Hello.
I'm the owner of a HiVi D8.8 and I'm thinking about putting them to good use.
I have two v ariants in my head so far
A Tarkus clone
I came across the Tarkus project on Paul Carmody's website
https://sites.google.com/site/undefinition/floorstanding-speakers/tarkus
and its variant with HiVi. Thanks to the help of friends, I discovered that the project in question was called The Apaches, but photos etc are no longer available even from its builder.
Does anyone have any further information on this version of the project? I'm mainly interested in the crossover diagram. From the photos, you can only see the change in the shape of the baffle in the bass section, the use of HiVi D8.8+, HiVi D6.8 and ring radiator tweeter Peerless.
This is what the result might look like
The dimensions of the body are based on the original Tarkus, taking into account The Apaches.
From measured data and after simulation in WinISD - net volume 45l / 32 Hz / -3dB – 28 Hz.
The volume for the D6.8b is 15L (without deducting crossover speakers, etc.) and could be reduced to 9L or less with a vertical bulkhead.
HiVi Q1R is currently listed for treble (but instead of HiVi Q1R, I would prefer to use SB Acoustic SB26STAC).
I would like to divide the switch into two parts (location – red line in the corpus).
SICA coaxial
The second direction in which my thoughts go when using the HiVi D8.8 is its combination with a coaxial speaker. The advantages and disadvantages of coaxials are sufficiently described elsewhere, there is no point in rewriting them or discussing them endlessly. Coaxial is simply one option.
The SICA 5.5 C 1.5 CP coaxial speaker is available in Europe.
Datasheet:
https://sica.it/prodotto/5-5-c-15-cp/
The diBirama website published these measurements:
https://www.dibirama.altervista.org...5c1-5cp-8-coassiale-5-5-1-8-ohm-240-wmax.html
DIY constructions are available (not entirely obvious) and the speaker (definitely modified) is used in commercial loudspeakers.
DIY - Milan, Focus (center), Fiancino, Fianco. Cinque, Cubus Maximus.
Audiophile - SigbergAudio – SBS.1 and Manta.
I'm new here and I don't know the rules in detail. That's why I prefer to give only the names of the speakers without links and photos.
A picture is over 1000 words. The result could look like this:
Dimensions: 310 x 545 x 390 mm. The section through the loudspeaker is without drawn reinforcements for better clarity.
From measured data and after simulation in WinISD HiViVi D8.8 - net volume 35l / 34 Hz / -3dB – 30 Hz.
SICA – 3.2 l (max 7.25 l).
Is there a fatal problem in this solution, in the combination of SICA - HiVi?
The designs correspond to the measured parameters of the speakers and the simulation in WinISD. In the datasheet, the manufacturer recommends a volume of 30 l and tuning at 35 Hz
Red – 45 l
Green – 35 l
Here is a comparison of measurements of both M1 and M2 speakers with available datasheets:
And here is the Impedance frequency response:
For those interested, I would include Impedance frequency response files in txt or zma format. But I do not know how.
Nothing is decided.
Therefore, I am asking for your comments on what was written and tips for DIY construction with HiVi D8.8.
Thanks in advance for the advice and help.
I'm from Europe. Therefore, please, if you have shopping tips, only from the EU.
I have no reason to pay customs duties and taxes for imports from third countries.
I'm the owner of a HiVi D8.8 and I'm thinking about putting them to good use.
I have two v ariants in my head so far
- make a Tarkus clone
- 3 band using SICA 5.5 C 1.5 P coaxial (inspired by Adterion, Driva, Minerva, Monoculus, SBS.1 …) and stick to + / - manufacturer recommended volume.
A Tarkus clone
I came across the Tarkus project on Paul Carmody's website
https://sites.google.com/site/undefinition/floorstanding-speakers/tarkus
and its variant with HiVi. Thanks to the help of friends, I discovered that the project in question was called The Apaches, but photos etc are no longer available even from its builder.
Does anyone have any further information on this version of the project? I'm mainly interested in the crossover diagram. From the photos, you can only see the change in the shape of the baffle in the bass section, the use of HiVi D8.8+, HiVi D6.8 and ring radiator tweeter Peerless.
This is what the result might look like
The dimensions of the body are based on the original Tarkus, taking into account The Apaches.
From measured data and after simulation in WinISD - net volume 45l / 32 Hz / -3dB – 28 Hz.
The volume for the D6.8b is 15L (without deducting crossover speakers, etc.) and could be reduced to 9L or less with a vertical bulkhead.
HiVi Q1R is currently listed for treble (but instead of HiVi Q1R, I would prefer to use SB Acoustic SB26STAC).
I would like to divide the switch into two parts (location – red line in the corpus).
SICA coaxial
The second direction in which my thoughts go when using the HiVi D8.8 is its combination with a coaxial speaker. The advantages and disadvantages of coaxials are sufficiently described elsewhere, there is no point in rewriting them or discussing them endlessly. Coaxial is simply one option.
The SICA 5.5 C 1.5 CP coaxial speaker is available in Europe.
Datasheet:
https://sica.it/prodotto/5-5-c-15-cp/
The diBirama website published these measurements:
https://www.dibirama.altervista.org...5c1-5cp-8-coassiale-5-5-1-8-ohm-240-wmax.html
DIY constructions are available (not entirely obvious) and the speaker (definitely modified) is used in commercial loudspeakers.
DIY - Milan, Focus (center), Fiancino, Fianco. Cinque, Cubus Maximus.
Audiophile - SigbergAudio – SBS.1 and Manta.
I'm new here and I don't know the rules in detail. That's why I prefer to give only the names of the speakers without links and photos.
A picture is over 1000 words. The result could look like this:
Dimensions: 310 x 545 x 390 mm. The section through the loudspeaker is without drawn reinforcements for better clarity.
From measured data and after simulation in WinISD HiViVi D8.8 - net volume 35l / 34 Hz / -3dB – 30 Hz.
SICA – 3.2 l (max 7.25 l).
Is there a fatal problem in this solution, in the combination of SICA - HiVi?
The designs correspond to the measured parameters of the speakers and the simulation in WinISD. In the datasheet, the manufacturer recommends a volume of 30 l and tuning at 35 Hz
Red – 45 l
Green – 35 l
Here is a comparison of measurements of both M1 and M2 speakers with available datasheets:
And here is the Impedance frequency response:
For those interested, I would include Impedance frequency response files in txt or zma format. But I do not know how.
Nothing is decided.
Therefore, I am asking for your comments on what was written and tips for DIY construction with HiVi D8.8.
Thanks in advance for the advice and help.
I'm from Europe. Therefore, please, if you have shopping tips, only from the EU.
I have no reason to pay customs duties and taxes for imports from third countries.
Just another option, you could make a kind of KEF KC92 clone. Those drivers have good power handling. I use dual D6.8 in an active force cancelled configuration in some floorstanders.
I thought Carmody was designing mostly active speakers but I may be mistaken. Nevertheless, have you considered going active? I’ve not looked closely but seems the 8.8 might do well?
Well thought out ideas, best of luck to you ViteKM
Well thought out ideas, best of luck to you ViteKM
Thank you for a very interesting tip. I hadn't thought of this use of the D8.8. A 2.1 - SICA (closed box) and D8.8 push-pull (back to back) configuration could sound great.
Unfortunately, I do not have sufficient knowledge of push-pull (back to back) for the given construction. And I don't even have a quality amplifier for an active woofer.
Addition. The same concept as the KEF KC92 is used by the Dynaudio 18S.
Thank you for your support.
Carmody only has two active designs on the site I linked to - the Sprite and the Isetta in the Portable and Desktop Speakers category. I don't know if it has other active speakers. I do not know the full extent of his constructions. I didn't think about the active version. It could be a solution, but I prefer the classic passive version.
Hi VitekM,
I am curious about this comparison because it shows consistency between the drivers themselves, on the one hand, and between the two drivers and the data sheets, on the other. This is much better than my measurements of all HiVi drivers that I have measured.
It’s also interesting that you have found data sheets in the first. In the past, I have tried to find original data for D6.8B and D6.8 MKII, but unfortunately HiVi doesn’t seem to have an official website, which is weird because I remember seeing one before, but that was a long time ago.
Anyway, I am aware that my measurement system (DATS V.3) is probably not the best one for that purpose, but I have had much more consistent results with drivers from other manufacturers. How did you measure your drivers?
It depends on what you mean by "active". The Sprite and Isetta have passive contour filters but are active in that they have a built in amplifier module. Paul has no designs with active crossovers that I'm aware of.
To A4audio
I meant active - built-in amplifier. I don't know anything about designs with active crossovers either.
I meant active - built-in amplifier. I don't know anything about designs with active crossovers either.
Hi AllexKirilovMeasurements and comparison with datasheets are valid for old D8.8. I have had the datasheets for the D8.8 for a very long time (more than 10 years).
I also have measurements for other Swans HiVi speakers (F6N and TN28) and they did not turn out well. The differences compared to the datasheets are fundamental.
Measurement using the ARTA system.
Last edited:
If you were to pursue the Coax route, another option is to just purchase a pair of KEF Q150’s when on sale for $350 and harvest the drivers and crossovers from them……..the Uni-Q really is IMO the best 5” solution available with KEF having so many generations and R&D invested. If you compare the cost of a pair of the Sica 5.5 and the XO parts, you’re in the general area of costs.
If so, i would use the KEF driver in its own separate aperiodic enclosure crossed over to the 8.8 around 450hz. I modded my Q150’s to be semi cardioid and crossed at 100hz and they sound great. The cardioid is leaky so there’s less stored energy in the upper midrange and the 1khz resonance bump known to the UniQ is nearly gone
If so, i would use the KEF driver in its own separate aperiodic enclosure crossed over to the 8.8 around 450hz. I modded my Q150’s to be semi cardioid and crossed at 100hz and they sound great. The cardioid is leaky so there’s less stored energy in the upper midrange and the 1khz resonance bump known to the UniQ is nearly gone
to mayhem13
Citation is not working for your post.
I hope he registers my reaction.
Thanks for another tip.
I have to say that KEF was on my list when choosing a coaxial and I have no doubts about the quality. DIY constructions with their use and modifications are. But I didn't go into detail because I was put off by the higher price (the Q150 normally costs over $400). You're right that if you get it on sale, second hand, or just the individual speakers, it could be an interesting alternative to SICA, where I can have a pair for $175 and have another $175 left over for crossovers before I get to the sale price of the 350 $.
But enough of the numbers.
I'm just clarifying if I understood it correctly and there was no mistake in the translation.
You advise me
The result might look like this.
Dimensions (W x H x D) 303 x 550 x 385 mm.
The section through the loudspeaker is without drawn reinforcements for better clarity.
The partition between the D8.8 and the KEF is at an angle of 20° to accommodate a Flow Resistance Vent in the rear wall.
Volume for KEF – 8.4 l.
The width of the enclosure and the location of the KEF coaxial from the upper edge corresponds to the Q150.
Did I understand you correctly?
If I were to decide on this solution, can I contact you regarding the aperiodic cover? The latter could also be useful in the case of using SICA.
Citation is not working for your post.
I hope he registers my reaction.
Thanks for another tip.
I have to say that KEF was on my list when choosing a coaxial and I have no doubts about the quality. DIY constructions with their use and modifications are. But I didn't go into detail because I was put off by the higher price (the Q150 normally costs over $400). You're right that if you get it on sale, second hand, or just the individual speakers, it could be an interesting alternative to SICA, where I can have a pair for $175 and have another $175 left over for crossovers before I get to the sale price of the 350 $.
But enough of the numbers.
I'm just clarifying if I understood it correctly and there was no mistake in the translation.
You advise me
- place the KEF Q150 speaker in an aperiodic enclosure
- dividing frequency with D8.8 450 Hz (I considered dividing D8.8 between 300 - 400 Hz)
The result might look like this.
Dimensions (W x H x D) 303 x 550 x 385 mm.
The section through the loudspeaker is without drawn reinforcements for better clarity.
The partition between the D8.8 and the KEF is at an angle of 20° to accommodate a Flow Resistance Vent in the rear wall.
Volume for KEF – 8.4 l.
The width of the enclosure and the location of the KEF coaxial from the upper edge corresponds to the Q150.
Did I understand you correctly?
If I were to decide on this solution, can I contact you regarding the aperiodic cover? The latter could also be useful in the case of using SICA.
You’d want the vent in the separate air enclosure for the KEF……..I would figure on a simple port for the Hivi.
The goal with the aperoidic alignment for the KEF is to get rid of that resonance it has at 1khz or so…….if the Sica driver doesn’t have one, I’d still go aperoidic to smooth the impedance bump.
The vent cover can be stacked rings of different foams inside a short port tube……….do impedance sweeps to find with what thickness and types of foam you get the desired reduction in the drivers Impedance. Then do a response measurement and see how it looks.
I’d facet cut the upper left and right corners around the KEF to keep the original crossover baffle step in place and accurate…..facet down to within a half inch of the original Q150 box
The goal with the aperoidic alignment for the KEF is to get rid of that resonance it has at 1khz or so…….if the Sica driver doesn’t have one, I’d still go aperoidic to smooth the impedance bump.
The vent cover can be stacked rings of different foams inside a short port tube……….do impedance sweeps to find with what thickness and types of foam you get the desired reduction in the drivers Impedance. Then do a response measurement and see how it looks.
I’d facet cut the upper left and right corners around the KEF to keep the original crossover baffle step in place and accurate…..facet down to within a half inch of the original Q150 box