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**sonex** · 07-06-2013, 12:30 AM

Re: Introducing The Arias - my Black Box design. RS150-4 + XT25SC90-04

tyger, the parts are on order. I'll let you know how they turn out.

**sonex** · 07-11-2013, 08:38 PM

Re: Introducing The Arias - my Black Box design. RS150-4 + XT25SC90-04

ty, since you determined the postitive post on the tweeter with your omni could you tell me if the positive is the narrow or wide terminal. there is a green line on the wide terminal, am I correct this means its the negative post?

**tyger23** · 07-12-2013, 11:57 AM

Re: Introducing The Arias - my Black Box design. RS150-4 + XT25SC90-04

I believe it was the small terminal = positive. Unfortunately, I can't check right now. I get a new shipment of XT25's in sometime today or Monday, so I can try and measure it again.

If you look in the description of the Madisound page for that tweet, they agree:

Madisound - Page Not Found

http://www.madisoundspeakerstore.com/ring-radiator-tweeters/vifa-xt25sc90-04-ring-radiator-tweeter/

This page has been removed, but Madisound has thousands of loudspeaker parts. Contact us today at [email protected]

**tyger23** · 07-16-2013, 03:39 PM

Re: Introducing The Arias - my Black Box design. RS150-4 + XT25SC90-04

Sonex,

I got my new set of XT25SC90-04 tweets in. Unfortunately, I can't give you a definitive answer. Using the "AAA" battery test, the LARGE terminal presents itself as the positive terminal. However, due to my crossover design, you may want the tweeters in reverse. I apologize - I should have paid better attention to this.

Here's how to determine it, assuming you have some method to measure SPL (a computer, smartphone, radioshack SPL meter, anything). Simply hook up the speakers and generate a sine wave centered at the crossover frequency (2500Hz). Keep the volume relatively low so you don't blow your eardrums. Without moving the speaker, SPL meter, or any of the volume controls - swap the polarity of the tweeter and re-measure.

The setting with the loudest SPL will be the proper polarity for the speakers.

**sonex** · 07-16-2013, 04:54 PM

Re: Introducing The Arias - my Black Box design. RS150-4 + XT25SC90-04

tyger, how would I generate the 2500 hz frequency, what would the source be? sorry for the question but I'm not familiar with this procedure.

**tyger23** · 07-17-2013, 12:33 AM

Re: Introducing The Arias - my Black Box design. RS150-4 + XT25SC90-04

I assume you can hook up your PC to the amp/speakers. If so, just go here: http://www.youtube.com/watch?v=kbQNtjhYmLs

Do you have a way to measure the SPL? There's several free SPL meters available for smart phones that can be used. Also, on a PC, you can record the playback using "Audacity" and analyze the file to determine the relative SPL.

**sonex** · 07-17-2013, 04:55 PM

Re: Introducing The Arias - my Black Box design. RS150-4 + XT25SC90-04

thank you tyger, I'll give it a shot when the speakers cabs and xo are finished.

**sonex** · 10-31-2013, 01:53 PM

Re: Introducing The Arias - my Black Box design. RS150-4 + XT25SC90-04

tiger,
hope you don't mind me posting this here if you want this deleted I will.

I did the 2500 hz test and battery test to determine correct wiring to the tweeter. The battery test indicated the large terminal as positive. The 2500 hz test indicates the + of the xo goes to the + on the tweeter (large terminal). Hope this helps anyone who plans to build them.
I'll give my impressions of the speakers once I totally finish them in a new thread.

**tyger23** · 10-31-2013, 03:02 PM

Re: Introducing The Arias - my Black Box design. RS150-4 + XT25SC90-04

Sonex,

Thanks for posting the results. I figured that's what it was, but I haven't been able to completely confirm. I've been in progress of building an 8-ohm version of these for some time, but life gets in the way ;).

**DannyG** · 12-15-2013, 12:34 PM

Re: Introducing The Arias - my Black Box design. RS150-4 + XT25SC90-04

Tyger,why did you have to check the polarity on the tweeter?Is there not an indastry standard ditermaning wich side of the voice coil goes to positive?I'd like to build a pair of these they seem like a good low cost build.

**tyger23** · 12-19-2013, 10:45 AM

Re: Introducing The Arias - my Black Box design. RS150-4 + XT25SC90-04

Originally posted by DannyG View Post

Tyger,why did you have to check the polarity on the tweeter?Is there not an indastry standard ditermaning wich side of the voice coil goes to positive?I'd like to build a pair of these they seem like a good low cost build.

Danny,

Sorry for the late response - Christmas stuff has been keeping me busy.

If the tweeter has the polarity reversed (wires swapped coming out of the crossover), then you will experience a severe dip in the frequency response around the crossover frequency. In this design, that's around 2500Hz. So, in order to get the desired frequency response, you want to make sure that the polarity is correct.

When I posted the schematic for the crossover, I forgot to note that the crossover should be connected to the positive terminal of both the tweeter and the woofer. So, simply make sure to connect the crossover's output to the positive terminals of the correct speakers, and all will be good. For the Vifa tweet - the positive terminal is the large terminal.

Some speaker designs require the crossover output to be connected to the tweet's negative output (reverse polarity), but that's not the case in this design.

I hope this helps! I've still stoked about this design every time I hear it. I hope you have success in your build!

**DannyG** · 12-19-2013, 11:54 AM

Re: Introducing The Arias - my Black Box design. RS150-4 + XT25SC90-04

OK Tyger I was a little confused,I thought you were trying to figure out wich terminal was pos.I guess I was reading it wrong.There are two builds I was thinking about arias or hitmakers.Havent dicided yet,wich is the lowest cost will probably win out.thanks for the reply.

**Whitneyville1** · 12-27-2013, 07:05 PM

Re: Introducing The Arias - my Black Box design. RS150-4 + XT25SC90-04

Tyger, I was wondering what an 8 ohm version needs. I know this time of year you're swamped, but an 8 ohm version is what I need. Please keep us informed on your progress. I'm VERY curious how the new RS-150P might work in your design.

**F-Train** · 01-06-2014, 04:51 PM

Re: Introducing The Arias - my Black Box design. RS150-4 + XT25SC90-04

With the Erse 0.22uF Pulse-X 630V cap being on backorder from Erse, am I ok to drop to a 250 or 400V? I assume 630 was chosen because the Pulse-X aren't available in .22 below 630 V.
Thanks- Fenton

**tyger23** · 01-09-2014, 10:39 AM

Re: Introducing The Arias - my Black Box design. RS150-4 + XT25SC90-04

Sorry for the late reply - I was on vacation.

The main thing for that capacitor is the uF value. Anything above about 100V should do nicely, prefer 250V. Don't change the value more than 10% though - so stay between 0.20uF and 0.24uF.

PE carries a few caps that should work nicely:

Home

http://www.parts-express.com/dayton-audio-dmpc-022-022uf-250v-polypropylene-capacitor--027-402

Dayton Audio DMPC-0.22 0.22uF 250V Polypropylene CapacitorMake the Dayton Audio line of metallized polypropylene capacitors your standard choice for all of your loudspeaker projects! The same high quality as the competing brands ... but at a much lower price. They are suitable for a wide range of applications. They are ideal for use in loudspeaker crossover networks, or for by-passing large value non-polarized electrolytics. Also a good choice as coupling capacitors in the signal path of audio power amplifiers and preamplifiers.Specifications: • Value: 0.22 µF • Rated: 250 VDC • Tolerance: ±5% • Dissipation Factor: Max 0.001 (0.1%) @ 1 KHz • Operating Range: -55°C to 105°C • Dielectric Strength: 150% • Insulation Resistance: 10,000 M? x µF • Life Test: 1,000 hours @ 85°C, 150% rated voltage • Dimensions: 7 mm Dia. x 18 mm L.

Home

http://www.parts-express.com/dayton-audio-dffc-022-022uf-400v-by-pass-capacitor--027-454

Dayton Audio DFFC-0.22 0.22uF 400V By-Pass CapacitorThe Dayton Audio film and foil polypropylene capacitors are ideal for bypass use, have low ESR and superior sonic detail. Specifications: • Value: 0.22 µF • Rated: 400 VDC • Tolerance: ±5% • Dissipation Factor: Max 0.001 (0.1%) @ 1 KHz • Operating Range: -55°C to 105°C • Dielectric Strength: 150% • Insulation Resistance: 10,000 M? x µF • Life Test: 1,000 hours @ 85°C, 150% rated voltage • Dimensions: 11 mm Dia. x 35 mm L.

Home

http://www.parts-express.com/dayton-audio-pmpc-022-022uf-250v-precision-audio-capacitor--027-202

Dayton Audio PMPC-0.22 0.22uF 250V Precision Audio CapacitorDayton Audio is once again leading the charge at bringing high quality, high value products to the speaker building community. Their new line of 1% tolerance capacitors gives you the ability to construct high-precision crossovers, which can eliminate "stereo wandering" and solidify the imaging and soundstage of your speaker systems. Commercial manufacturers know of this problem and buy thousands of capacitors so they can hand-match them for their products-- now you can effectively do the same, because every capacitor is matched! These capacitors share the same excellent build quality, long-term reliability, and sonic clarity of the standard Dayton Audio metallized polypropylene capacitors. Well-known in the industry as the brand of choice for use in loudspeaker crossovers, they offer the performance of boutique capacitors at a fraction of the price. Let the excellent reputation of Dayton Audio and their Precision Capacitors help you build the best speakers that you possibly can.Specifications: • Value: 0.22 µF • Rated: 250 VDC • Tolerance: ±1% • Dissipation Factor: Max 0.001 (0.1%) @ 1 KHz • Operating Range: -55°C to 105°C • Dielectric Strength: 150% • Insulation Resistance: 10,000 M? x µF • Life Test: 1,000 hours @ 85°C, 150% rated voltage • Dimensions: 7 mm Dia. x 18 mm L.

Home

http://www.parts-express.com/audyn-cap-q4-022uf-400v-mkp-metalized-polypropylene-foil-crossover-capacitor--027-102

Audyn Cap Q4 0.22uF 400V MKP Metalized Polypropylene Foil Crossover CapacitorAudyn has supplied European speaker builders with high quality electrical components for use in crossovers since 1973. Their Q4 series of non-polarized capacitors feature MKP metalized polypropylene foil and are tightly wound to prevent microphonics. This results in a high voltage rating of 400 VDC and a low loss of 0.0003% @ 1 kHz/20°C. All Q4 capacitors are selected to maintain a 5% tolerance. Made in Germany.Specifications: • Rated: 400 VDC • Tolerance: 5% • Value: 0.22 uF • Dimensions: 10 mm Dia. x 18 mm L • Foil thickness: 8 µm.

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Introducing The Arias - my Black Box design. RS150-4 + XT25SC90-04

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