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Old 11th December 2008, 09:29 AM   #1
nandax is offline nandax  Indonesia
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Default Question full range speaker

i am currently using Visaton FR 12 8 ohm
http://www.visaton.com/en/industrie/...nd/fr12_8.html
i made passive bandpass filter to adjust the cut off frequency
because the freq response (f(-10 db)) = 70- 18000Hz
but i have the problem with the treble sound , if there is high pitch the sound becomes bad..
can someone give me suggestion please..
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Old 11th December 2008, 02:25 PM   #2
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Hi nandax, can you post a description of your enclosure, and the circuit with the component values?
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Old 11th December 2008, 02:33 PM   #3
chops is offline chops  United States
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Default Re: Question full range speaker

Quote:
Originally posted by nandax
if there is high pitch the sound becomes bad..

What do you mean by this? Does it get harsh sounding or dull, muddy sounding?
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Old 12th December 2008, 09:51 AM   #4
nandax is offline nandax  Indonesia
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Quote:
Originally posted by rjbond3rd
Hi nandax, can you post a description of your enclosure, and the circuit with the component values?
Rated power 15 W
Maximum power 40 W
Nominal impedance Z 8 Ohm
Frequency response (f(-10db)) 7018000 Hz
Mean sound pressure level 85 dB (1 W/1 m)
Maximum cone displacement 5 mm
Resonance frequency fs 110 Hz
Magnetic induction 0,8 T
Magnetic flux 150 Wb
Height of front pole-plate 3 mm
Voice coil diameter 20 mm
Height of winding 4,5 mm
Cutout diameter 114 mm
Net weight 0,284 kg
D.C. resistance Rdc 6,8 Ohm
Mechanical Q factor Qms 5,61
Electrical Q factor Qes 2,8
Total Q factor Qts 1,87
Equivalent volume Vas 8,7 l
Effective piston area Sd 87 cm
Dynamically moved mass Mms 3,8 g
Force factor Bxl 1,7 T m
Inductance of the voice coil L 0,22 mH
Heat resistance −25 ... 70 C

that is the description of my speaker i used
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Old 12th December 2008, 10:01 AM   #5
nandax is offline nandax  Indonesia
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Default Re: Re: Question full range speaker

Quote:
Originally posted by chops



What do you mean by this? Does it get harsh sounding or dull, muddy sounding?
I'm sorry but i couldnt attach the schematic, i dont know why..

what i mean the sound getting harsh when it goes to treble sound or if I increase the volume
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Old 12th December 2008, 11:16 AM   #6
Piek is offline Piek  Europe
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Hi,

I tried Boxsim (Visaton driver simulations software with measured data), something like this could sound more relaxed:

Click the image to open in full size.
Dashed line is without filter, simulated in a 30x20cm Baffle 30l Closed Box.

-Micha
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Old 12th December 2008, 01:51 PM   #7
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Hi nandax, without the schematic and box dimensions, it's hard to say. The circuit's design might be at fault, or it might be an individual component that is defective, or the amp, or a driver etc. It could be anything.

Did you design the circuit, or did the design come from elsewhere?
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Old 12th December 2008, 02:24 PM   #8
chops is offline chops  United States
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What are the cutoff frequencies of the bandpass? Also, you might need to insert a Baffle Step Compensation (BSC) circuit to tame that top end harshness. From what you've described, it sounds like the typical effects of a fullrange driver.
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Old 12th December 2008, 02:42 PM   #9
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Hi chops, my take is that he's describing something that sounds like clipping, because it appears when he turns up the volume.

(Box dims and schematic would tell us if there was any attempted BSC in there.)
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Old 12th December 2008, 03:11 PM   #10
chops is offline chops  United States
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Quote:
Originally posted by rjbond3rd
Hi chops, my take is that he's describing something that sounds like clipping, because it appears when he turns up the volume.

(Box dims and schematic would tell us if there was any attempted BSC in there.)

That's what I was thinking at first as well, until he said "the sound getting harsh when it goes to treble sound or if I increase the volume".

To me, that would mean that the treble is harsh even within the clean operating range of the amp/driver.
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