Mariusz_
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Posts posted by Mariusz_
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I modelled Jambo in Hornresp. I left the data file of it at my office PC, so wait until (European) Monday morning.
And a few hours more for Jamborette as I need to recalculate its size.
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I have a set of spikes to mount under.
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KG 3.5. I wanted them to have a present-day look and this is the outcome.
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Try to model this one:
THIELE SMALL PARAMETERSFs 40 HzRe 5.87 ΩQms 8.65Qes 0.22Qts 0.21Le 0.48 mhL2 3.09 mhR2 7.17 ΩVas 218.76 litresMms 74.36 gSd 855.3 cm2Cms 179.67 µm/NBL 22.44 T/mXmax 5.7 mmVd 0.473 litresPe 400W-
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Have you ever considered other than miniDSP kit active crossovers?
For example there is a kit available: Najda DSP by WAF with features which are not available in many OTC units.
These extra features are:
1. 48, 96, 192 khz sampling rates.
2. I2S input (with help of addtional USB-I2S converter one can connect PC and and stream all what one wants, files, Spotify, Tidal etc.)
3. Integrated volume control of analog outputs, IR operated (no need for pre-amplifier, one can use Najda like an ordinary integrated amplifier with volume knob)
4. Several preset crossover setups assigned to IR remote controller (gentle slopes for low volumes, extreme slopes for loud listening for example), changed instantaneously.
5. Swapable opamps.
Besides it has all kind of filters, delays, EQs, FIR. It accepts analog and diigital (SPDIF and optical) inputs, has 8 outputs, easy expandable to 10. Priced EUR300 ($330) without power supply.
I am going to set it up soon and will share using experience.
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6. Digital outputs (10 channels by SPIDF) so one can use Najda as pure crossover and further process divided signals in external DACs.
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I think that better imaging of LSII comes from the new crossover network. I also have LSII and I noticed that changing crossover for simpler one (lower order filters) deteriorated imaging.
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La scala II back chamber comes insulated with foam out of factory.
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Moray's k-tubes intrigued me and I have tried a very very simple set with my spare HF200. Too soon for conclusions, but sound has seemed to have both (good) features of horns (quick, detail) and direct radiators (hi-fi softness as opposite to PA power).
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I have both HF200 and HF204 (HF140 and HF144 with 2" adaptor).
They sound differently, for 2-way 204/144 is better, HF200/140 lacks some brightness.
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Bacek, try to model Monacor SP-38/300PA.
Impedance (Z) 8 Ω
Resonant frequency (fs) 48 Hz
Music power 600 WMAX
Power rating (P) 300 WRMS SPL (1 W/m) 99 dB
Suspension compl. (Cms) 0.21 mm/N
Moving mass (Mms) 78 g
Mech. Q factor (Qms) 5.68
Electr. Q factor (Qes) 0.24
Total Q factor (Qts) 0.23
Equivalent volume (Vas) 213 l
DC resistance (Re) 5.9 Ω
Force factor (BxL) 22.0 Tm
Voice coil induct. (Le) 1.2 mH
Linear excursion (XMAX) ±4 mm
Eff. cone area (Sd) 855 cm2
So we get Vb=60l and Fhm=417 Hz. Not bad.
Black: Monacor
Gray/Red: Peavey
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I will check, thank you.
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I have had a chance to check another driver with my Jabo 72 horn.
Recently I tested Faital HF200, Beyma CP750Ti and Faital HF204. My objective was finding best configuration for 2-way system with passive crossover, no EQ playing on top of La Scala II bass bin.
All the drivers are well suited for 2-way configuration and the final choice should be based only on listening preference’s. But I like to compare my subjective evaluation with objective measurements, that’s why I look at the charts background.
It seems that measurements confirm my listening impressions.
So:
1. Faital HF200 delivered soft, somewhat dim sound. It was most apparent at low and moderate volume. At loud listening this feature was less noticeable. At chart one can see that HF200 is quietest driver starting from 3000 cycles.
2. Beyma CP750Ti sounded very well balanced. But at moderate or loud volumes the sound was harder. I liked a lot of details I could listen to.
3. Faital HF204 had features of both above: more open sound, more highs than HF200 and also more pleasant sound than Beyma. At the moment it's my personal choice.
It is good to know the basic differences between these drivers.
HF 200: 2.91” titan diaphragm
Beyma: 2.97” titan diaphragm with mylar surround
HF204: 2.56” ketone polymer diaphragm
HF204 is smallest and polymer one – high frequencies did sound best. HF200 delivered the best low frequencies, when cut at 500hz (in this case “best” in terms of THD because I could not notice any difference when listening). Beyma looked very well when measured.
At the end I have to mention this again. I got very very good stereo imaging and resolution with LaScala II bass bin, Jabo 72 and tested drivers. From that moment on I never wanted to return to 3-way configuration. My conclusions refer to 2-way needs.
(the level is not calibrated to show absolute SPL, but the relative values are comparable, bass bin disconnected)
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It is right discussion to ask about something.
I am going to build a pair of La Scala bass bin. I have found a plan that is slightly different from LS 1 and LS 2. The most important difference is internal width dimension. It is 590mm instead of 565mm (23 1/4 instead of 22 1/4). Motorboard is also a bit wider (15 9/16 instead of 15 1/4).
Will this changes be audible? I hope not because I want to get LS sound.
The plan: http://www.mh-audio.nl/plans/other%20plans/La%20Scala%20Horn.pdf
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You might try EQing the two compression drivers to be flatter with respect to each other, then listen again. I've found that even small differences in FR can affect listening judgments fairly strongly.
Actually I did and I was able to make Faital curve match the one of Beyma. So it seems pretty easy to have the same frequency response.
Speaking of Be-diaphragmas I agree that their sound physics is amazing which results in superb performance. That's why I wonder how direct comparison of HF200 and HF204 in my 2-way system will be. The first has titanium, the latter polymer diaphragm. So sound of speed/density ratio should be twice as higher in HF204 than in HF200. (BTW this ratio for berylium is 6, for titanium 1, and about 2 for polymers).
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In this case flatter response didn't convince me. I can compromise on it for more pleasant sound of HF200.
BTW, I also checked that Beyma had more THD and intermodular distorsions - maybe this is the reason of HF200 listening advantage.
Soon I will compare Faital HF200 and HF204, stay tuned ;-)
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Recently I have put some horn - driver combinations on top of my La Scala II bass bin.
Maybe someone will be interested in my experience with Faital HF200 and Beyma CP750Ti.
I used them with big Jabo KH-72 horn. Actually I used HF200 and now I am testing Beyma.
So:
First, Jabo makes good 2-way configuration with La Scala. It sounds surprisingly good from 500hz to the high end.
Second, stereo imaging is the best I ever heard, it's clearly 2-way-with-crossing-low advantage.
Third, I can't tell at the moment which driver is better but they are different.
Faital is more "soft" and better for long listening.
Beyma sounds more clear due to being louder at mid highs and highs.
The chart shows the difference, look the lines from 2 khz. (the level is not calibrated to show absolute SPL, but the relative values are comparable, bass bin disconnected)
Mariusz
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I have Faital Pro HF200 16 ohm, which without the mouth adaptor is HF140 16 ohm.
But I have made mistake above. I have meant bigger LTH142 horn which I used with Faital Pro HF140 (as it is 1.4' horn).
Mariusz
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Have had the chance to compare the Faital elliptical horn and the similar sized 18Sound horn? Best regards Moray James.
I have had a kind of this experience. I used Faital HF200 in LTH102 but I didn't like the sound. It was too aggressive like PA and lacked some clarity in high tones. I even had to add tweeter to get some balance.
I didn't know what to blame, driver or horn.
Recently I have bought large German Jabo 72 and the situation is completely different now. Faital sounds like a new driver, balanced FC, no need to use tweeter anymore. So it seems, that LTH102 is strong PA horn, and for home usage it is better to find an other horn.
BTW, I also used smaller Jabo 53. Sound was better than LTH, but still lacked something. And KH-72 is perferct combination with Faital.
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Stereo imaging actually is good, but I noticed narrower sweet spot.
I also measured frequency response of speakers changing crossovers from AL-5 to universal. The outcomes were for sure biased by room acoustic and microphone quality, but on the charts differences have been clear during many trials.
The universal is constantly louder by 3db from 2000 to 3000 hz and at 3300+/- 100 hz the difference peaks to 10db (AL-5 goes down, the universal goes up) . And while measuring single drivers one can see different sloppiness of filters.
MAriusz
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I can hardly find anything about replacing AL-5 XO in LaScala 2.
Do people really like this crossover or do they not want to unscrew cabinets of LS2?
I did it and made myself XO based on ALK Universal schematics and differences are clear. But I also would not dare too choose the winner. My "universal" is more clear and open, more "live", but stereo imaging is worse comparing to AL-5 (probably a question of gentle and steeper slope respectively). AL-5 is a bit slower and calm at mid and high-range sounding less "live". AL-5 bass is stronger a bit.
I wish I could have the best features of them in one XO :-)
Anyone could share an own experience?
Mariusz
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I am new to old loudspeakers Klipsch world - as I bought KG 3.5 and Tangent 400 (which are not so easy to get in Europe).
When I compared KG and Tangent cabinets I noticed that Tangent was made with less dense MDF. And as a result it resonates and plays itself a bit - one can hear it while putting an ear on cabinet of the playing loudspeaker. I consider of making completely new heavy cabinet for these suberb set of drivers but maybe insulation would be enough?
What do you think about putting on inside walls an adhesive rubber (bituminous) mat (about 5mm thick)?
Thanks in advance,
Mariusz
Jamboree build thread
in Technical/Restorations
Posted
Try this for a Jamborette.
I hope I made it well for the bifurcated profile: lenght of one path and areas of two paths summed.