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by Brian Steele
July 31st, 2020, 5:09 pm
Forum: I.C.E. / Car Audio Tech
Topic: Aperiodic Enclosure, anyone tried it?
Replies: 52
Views: 7579

Re: Aperiodic Enclosure, anyone tried it?

V3 has detachable leads (and USB cable), a built-in resistor for re-calibration purposes, and can do measurements at different voltage levels. It's built more like a lab device. It's a nice piece of kit, but if you've got a working V2, I'm not sure it's worth the cost of the upgrade, unless you real...
by Brian Steele
July 26th, 2020, 5:32 pm
Forum: I.C.E. / Car Audio Tech
Topic: Aperiodic Enclosure, anyone tried it?
Replies: 52
Views: 7579

Re: Aperiodic Enclosure, anyone tried it?

If you really want to try something different, have a look at passively-assisted sealed alignments. Basically you take a sealed Q~1.0 enclosure and put a good deal of capacitance in series with it. End result is a frequency response that's close to vented, without the vent. Box is small though, so y...
by Brian Steele
July 22nd, 2020, 12:48 am
Forum: I.C.E. / Car Audio Tech
Topic: Aperiodic Enclosure, anyone tried it?
Replies: 52
Views: 7579

Re: Aperiodic Enclosure, anyone tried it?

I think to get the best results, you may need to tune the "vent" to the Fb of the driver in the box (sealed), and then stuff the vent until the impedance curve is as flat as possible. Or something like that. Easier to do with DATS or an impedance measuring jig that you can use with REW. Oh...
by Brian Steele
June 19th, 2020, 8:10 pm
Forum: I.C.E. / Car Audio Tech
Topic: Got Tweeters ? ....
Replies: 3
Views: 1302

Re: Got Tweeters ? ....

Not only the amount, but the type too...
by Brian Steele
May 20th, 2020, 12:34 am
Forum: I.C.E. / Car Audio Tech
Topic: JL XD 700/5 Sub Channel?
Replies: 27
Views: 2744

Re: JL XD 700/5 Sub Channel?

Five things matter with the choice of an electrical x-over point: 1. Frequency (e.g. 60 Hz) 2. Slope (commonly 6,12, 18 or 24dB/octave) 3. X-over relative gain (in dB) 4. Relative phase 5. Delay (usually in ms, though it can be quoted in terms of distance, e.g. "cm") Five things will influ...
by Brian Steele
January 30th, 2020, 12:30 am
Forum: I.C.E. / Car Audio Tech
Topic: Frequency response graph
Replies: 56
Views: 8567

Re: Frequency response graph

Putting a 2.2uF condensor on a 4 ohm tweeter gives you a useable freq range from 10khz above That might be the electrical x-over point. The acoustic x-over point might be a bit lower. Case in point - my Blastorama build. The tweeter section has an electrical filter that's around 11kHz. However the ...
by Brian Steele
January 29th, 2020, 5:20 pm
Forum: I.C.E. / Car Audio Tech
Topic: Frequency response graph
Replies: 56
Views: 8567

Re: Frequency response graph

Flat is best to hear how the musician and producer intended you to hear it Not necessarily. Go to any live performance by a musician and record it. Compare it to the version you have on CD. It will sound entirely different. Now, which is the version that the musician wanted you to hear? :-) In-car,...
by Brian Steele
January 29th, 2020, 4:55 pm
Forum: I.C.E. / Car Audio Tech
Topic: Frequency response graph
Replies: 56
Views: 8567

Re: Frequency response graph

or the silver flutes you can get from madisound. I've used the SF drivers from Madisound. They're pretty good for the price. The t/s parameters can vary a bit though, but that might not make much difference if you're planning to door-mount them. If you're willing to spend a little extra though, I'd...
by Brian Steele
January 5th, 2020, 1:48 am
Forum: I.C.E. / Car Audio Tech
Topic: Subwoofer advise needed...
Replies: 67
Views: 12356

Re: Subwoofer advise needed...

I may have missed it but is this the same suv you had? Have you done any electrical upgrades to accommodate the 1.2kW? None at all. Not even a "Big 3" upgrade. At my normal playback levels there's no real pull on the stock system. I can get the lights to dim a little if I REALLY turn it u...
by Brian Steele
January 4th, 2020, 1:17 am
Forum: I.C.E. / Car Audio Tech
Topic: Subwoofer advise needed...
Replies: 67
Views: 12356

Re: Subwoofer advise needed...

Brian Steele of the availability of subs locally and the ones I listed which would be the best in your opinion That's a toughie. I tend not to go by brand name but by technical specs, the more detailed the better. I purchased my current Alpine Type Rs on the basis of their Klippel results, supplied...
by Brian Steele
January 4th, 2020, 12:35 am
Forum: I.C.E. / Car Audio Tech
Topic: Subwoofer advise needed...
Replies: 67
Views: 12356

Re: Subwoofer advise needed...

(duplicate post)
by Brian Steele
January 4th, 2020, 12:33 am
Forum: I.C.E. / Car Audio Tech
Topic: Subwoofer advise needed...
Replies: 67
Views: 12356

Re: Subwoofer advise needed...

i used to run sealed enclosures alot long time & my advice [even though u say u want complimentary bass] is to get more than u think u need since sealed output is generally considerably lower than a ported . so if u think u need 150 go 300 if u need 300 go 500-600ish etc , doesnt mean u need to...
by Brian Steele
January 4th, 2020, 12:27 am
Forum: I.C.E. / Car Audio Tech
Topic: Subwoofer advise needed...
Replies: 67
Views: 12356

Re: Subwoofer advise needed...

Doesn't take up much space and with enough power provides all the SPL that I want. I forgot one more thing - it allows me to carry other stuff in my car's trunk :-). 20170915-carsub1.jpg The two 12s are actually mounted below all that crap in that image, in a fiberglass enclosure built into the car...
by Brian Steele
January 3rd, 2020, 9:31 pm
Forum: I.C.E. / Car Audio Tech
Topic: Subwoofer advise needed...
Replies: 67
Views: 12356

Re: Subwoofer advise needed...

But how is the output? Efficiency at low frequencies is largely a function of box size and "order", and peak SPL at those frequencies a function of the driver's linear excursion potential. A 12" driver with 12~14mm Xmax in a 0.5 cu.ft. box is not going to knock down any buildings, bu...
by Brian Steele
January 3rd, 2020, 2:11 am
Forum: I.C.E. / Car Audio Tech
Topic: Subwoofer advise needed...
Replies: 67
Views: 12356

Re: Subwoofer advise needed...

After trying all sorts of different designs in my cars, I've ended up coming back to simple sealed boxes for subwoofer duty. The boxes are smaller (small vented boxes end up either being tuned too high, or compromised because the vent is too small, resulting in the box's output audibly changing at h...
by Brian Steele
November 1st, 2019, 2:43 am
Forum: I.C.E. / Car Audio Tech
Topic: what is a "best bang for your buck" 6.5 speaker?
Replies: 36
Views: 12251

Re: what is a "best bang for your buck" 6.5 speaker?

Just a question: do any of you use REW or something similar to track down the resonances in the door and deal with them specifically, or do you just "brute force" the install and try to damp everything?
by Brian Steele
July 14th, 2019, 2:54 pm
Forum: I.C.E. / Car Audio Tech
Topic: DSP, Digital Signal Processors (AC,JL,RF)
Replies: 11
Views: 4992

Re: DSP, Digital Signal Processors (AC,JL,RF)

The DM-RTA does look an interesting piece of kit.
by Brian Steele
July 11th, 2019, 5:13 pm
Forum: I.C.E. / Car Audio Tech
Topic: DSP, Digital Signal Processors (AC,JL,RF)
Replies: 11
Views: 4992

Re: DSP, Digital Signal Processors (AC,JL,RF)

As previously mentioned, the Dayton DSP408 is great for its price. And they also come with a 12V PSU so can be used outside of car audio too (I just implemented one in my brother's bar). The only things that would make it better would be support for six inputs instead of four, and support for dynami...
by Brian Steele
June 29th, 2019, 7:44 am
Forum: I.C.E. / Car Audio Tech
Topic: Planning a budget sq build
Replies: 40
Views: 11883

Re: Planning a budget sq build

How did you chose the angle for mounting those drivers? Did you do mock-up enclosures for them and listen to them first in-car? Those Dayton tweeters are fairly large - which in turn means that their high-frequency response will drop off faster as you listen further off-axis. I like the Dayton stuff...
by Brian Steele
May 2nd, 2019, 9:14 pm
Forum: I.C.E. / Car Audio Tech
Topic: Hmm Stereo Integrity
Replies: 11
Views: 4279

Re: Hmm Stereo Integrity

That oneIMG-20190501-WA0001.jpeg Nice specs. Reminds me of the Alpine Type R series, but with a higher Q (that's a by-product of the design of the gap) and higher Xmax. Sealed box, magnet-out perhaps is what I'd do with them. I'm curious however if Adire did anything in them to control inductance...
by Brian Steele
May 1st, 2019, 7:14 pm
Forum: I.C.E. / Car Audio Tech
Topic: Hmm Stereo Integrity
Replies: 11
Views: 4279

Re: Hmm Stereo Integrity

Very few ppl will spend $ for it I hav a couple brahma subs from adire audio selling for a fraction of the price and still no one buys That's the problem with these "boutique subs". Initial cost is pretty high due, and no brand recognition/trust = low resale price. Which Brahma subs do yo...
by Brian Steele
April 16th, 2019, 9:54 am
Forum: I.C.E. / Car Audio Tech
Topic: what is a "best bang for your buck" 6.5 speaker?
Replies: 36
Views: 12251

Re: what is a "best bang for your buck" 6.5 speaker?

I've used the Silver-Flute 6.5s and I'm now using Dayton Audio RS170s. The latter is basically a 6.5" driver with a wider mounting flange. Both are great for the price, particularly if you're going to use them in an active system crossed over at 2.5kHz. For my car, below about 160 Hz or so the ...
by Brian Steele
March 5th, 2019, 6:38 pm
Forum: I.C.E. / Car Audio Tech
Topic: Strange loss of bass
Replies: 29
Views: 6269

Re: Strange loss of bass

It was kicks when my cousin who had 1 10" on a boss 750 with 4 gauge wire, stock alt and ah single small water battery sounded the same as me when i had the 712 on the powerbass 1500.1 with my electrical upgraded. Going from a 750W amp to a 1500W amp adds only 3dB of output - something that ca...
by Brian Steele
March 5th, 2019, 6:25 pm
Forum: I.C.E. / Car Audio Tech
Topic: Strange loss of bass
Replies: 29
Views: 6269

Re: Strange loss of bass

you may need to stop those leaks (some metal sheeting work required ) and dynamat the trunk 7UjClvem2-0 Alas, no before & after measurements to show show successful all of that work was to improve the sound in the vehicle. That's one of the main reasons why I find it difficult at times to take ...
by Brian Steele
February 16th, 2019, 9:09 am
Forum: I.C.E. / Car Audio Tech
Topic: passive crossover question.
Replies: 5
Views: 2639

Re: passive crossover question.

Car audio passive x-overs tend to be fairly generic. Check to see if the values of the components in type X passive x-over are the same in the one that you want to replace. If they're the same, then there shouldn't be a problem swapping them.
by Brian Steele
December 17th, 2018, 9:59 am
Forum: I.C.E. / Car Audio Tech
Topic: Pvc board
Replies: 11
Views: 3425

Re: Pvc board

For an alternative, look for "Starboard" at shop that deals with boat repairs, etc. Expensive, no glue will hold on it, but you can get it in various thicknesses. I'm about to use a piece to redo the wooden speaker adapters I have in my car. Let's just say that, even with a few coats of pa...
by Brian Steele
December 12th, 2018, 11:53 pm
Forum: I.C.E. / Car Audio Tech
Topic: Amp tripping issues
Replies: 13
Views: 2374

Re: Amp tripping issues

Amps trip when the current flow is too high, which suggests that something is shorting somewhere when the speaker is fed more power.

WAG: Check the tinsel leads connecting the terminals to the voice coils, to see if they're too close to each other (if they touch, they will short).
by Brian Steele
December 12th, 2018, 11:43 pm
Forum: I.C.E. / Car Audio Tech
Topic: Anyone using condensers?
Replies: 9
Views: 2056

Re: Anyone using condensers?

A "condenser", or capacitor as it's more commonly known, is a theoretical 6dB/octave highpass filter - the higher its value, the more low frequencies get through. Thing is, speakers do not have a flat impedance, so the response curve you end up with might be quite different to what you exp...
by Brian Steele
November 20th, 2018, 10:22 pm
Forum: I.C.E. / Car Audio Tech
Topic: Subwoofer for small space?
Replies: 37
Views: 5866

Re: Subwoofer for small space?

0.5xPi wouldn't be the space in this application? Some people use 0.5PI modelling to get an idea of what the in-car SPL might be like. I prefer to stick to 2PI @ 2.83V for most of the models, for easy comparison with other modeling programs. As you can see below, switching to 0.5PI does not really ...
by Brian Steele
November 20th, 2018, 10:18 pm
Forum: I.C.E. / Car Audio Tech
Topic: Subwoofer for small space?
Replies: 37
Views: 5866

Re: Subwoofer for small space?

https://www.parts-express.com/dayton-au ... r--295-463

Should work quite well in a 0.6 cu.ft. sealed box. Well, you won't be knocking down any buildings with it, but predicted response curve looks nice for a car audio box...

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