Named after one of my favorite sports cars.. now have all the drivers for this project, aiming to complete by end of July.
Drive units are Viawave GRT145 ribbon/Accuton Cell C90, Dayton ES180Ti.
Crossover points roughly 2750hz and 330hz altho nothing modelled yet.
Wd like to try 3 bass drivers, but may revert to 2 if response doesnt add up. Also thinking to use the Accuton in a semi open baffle set up, with some sound deadening behind driver.
Cabinets may raise a few eyebrows, in looks and material choice.
Sketches of cabs to follow, will start project May 10th.
Drive units are Viawave GRT145 ribbon/Accuton Cell C90, Dayton ES180Ti.
Crossover points roughly 2750hz and 330hz altho nothing modelled yet.
Wd like to try 3 bass drivers, but may revert to 2 if response doesnt add up. Also thinking to use the Accuton in a semi open baffle set up, with some sound deadening behind driver.
Cabinets may raise a few eyebrows, in looks and material choice.
Sketches of cabs to follow, will start project May 10th.
Thanks! Couldnt afford to buy the Accuton's until now.
Cell C90 is small, cone is roughly 4.5- 4.75"- but they weigh alot.. heavier than the ES180ti drivers.
A close up of Cell and Viawave
The large radius edge rounds on the Magico S5 cabinet model well for low diffraction, which both simplifies the crossover and reduces distortion.
The 7" Satori MW19P-8 with Fs = 32.2Hz would be another midbass option... same limited bass. Sonic alternative to Dayton rigid woven glass fiber cone.
The 8" SB_Acoustics SB23NRXS45-8 produces -F3=28Hz in 2.3cuft ported volume.
--IDEAL CHOICE for very popular TM-WW cabinets like: Avalon, Sony SS-AR1, Wilson, Jensen, and shorter Magico.
--A 3-stack in 6cuft ported would ROCK.
--Top rated small woofer.
The 7" Satori MW19P-8 with Fs = 32.2Hz would be another midbass option... same limited bass. Sonic alternative to Dayton rigid woven glass fiber cone.
The 8" SB_Acoustics SB23NRXS45-8 produces -F3=28Hz in 2.3cuft ported volume.
--IDEAL CHOICE for very popular TM-WW cabinets like: Avalon, Sony SS-AR1, Wilson, Jensen, and shorter Magico.
--A 3-stack in 6cuft ported would ROCK.
--Top rated small woofer.
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Alot of people have recently asked questions on how to implement a 3 bass driver design.TMM was v helpful in explaining the issues re my driver choice in a '3 stack'. Peter Schumacher on PETT also explained how it can be made to work. Either way, let's try it and see. The bass section wd need to be at least 65litre, so it will need to be a large cab
Also v interesting post about magico cabs. I have a small 3D printer at work so thought to print a 'semi' grill for the Dayton woofers. It would just act as a part guard and ring cover
Also v interesting post about magico cabs. I have a small 3D printer at work so thought to print a 'semi' grill for the Dayton woofers. It would just act as a part guard and ring cover
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Are you starting with the AudioExpress ES180Ti-8 measurements?
Test Bench - Dayton Audio ES180Ti-8 7” High-End Midbass Woofer | audioXpress
Test Bench - Dayton Audio ES180Ti-8 7” High-End Midbass Woofer | audioXpress
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With the inductor altering qts slightly, I reckon the Dayton's will hit 30hz f3 ported. I did a quick sim - a slightly smaller than optimum volume will produce a gentle slope below 50hz. That's one option anyway
C90 with open and narrow baffle will get stressed below 500Hz. It will have 6dB/oct slope naturally, so just 6dB/oct electric to accompany will result in LR2 acoustic.
You must measure all drivers in the final baffle and "box" to be sure, also off-axis and distortion! Then you will have more solid basis to start thinking about crossovers. I recmmend to simply just make a closed box for it!
C90 distortion from hificompass, H2 rising below 300Hz
This is Edge simulation of a C90 size driver in narrow baffle, dipole (almost equal to open back with light stuffing)
You must measure all drivers in the final baffle and "box" to be sure, also off-axis and distortion! Then you will have more solid basis to start thinking about crossovers. I recmmend to simply just make a closed box for it!
C90 distortion from hificompass, H2 rising below 300Hz
An externally hosted image should be here but it was not working when we last tested it.
This is Edge simulation of a C90 size driver in narrow baffle, dipole (almost equal to open back with light stuffing)
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Ok will take this advice.. thank you.
Jonasz thank you too for your input
There are a couple of sites showing tweaks to help alleviate or tame the rear wave issue with this driver. Tidal do something quite radical with their 'diamond' coned version. Not sure what the best solution is but I'll line the inside edge and possibly some v light stuffing in the middle.
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WinISD
Putting three Dayton ES180Ti woofers in one shared 2.5cuft ported volume creates QTc ~0.7 tuning with -F3 ~35Hz (Port Tuned to 35Hz == 4" diameter port, 8.1" long, flared at both ends) green
Putting three Dayton ES180Ti woofers in one shared 4cuft ported volume creates a modest -2db bass shelf with -F3 ~28Hz (Port Tuned to 28Hz == 4" diameter port, 7.8" long, flared at both ends) brown
single ported orange 0.78cuft -F3~35Hz port 2" diameter ~7.4" long
single sealed pink 0.36cuft Qt=0.7 -F3=67Hz
Putting three Dayton ES180Ti woofers in one shared 2.5cuft ported volume creates QTc ~0.7 tuning with -F3 ~35Hz (Port Tuned to 35Hz == 4" diameter port, 8.1" long, flared at both ends) green
Putting three Dayton ES180Ti woofers in one shared 4cuft ported volume creates a modest -2db bass shelf with -F3 ~28Hz (Port Tuned to 28Hz == 4" diameter port, 7.8" long, flared at both ends) brown
single ported orange 0.78cuft -F3~35Hz port 2" diameter ~7.4" long
single sealed pink 0.36cuft Qt=0.7 -F3=67Hz
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Almost finished my work assignment and will start this project next week.
Was giving some thought about sensitivity matching between woofers and accuton. Worried that 3 in parallel wd be too sensitive for the mid. I had an idea, a 'kind of 3.5 way', if it's possible to work.
Keeping the open baffle idea for Accuton and crossing higher as suggested, say 450-500hz. Sticking w/ 3 woofers in parallel altho adding a small inductor in front of lower woofer to roll off highs/add some bsc
More complicated but wd it (potentially)work ok?
Was giving some thought about sensitivity matching between woofers and accuton. Worried that 3 in parallel wd be too sensitive for the mid. I had an idea, a 'kind of 3.5 way', if it's possible to work.
Keeping the open baffle idea for Accuton and crossing higher as suggested, say 450-500hz. Sticking w/ 3 woofers in parallel altho adding a small inductor in front of lower woofer to roll off highs/add some bsc
More complicated but wd it (potentially)work ok?
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