This one has been in the making for ages now (11 months I've just noticed), but I'm finally calling it finished, including the writeup.
It's a simple 9l ported enclosure with two notch filters. Measurements and design with lots of pics on the website:
http://www.vikash.info/audio/FR125S/index.asp
And a milestone has been reached for me, as it's the first time I've taken a design from start to finish including cabinet and filter design and measurements all by myself. Pat on the back please.
V
It's a simple 9l ported enclosure with two notch filters. Measurements and design with lots of pics on the website:
http://www.vikash.info/audio/FR125S/index.asp
And a milestone has been reached for me, as it's the first time I've taken a design from start to finish including cabinet and filter design and measurements all by myself. Pat on the back please.
V
Hi Vikash! Great looking website you put together. Just lovely!
I need to clean mine up since it's gotten rather out of hand.
Peace,
Godzilla
www.zillaspeak.com
I need to clean mine up since it's gotten rather out of hand.
Peace,
Godzilla
www.zillaspeak.com
Looks great!! I'm curious about something. Are the small humps in frequency response really worth all of the circuitry? I'll be curious to hear your thoughts if you try them with and without.
Beautiful finish job and nice site! Also, the Orions looks great, one beast of a project, I'd guess. Appears as though they're coming along nicely.
Beautiful finish job and nice site! Also, the Orions looks great, one beast of a project, I'd guess. Appears as though they're coming along nicely.
Now that is a good question! I think with a bit more tweaking the upper notch could be more effective. The notches are defintely needed IMO, but even then the upper response is still a little sharp - probably exagerated by the sequence of peak-dip-peak inherent in the natural fr. However the end result is still +/- 3db from 20-20k.one1speed said:
The Orions are coming on well. I'm currently auditioning amps for the required 8 channels. Some finished pics ( before the great hard drive crash of '06
) : http://www.diyaudio.com/forums/showthread.php?postid=1002813#post1002813Yes. I measure the low end response nearfield, summed port and driver response and adjusted for baffle step in software. The result is the FR shown. Bass is very nice. Sounds excellent in my smaller room, but a touch boomy in my long living room.andrewmc said:
Hi Vikash,
nice one!
Good to see some messurements of this setup - as I'm using a very simular one. I remember we discussed the notch filters a while back and I came to the same results, they do really improve the sound quality of the speaker.
After lots of testing and listening, I removed the upper filter and decided to listen about 15°-20° off axis, this way I find the HF actually very smooth and the sweetspot gets a bit "wider" ... but as always, that also depends on the room and it's reflecting surfaces.
cheers,
martin
nice one!
Good to see some messurements of this setup - as I'm using a very simular one. I remember we discussed the notch filters a while back and I came to the same results, they do really improve the sound quality of the speaker.
After lots of testing and listening, I removed the upper filter and decided to listen about 15°-20° off axis, this way I find the HF actually very smooth and the sweetspot gets a bit "wider" ... but as always, that also depends on the room and it's reflecting surfaces.
cheers,
martin
Hi LC, what filter values did you settle on? My values ended up being quite different from Validators so I'd be interested to see how yours turned out, especially if you have any measurements.
Hi Dan, how did the emulation turn out? On another note, I put some sine tones through a Tempest in free air today and was shocked how pin drop quiet the mechanism is even through large excursion.
Looking forward to using one...
V
Hi Dan, how did the emulation turn out? On another note, I put some sine tones through a Tempest in free air today and was shocked how pin drop quiet the mechanism is even through large excursion.
Looking forward to using one...V
I have just completed designing the filters for the 7 liter bass reflex box:
baffle step notch: L = 1.5 mH, C = 5.7 uF, R = 10 ohms
7 kHz notch: L = 0.1 mH, C = 4.3 or 5 uF, R = 15 ohms
This network is optimized for listening at 1 meter distance and also should sound very balanced slightly out of axis. Linearity is excellent and doesn't deviate more than +/-1 dB from the ideal line in the critical range. Tomorrow I will build and integrate the network and be able to verify this by ear.
Interestingly, my 9 liter bass reflex box doesn't sound better than the 7 liter box. I suspect that the drivers shouldn't be allowed to handle too low bass. This doesn't surprise me, Qts is on the high side.
In my opinion, the 7 kHz notch is necessary if the speakers are listened to at moderate to high levels. At low levels, it is not obtrusive.
baffle step notch: L = 1.5 mH, C = 5.7 uF, R = 10 ohms
7 kHz notch: L = 0.1 mH, C = 4.3 or 5 uF, R = 15 ohms
This network is optimized for listening at 1 meter distance and also should sound very balanced slightly out of axis. Linearity is excellent and doesn't deviate more than +/-1 dB from the ideal line in the critical range. Tomorrow I will build and integrate the network and be able to verify this by ear.
Interestingly, my 9 liter bass reflex box doesn't sound better than the 7 liter box. I suspect that the drivers shouldn't be allowed to handle too low bass. This doesn't surprise me, Qts is on the high side.
In my opinion, the 7 kHz notch is necessary if the speakers are listened to at moderate to high levels. At low levels, it is not obtrusive.
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