Art, there's no significant difference in the FR between the two conditions. I just posted the FR curves.
@Brian,
Are you saying that the HR sim estimates 3db more output than my cab? I thought the 96db@35hz was ok? Again I haven't seen the HR sim since I haven't had time to get familiar with HR. Could you share the input parameters as a screen shot?
Anybody else but CRESCENDO with real half space measurements of a TH18?
I think I know where at least some of the impedance misreading in REW can be found. I have a suspicion that I forgot to include all cabling for the impedance calibration being the resistance of the test leads. I will try again next weekend.
Are you saying that the HR sim estimates 3db more output than my cab? I thought the 96db@35hz was ok? Again I haven't seen the HR sim since I haven't had time to get familiar with HR. Could you share the input parameters as a screen shot?
Anybody else but CRESCENDO with real half space measurements of a TH18?
I think I know where at least some of the impedance misreading in REW can be found. I have a suspicion that I forgot to include all cabling for the impedance calibration being the resistance of the test leads. I will try again next weekend.
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Hi Andy, I tried to line up your measured response with the calculated one as best as I could. HornResp's calculations assume no losses, so the expectation is that, at least in the passband, the measured response is likely to be a bit lower than the HornResp prediction, how low being dependent on how "lossy" the build actually is (proper sealing and bracing will minimize these losses).
OTOH, you may see some gain at some frequencies, due to things like directivity due to the frontal size of the box.
IMO the issue with the impedance readings should be of more concern, because of that fairly large difference at the impedance minima.
Attachments
Used the TH-18's at a house party last weekend. Was the first time I heard rnb music (instead of EDM) on them and wow I've never heard such powerful and musical bass! Got a lot of "holy ****" comments about the size and sound of them at the party!
I'd love to become friends with your friends if a "house party" includes a full CDJ+DJM setup.
The REW file I posted is 2pi. The dip can be eliminated by adjusting the gate on the impulse response, I just cut the first few ms off with the gate accidentally. You can open the file and adjust the gate and all is well.
I wanna know where you can use a system like that and not have to worry about noise complaints. A pair of 18" THs in a room that big isn't sane.
Rather jealous.
Chris
wow did the utensils ,plates ,cups bottles stay firm in that house during that party? which speaker and amp were you using mr fenis?
We only really cranked it for 1 song at which point the neighbors complained but it was punching pretty hard! The rest of the night the cones were barely moving they are so efficient..
Top speakers were KV2 ESD12 and amps were Crown Itech 6000 for subs and Itech 4000 for tops - love this combo very smooth and punchy!
Top speakers were KV2 ESD12 and amps were Crown Itech 6000 for subs and Itech 4000 for tops - love this combo very smooth and punchy!
Fixed the IR windowing and added .9dB to compensate for 60Hz calibration with C weighted SPL meter.:
@Dan,
Was your measurement done with an input equivalent to 2.83 volts/8ohm driver?
And what was the position of the mic?
Was your measurement done with an input equivalent to 2.83 volts/8ohm driver?
And what was the position of the mic?
Yes, ground plane 10V 4Ω 5m IIRC. I'll check my notes tonight when I'm at home.
Hello, can anyone sim these cabs with 4x B&C pzb100 in it? I have these lying around and want to use them!
Thanks alot!
Thanks alot!
i simmed it
you can get a much flatter responce with the ~same volume for pzb.
imho
you can get a much flatter responce with the ~same volume for pzb.
imho
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i didn,t follow the cone correction debate,but without 8ltr vtc the upper end is indeed flatter.
but stil its lacking a bit low end(according to the sim)
but stil its lacking a bit low end(according to the sim)
I have a TH18 loaded with B&C 18SW115 FOUR ohm drivers.
I am wondering if this amp would be OK for it
https://www.minidsp.com/products/plate-amplifiers/pwr-dsp1
Noted at 2400 watts into 4 ohsm. ( I think someone said the driver I has reaches xmax at 1100 average)
Plenty of headroom so I dont think it would run out of capacitence driving a sub.
The risk I think is that the tapped horn might shake the amp to death.
I am wondering if this amp would be OK for it
https://www.minidsp.com/products/plate-amplifiers/pwr-dsp1
Noted at 2400 watts into 4 ohsm. ( I think someone said the driver I has reaches xmax at 1100 average)
Plenty of headroom so I dont think it would run out of capacitence driving a sub.
The risk I think is that the tapped horn might shake the amp to death.