Looking for advice for building cabinet for DLS drivers

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chuyler1

chuyler1

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Joined 2006
#1
I have some car audio speakers that I'd like to use in the home. These were pretty high end back in the day and they've been sitting in my basement for too long not getting used. I recently sourced some passive crossovers from a later model (I sold the original ones). I'm not expecting sonic nirvana, but I want to make sure the time I spend building the cabinets is worth while. If anyone can help me with the design that would be great. The 16 liter enclosure that is recommended is more of a bookshelf. I'd like to see if I could build a tower with dimensions around 36"H x 7-9"W x 12-14"D. I'm open to a transmission line or BLH if this driver will play nice with that sort of setup. The tweeter and mid are sealed back domes so I just have to worry about driver placement on the baffle and the woofer gets the rest of the enclosure to produce some lows.

Any thoughts?

DLS Ultimate Iridium 3 way components
An externally hosted image should be here but it was not working when we last tested it.


Dimensions:
Outer diameter 165 mm / 6,5î
Magnet diameter 85 mm / 3,35î
Mounting depth 65 mm / 2,56î
Mounting hole 140 mm / 5,5î
Nominal power handling 100 W
Maximum power 160 W
Nominal impedance, Z 4 ohms
Sensitivity, 1 W / 1m 89 dB
Frequency response 55-5000 Hz
Fs, resonant frequency 53 Hz
Voice coil diameter 75 mm (3î)
Voice coil height 13 mm /0,5î
Voice coil type / former Aluminium
Voice coil wire Aluminium flat wire
Number of layers 2
DC resistance 3,50 ohm
Voice coil inductance, 1 kHz 0,67 mH
Magnet system Vented hybrid
BL product, BXL 7,16
Max. linear excursion, X max +- 3,5 mm/0,14î
Suspension compliance, CMS 411
Mechanical Q factor, QMS 2,27
Electrical Q factor, QES 0,40
Total Q factor, QTS 0,34
Mechanical resistance, RMS 2,75
Moving mass, MMS 16,6 gr.
Equivalent Cas Air load, VAS 12 liters / 0,434 ft3
Cone / Dome material Non press paper
Recomended enclosures:
Door side: 6 liters, kick panel; 4 liters
Indoor home use: 16 liters with 19 cm 3î port​

The rest of the specs:
http://www.prodej-autohifi.cz/user_...y-dls-iridium-6-3i-www-prodej-autohifi-cz.pdf
 
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#2
Hi,

There is not much point going over 16L with 12L Vas drivers.

For car stuff Qts is unusually low and it suites vented best.

Are your crossover parts the same as in the spec sheet ?
Bizarre way to split the crossover into two parts.
The correct 3 way crossover would still be wrong for home
use as it does not include baffle step compensation.

rgds, sreten.
 
#3
So you think I won't squeeze anything else out of these by going with a larger enclosure, I'm just better off with an empty cavity if I want a floor standing cabinet?

For the crossovers, I don't have the ones outlined in the spec sheet. I have the crossovers for the UR36i model. That link doesn't give the schema. I haven't been able to find it. This model has attenuation for the mid and the tweeter and is a single box instead of two separate boxes.

I don't necessarily have to use these crossovers, but I bought them because it was a quick way to get things up and running. Designing a 4ohm 3 way crossover is a bit over my skill level but I'm open to help in that department. However, cost is a concern since this is just a quick project to mess around with these drivers.
 
#6
xrk971 said:
You could put them in a properly designed tapered TL with critical damping to achieve similar bass extension as a
vented bass reflex but with low group delay similar to a sealed. It has about the right TS parameters to do this.
Click to expand...

Hi,

Please illustrate such a build. I don't believe you can match
a vented box response without entirely similar group delay.

rgds, sreten.
 
#8
Keep in mind that most aftermarket car audio speaker systems (except for subs), are designed for installation in very leaky "enclosures" - doors, rear decks, rear seat side panels, etc - that due to the multiplicity and CSA of venting apertures, and lack of significant fibrous fill I think would likely more closely approximate aperiodic than a BR or TL.

Hence Dave's suggested rather high aspect ratio slot port - something we use a lot, actually
 
#9
sreten said:
Hi,

Please illustrate such a build. I don't believe you can match
a vented box response without entirely similar group delay.

rgds, sreten.
Click to expand...

The PMC inspired TL with the correct amount of stuffing shows lower GD in both sims and measurement compared to regular bass reflex with same extension. It sounds really good and I would not have believed it myself until I built and measured it.

http://www.diyaudio.com/forums/multi-way/281778-low-cost-pmc-inspired-tl-monitor-dc130a-dc28f.html
 
#10
xrk971 said:
The PMC inspired TL with the correct amount of stuffing shows lower GD in both
sims and measurement compared to regular bass reflex with same extension.
It sounds really good and I would not have believed it myself until I built and measured it.
Click to expand...

Hi,

Vented boxes with the same "extension" vary greatly in response.
Simple fact is GD is entirely dependant on the frequency response.

rgds, sreten.
 
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#11
It is true that GD is function of frequency response. However, I have not found it possible (not easily anyhow) to get the same -3dB point with a bass reflex and with the same mild roll off required for a shallow derivative which is the GD. With a TL, I seem to be able to get higher bass output level and a gentle roll off with the correct stuffing in the line.
 
#13
Ok so 7 liters is really small. I don't think I can fit all the components on a baffle that size. The woofer is 165mm, the mid is 120mm, and the tweeter is 45mm. That's without the supplied grills. I think I'm back to the suggested "Indoor home use: 16 liters with 19 cm 3î port" but I don't understand the port measurement. What is 3î ?
 
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