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Running the Scan-Speak 15w8530k00 full-range with no x-over
Running the Scan-Speak 15w8530k00 full-range with no x-over
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Old 23rd November 2013, 09:53 PM   #11
chuck55 is offline chuck55  United States
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Quote:
Originally Posted by ultrakaz View Post
Yikes I just typed a response but couldn't post because my "token had expired."
Ultrakaz, Thanks for writing your response up again. I've had that happen too and know how frustrating that can be!
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Old 23rd November 2013, 11:23 PM   #12
chuck55 is offline chuck55  United States
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Ultrakaz, do you think using the ScanSpeak 15W/8530K-01 5" Revelator Woofer in a sealed box would help? It has a higher Qts, smoother looking HF than the -00, and sealed box would limit bass.
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Old 24th November 2013, 04:50 AM   #13
ultrakaz is offline ultrakaz  United States
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I believe the 00 (with sticky coating) has the higher Q and the smoother response. At least according to Zaphaudio.com. However, I have not compared them so I don't know which would sound better running by itself.

Nope, the sealed box would not smooth the breakup of either driver-if that is the question. Nor would a ported box make it worse. Why not try the 00 in a sealed box and see how it sounds as it has the best chance of sounding good? If the breakup bothers you then notch it out. Then if it that does not work turn it into a proper 2-way, just make sure you have enough room at the top of the baffle for the tweeter.
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Old 24th November 2013, 02:50 PM   #14
chuck55 is offline chuck55  United States
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Quote:
Originally Posted by ultrakaz View Post
I believe the 00 (with sticky coating) has the higher Q and the smoother response. At least according to Zaphaudio.com.
Yes, that's what Zaph shows. But I cannot find that Scan-Speak 15W8531K-01 driver on Scan-Speak's website. Scan-Speak only makes:

15W/8530K-00 - Low .27 Qts.
15W/8530K-01 - High .41 Qts.
15W/8531K-00 - Medium .31 Qts / uncoated driver

So I don't know what Zaph is referring to.

I also don't know whose graph is more accurate, but the Scan-Speak graphs in the links provided above show the high Qts, coated, K01 to have the smoothest HF response. Zaph does not compare those in his test.
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Old 24th November 2013, 05:34 PM   #15
midrange is offline midrange  United Kingdom
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Running the Scan-Speak 15w8530k00 full-range with no x-over
Default Running the Scan-Speak 15w8530k00 full-range with no x-over

Quote:
Madisound recommends trying a passive radiator to eliminate the 40hz bump but I like the coherency of a single driver. Wouldn't the P-R be like a separate bass driver and not be in-phase? That is 2 sound sources, not one so there will be sound wave interactions between the two.
That is why I am looking at the Scan-Speak for the flatter bass response - IF you can trust the published curves.
No one seems to have responded to this part of your question. An Auxiliary Bass Radiator(ABR) works the same as a port. The mass of the cone is the equivalent of the air mass in the port (with a much bigger diameter).

So the phase (from the back of the main driver) is reversed, and the output of the ABR is in phase with the driver. For the bass frequencies involved and their wavelength, interference of the outputs of the main unit and the ABR is not an issue.
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Old 24th November 2013, 07:06 PM   #16
chuck55 is offline chuck55  United States
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Thanks Midrange. So is there any advantage of an ABR versus a port? Like noise, vent is out of phase, better LF extension due to a sealed box, higher bass output, etc?
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Old 25th November 2013, 08:24 AM   #17
midrange is offline midrange  United Kingdom
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Running the Scan-Speak 15w8530k00 full-range with no x-over
Hi Chuck. At bass frequencies the ABR effectively behaves as a port. It is not a closed box accoustically at bass frequencies, it is a Helmholtz resonator, just like a port.

One advantages it has is that for the purposes of midrange frequencies it is a closed box. This means that there is no midrange output from it. If you put a microphone (or your ear) near a port you will find that there is some midrange smear coming out of a port.

ABRs were very popular in the 70s, e.g. Kef Cadenza, Kef 104 AB, most large Celestion Ditton speakers. But they have fallen out of favour. Probably cost considerations played a part.

In theory ABRs are better controlled than ports.

The major disadvantage for me is that making one, ( though you can adapt an old drive unit) and particularly adjusting it are really difficult for diyers. A port is straightforward.
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Old 25th November 2013, 08:27 AM   #18
midrange is offline midrange  United Kingdom
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Running the Scan-Speak 15w8530k00 full-range with no x-over
Forgot to mention. The port works by the air in the tube vibrating. This can cause what is called chuffing, which is very descriptive of the noise that can emanate from a port, particularly if the diameter of the port is small. ABRs to not have this issue at all.
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Old 23rd August 2017, 04:14 PM   #19
GringoAudio is offline GringoAudio  Canada
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2" DIA port on this driver is not going to chuff.
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Old 23rd August 2017, 04:20 PM   #20
GringoAudio is offline GringoAudio  Canada
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Chuck where did this project end up?
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