken - total port area is too small (about 1/2 of Sd) when Port length are acceptable. Vb total is about 430 liters 🙂
Is the Onken just type of overlarge Bass-Reflex or something else?
I think I should project B-R bigger than calculator says, with one big port (with area about 0,2-0,25 Sd of speaker). Right?
 
#16
You're welcome! It was hypothesized as a type of TL, but it's just a multiple vent BR: Untitled Document

To get a low vent mach with a high Xmax driver you need at least a Av = Sd/2 vent with some needing Sd/1.33 or even Sd = Av. Use Hornresp or similar to most accurately confirm vent mach.

At this point, better to morph the volumes, lengths into a straight or folded inverse tapered TQWT.

GM
 
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#17
that driver and GM's input make a nice speaker - it would make a nice enough Karlson punch (36"x22.5"x18") box with no low end for bass guitar. I played some live stuff with a weak CTS 15" n a Traynor 30 watt push pull EL34 combo amp - the reflex chamber had less than 2 cubic foot volume - muddy,distorted - probably nothing under 80Hz - lol. An open E (41Hz but with harmonics stronger than the fundamental with round wound strings, was rarely played. Usually nothing below a "G" on a 4-sting bass E string.

https://i.imgur.com/20RECmW.png
 
Last edited:
#18
freddi said:
that driver and GM's input make a nice speaker - it would make a nice enough Karlson punch (36"x22.5"x18") box with no low end for bass guitar. I played some live stuff with a weak CTS 15" n a Traynor 30 watt push pull EL34 combo amp - the reflex chamber had less than 2 cubic foot volume - muddy,distorted - probably nothing under 80Hz - lol. An open E (41Hz but with harmonics stronger than the fundamental with round wound strings, was rarely played. Usually nothing below a "G" on a 4-sting bass E string.

https://i.imgur.com/20RECmW.png
Click to expand...

I think that I need low bass - I've got only one system fo music and TV/films - soo low freq are needed.
 
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