I guess your 24" neo super woofer would be completely unusable for a two way with a large Woofer. Or am I wrong ?
Regards
Charles
Regards
Charles
At a glance it seems to be a perfect candidate for EBS alignment which is my preference for home HiFi woofers.
That said Vas is a bit high and price is WAY too high. I'm sure I could get less distortion using four BMS 12S330 per side saving a bit of space and a lot of money.
That said Vas is a bit high and price is WAY too high. I'm sure I could get less distortion using four BMS 12S330 per side saving a bit of space and a lot of money.
Well form the low-end POV the BMS would work. But the 15" Scan Speak could be used up higer than 1 kHz while the use of the BMS is not recommended past 300 Hz.
Regards
Charles
Regards
Charles
Hello all... With my brief post yesterday (#5) I should have been a bit more specific. Scan Speak is a great manufacturer. Use their drivers frequently. My point was perfromance vs. price in hi-fi applications. I have little doubt this E 15 is well engineered and a quality product. Just not practical for home hi-fi. As for Altec, I was referring to 15" low Q, high effieciency drivers, 515's and so on. Large mid bass drivers actually. You can help them play low, but it take a refridgerator sized enclosure to do it using EBS alignments. You have to accept the sagg in the mid bass response, which is unfortunate. Right were a driver like this shines, you detract from it's main advantage. (mid bass resolution) My $0.02 worth!
Maybe with a 8" fullrange driver....was reminded because I just saw it listed in Canadian dollars recently(made in Canada). Harbottle Audio Group Buy 24UHT Closes December 31st 11:59:59 PM - Bass Gear - Data-Bass Forums
I think this driver would do well in a two-way. Much less expensive of course.
Eighteen Sound - Professional loudspeakers
Eighteen Sound - Professional loudspeakers
True but I also favour 3ways over 2ways so it is of little interest to me if a woofer goes beyond 300Hz.
Calculators usually fail to give optimal results for low Qts drivers.
The trick is to make box volume around Vas and tune the port to Fs.
This gives you an EBS alignment and the low bass is in real life usually boosted sufficiently by room gain. If that does not work the old traditional bass control that amps used to invariably have (shelving eq at about 100Hz) will do the trick.
Long time reader, first time posting
Looking for constructive-ish criticism here. I am well aware these drivers are rather expensive. Part of my selection criteria is aesthetics..., my intent is not so much Diy home audio though I started diy speaker building in college and now have my own company that is dedicated to loudspeakers, which is a very NON-lucrative Loudspeaker company with only me as employe who does all the work, so in a sense I am do it yourself.. Please dont kick me off your website, I need help where ever I can get it.
So I purchased 4 of the 38WE/8582T00 woofers and plan to use them in a 5 way production active speaker. The 38WE would be used from 70-80 Hz or so to 200-250 Hz. They would be wired in parallel and run on a single 1000w rms amp rated at 4 ohms. The main questions I have for you guys is should I make the cabinet housing these drivers sealed (Fs/qts 26/0.24 = >100....so kinda answered my question but im sure they are nuances I am unaware of..or maybe not) or go the Bass reflex route with a shorter port tuning to achieve the around 75-80 Hz? [my motivation for going sealed route is to avoid the two large impedance spikes that come with the port design for a single spike] the Fs is 26hz...so yep thats where Im at currently debating with myself... I am sure I am forgetting something anyway any help would go a long way.. thanks
* The lowest octaves are handled by two 32W-4878T00 (on mounted on back of each tower) these I am pretty set on running in sealed enclosure and each run on own Hypex 501 amps and using the dsp to push it to work lower possibly/ideally getting the f3 around 25Hz and adding 5-6 dB gain in hypex setting to match level of rest of system.
Background: I started a speaker company almost 2 years ago and have only done custom work as of now, mostly for restaurants and bars. All my designs up to this point have been done in collaboration/with the oversight of Christian of Solen(I live/work 20 mins away from their warehouse so it makes things easy to test/ return and such) I am planing on offering up my first design production speaker this year for sale, It's a 5 way active speaker, currently starting off the r&d. Hoping to have a couple pairs made for 2022 audio show circuit. Would appreciate any help/feedback I can get. I added a picture of my design as I did not want to write it all down here (picture worth 1000 words..and such) Please let me know what you think
Kind regards,
Michael
Looking for constructive-ish criticism here. I am well aware these drivers are rather expensive. Part of my selection criteria is aesthetics..., my intent is not so much Diy home audio though I started diy speaker building in college and now have my own company that is dedicated to loudspeakers, which is a very NON-lucrative Loudspeaker company with only me as employe who does all the work, so in a sense I am do it yourself.. Please dont kick me off your website, I need help where ever I can get it.
So I purchased 4 of the 38WE/8582T00 woofers and plan to use them in a 5 way production active speaker. The 38WE would be used from 70-80 Hz or so to 200-250 Hz. They would be wired in parallel and run on a single 1000w rms amp rated at 4 ohms. The main questions I have for you guys is should I make the cabinet housing these drivers sealed (Fs/qts 26/0.24 = >100....so kinda answered my question but im sure they are nuances I am unaware of..or maybe not) or go the Bass reflex route with a shorter port tuning to achieve the around 75-80 Hz? [my motivation for going sealed route is to avoid the two large impedance spikes that come with the port design for a single spike] the Fs is 26hz...so yep thats where Im at currently debating with myself... I am sure I am forgetting something anyway any help would go a long way.. thanks
* The lowest octaves are handled by two 32W-4878T00 (on mounted on back of each tower) these I am pretty set on running in sealed enclosure and each run on own Hypex 501 amps and using the dsp to push it to work lower possibly/ideally getting the f3 around 25Hz and adding 5-6 dB gain in hypex setting to match level of rest of system.
Background: I started a speaker company almost 2 years ago and have only done custom work as of now, mostly for restaurants and bars. All my designs up to this point have been done in collaboration/with the oversight of Christian of Solen(I live/work 20 mins away from their warehouse so it makes things easy to test/ return and such) I am planing on offering up my first design production speaker this year for sale, It's a 5 way active speaker, currently starting off the r&d. Hoping to have a couple pairs made for 2022 audio show circuit. Would appreciate any help/feedback I can get. I added a picture of my design as I did not want to write it all down here (picture worth 1000 words..and such) Please let me know what you think
Kind regards,
Michael
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There are many positive points on such large drivers. Elliptic voice coil and cones have better way to handle the rocking modes. At least some what minimization.
Also such large drivers when you have rubber have damping challenges. Hence Scan speak choosing a fabric surround is in fact a good idea in reducing the mass and also the rubber ringing.
Having a large driver with lower mass and also higher sensitivity with neo magnets even for decent spl the cone moves very little in stereo listening reducing the distortions to substantial level.
Scanspeak engineers are of course took an intelligent approach doing this way. One thing concerns is the very low Qt I dont understand why one is going with such low Qt for many of their new drivers which infact is not required and also the tuning and excursion becomes much over the limits when no crossover used.
Overall for the conventional music listening with such large driver with fabric surround is one super positive move done by the scanspeak.
Also such large drivers when you have rubber have damping challenges. Hence Scan speak choosing a fabric surround is in fact a good idea in reducing the mass and also the rubber ringing.
Having a large driver with lower mass and also higher sensitivity with neo magnets even for decent spl the cone moves very little in stereo listening reducing the distortions to substantial level.
Scanspeak engineers are of course took an intelligent approach doing this way. One thing concerns is the very low Qt I dont understand why one is going with such low Qt for many of their new drivers which infact is not required and also the tuning and excursion becomes much over the limits when no crossover used.
Overall for the conventional music listening with such large driver with fabric surround is one super positive move done by the scanspeak.
I hope you do not intend to make money with this business. Even the best speaker designers are not guaranteed to find financial success, and from the way you describe things, I think you are biting off more than you can chew.
Supravox 380 GMF would be one serious competioner (and cheaper) to TAD 1601 and ellipticor 15".
https://www.supravox.fr/en/produit/380-gmf-bass-driver-98db-8-ohms/
Supravox's alnico brother 380-2000OB measures very nicely in the dibirama test.
https://www.supravox.fr/en/produit/380-gmf-bass-driver-98db-8-ohms/
Supravox's alnico brother 380-2000OB measures very nicely in the dibirama test.
why low Qms is bad ? can you explain please, i have NAIM DBL with ATC 15" woofer with Qms 1.59 , they sound great.
None of the above 15" drivers has the acceleration of the new Ellipticor, the closest rival is BMS with 15% less acceleration
why low Q would be bad thing, a perfect woofer would have no resonance, i.e. flat impedance and flat spl and flat line means Q=0, or i miss something ? Isn't Q a measure of the steepness of the resonance i.e. the Fs devided by the bandwidth at -3dB? so flat response infinite bandwidth and zero Q ?
There are two sources of damping at the resonance frequency (Fs); the electrical damping measured by Qes and the mechanical damping measured by Qms. It is best if most of the damping is electrical because it is more stable and reliable than the mechanical damping. This means that Qes should be low, and close in value to Qts, while Qms is much higher. An example would be a Qts = 0.375, Qes = 0.400, Qms=6.0. In this case, almost all the damping comes from the motor.
1/Qts = 1/Qes + 1/Qms
A low Qms means high mechanical resistance, which means more heat is absorbed by the voice coil, which is not desirable because a dynamic driver has very low efficiency and a high mechanical resistance reduces it even more.
interesting, i though Cms is the mechanical resistance (or so called compliance, also measured mm/N. Qms is a ratio of steepness of the mechanical resonance ...
The compliance (Cms) is a different thing than the mechanical resistance (Rms).
But according to the factory datasheet or the Audioxpress measurement, the Qms of the 15" Ellipticor is around 3, which is not I would call low.
https://audioxpress.com/article/tes...-8582t00-15-ellipticor-oval-voice-coil-woofer
But according to the factory datasheet or the Audioxpress measurement, the Qms of the 15" Ellipticor is around 3, which is not I would call low.
https://audioxpress.com/article/tes...-8582t00-15-ellipticor-oval-voice-coil-woofer
Has anyone looked into making the cone elliptical rather than the voice coil? Just wondering if it is a better way to spend the funds. Also I would hate to have a 10 year old elliptical driver fail due to poor voice coil soldering and have to replace it.