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Old 28th February 2007, 12:14 AM   #11
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Looking forward to it Joe!

for the port..i'm going to try this small one and see how it sounds. if it sounds funny i'll just make the hole bigger and use the port outta my old speakers. they are a decent size. not exactly sure what the measurements are off the top of my head.

i went and purchased my polyfill today. i'm hoping my boxes will be done by next week.

i'm using a Behringer A500 power amp, being fed by my Harman/Kardon AVR330 receiver. I beleive the amp is rated for 160watts at 8ohms. How do you figure they will sound? i know you said i don't need a sub but i already have a 15"
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Old 28th February 2007, 02:00 AM   #12
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sorry that's 160watts x 2 at 8ohms. if i get a second and bridge them i will have 500watts a side.
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Old 1st March 2007, 07:14 AM   #13
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Default Elsinore Tweeter Distortion Tests

Elsinore Tweeter Distortion Tests

So far three Tweeters have been tried in the Elsinore speakers. It started with Vifa XT25 and became the basis for Elsinore Mk1. There were concerns however as this is a 4 Ohm Tweeter and rated at 91dB. As the Elsinores are very sensitive and the main driver array is 8 Ohm, there will be little padding down of the XT25 tweeter to raise Z. In the final result it gets as low as 3 Ohm.

Then Vifa DX25 was tried. As this is also 4 Ohm but rated at 93.5dB, it was thought this might bring the in-system Z up (more padding), but in reality it was not that much of an improvement.

Sound wise I even felt that it was better than XT25. It doesn't die as much off axis as XT25, it is cheaper and just a little better sonically IMO.

Then it became a serious search for an 8 Ohm tweeter. I realised that the new Peerless HDS was 8 Ohm and also 93dB rated. Like others, I came across Zaph Audio's acclaim and his tests were indicating that it was better than Seas Millenium on the basis of those tests.

Once the HDS was integrated (took a couple of weeks) and just as hoped for, the 8 Ohm system Z was attained. But more than that, this is a superior tweeter sound wise, no doubt about that.

So how do the test?

The following graphs use colours to identify which tweeter, so:

XT25 is RED

DX25 is GREEN

HDS is BLUE


Let's start with THD Graphs 1KHz

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

CONCLUSION: This is a fairly difficult test, but appropriate as the tweeter we are seeking needs to have good bandwidth and the XT25 with low Fs=500Hz you would think would be the winner. NO! The HDS is easily the winner.

Joe R.
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Old 1st March 2007, 07:23 AM   #14
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Default [b]THD Graphs 2KHz[/b]

THD Graphs 2KHz

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

CONCLUSION: This is a less, yet still difficult, test as this a low order crossing over around 3KHz. Again the HDS is easily the winner.

Joe R.
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Old 1st March 2007, 07:35 AM   #15
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IMD Graphs 1KHz

These are Inter-Modulation tests.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

CONCLUSION: Again the HDS is the winner by a handsome margin.

Joe R.
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Old 1st March 2007, 07:59 AM   #16
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THD versus Frequency Graphs

XT25RED

Click the image to open in full size.

DX25

Click the image to open in full size.

HDS

Click the image to open in full size.

Please note that these are referenced measurements, so in dB terms you can actually calculate the THD at any frequency in percentage terms.

CONCLUSION: The HDS is the winner.

Joe R.
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Old 1st March 2007, 08:16 AM   #17
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Individual Harmonic versus Frequency Graphs

XT25

Click the image to open in full size.

DX25

Click the image to open in full size.

HDS

Click the image to open in full size.

Please note that these are referenced measurements, so in dB terms you can actually calculate the individual harmonic distortion at any frequency in percentage terms. Just use the usual 20Log type calculations.

CONCLUSION: No surprise, the HDS is clearly the winner.

OK. There you have it. I invite any comments on the above. What is quite sure in my mind, the HDS is a class above the other two and the cheaper DX would be my choice over the XT. The overall pattern is consistent through all the tests and the ranking obvious.


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Old 1st March 2007, 08:26 AM   #18
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Please note:

In post #415, the header IMD Graphs 1KHz should have read just IMD Graphs
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Old 1st March 2007, 08:57 AM   #19
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Thanks for publishing your findings Joe. They correlate very well with Zaph's, which is always reassuring.

The 810921 sure looks like a winner, across the board.

Although the low end of the XT25 leaves a little to be desired, above 3Khz it looks cleaner than the DX25. The limited dispersion can be an advantage, or disadvantage, depending on your design goals.

Have you run similar comparisons with the Peerless midwoofers? eg. HDS vs Nomex, vs PPB?


regards,
Thanh.

PS. The new Altronics catalogue is showing a tasty new 1" dome tweeter waveguide...

http://202.89.176.201/page/68.pdf
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Old 1st March 2007, 09:11 AM   #20
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Joe R. I was wondering if you could share a bit of info on your test setup. Things like mic distance, baffle qualities, room treatment (if any). I've started doing my own HD measurements and I'm trying to develop a good method and environment so i trust my results.
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