The 2425Js Are SWEET!, but what Horn did I get?

[Robh3606]

I never liked the L200 but liked the L300. I think that top end change had a lot to do with it and certainly points in the direction that that those particular 2 ways really need a UHF driver to make them shine.

Rob

[4313B]

Seems like me and CLIO aren't just makin' this stuff up.

I must have missed a post. What is it you are trying to do or prove?

Don't forget the EQ circuit in the 4331 to produce that bump in response around 8 kHz. I didn't read back in this thread to see if it was mentioned or not.

[Zilch]

I must have missed a post. What is it you are trying to do or prove?

Todd got some 2425Js and some P-Audio horns, and asked me to measure stuff.

Ugliness appeared, reminding me I was in the process of taking a statistical look at LE85/HL91.

I was not real confident in the results. If they are real, then as Rob just observed, they may explain some of what I don't like about the sound of two-ways using that exponential horn.

You're gonna take a look at 2425 on 2307/8 to see if a similar anomaly occurs with them in the next week or so.

[I hope you'll remember that part.... ]

[Robh3606]

Don't forget the EQ circuit in the 4331 to produce that bump in response around 8 kHz. I didn't read back in this thread to see if it was mentioned or not.

I certainly did. Does it use the longer 800hz horn as opposed to the 2307??

Rob

[4313B]

Ugliness appeared, reminding me I was in the process of taking a statistical look at LE85/HL91.

Oh.

I was not real confident in the results. If they are real, as Rob just observed, they may explain some of what I don't like about the sound of two-ways using that exponential horn.

Oh.
You probably could have just had a buddy talk to you through one of them, it would have taken less time.
They're nothing more than a mini-megaphone.

You're gonna take a look at 2425 on 2307/8 to see if a similar anomaly occurs with them in the next week or so.

As explained elsewhere.

[I hope you remember that part.... ]

Right after the 4355's are done. The 4344/4345's are next.

I certainly did. Does it use the longer 800hz horn as opposed to the 2307??

Yes.

[toddalin]

Todd got some 2425Js and some P-Audio horns, and asked me to measure stuff.

Ugliness appeared, reminding me I was in the process of taking a statistical look at LE85/HL91.

I was not real confident in the results. If they are real, then as Rob just observed, they may explain some of what I don't like about the sound of two-ways using that exponential horn.

You're gonna take a look at 2425 on 2307/8 to see if a similar anomaly occurs with them in the next week or so.

[I hope you'll remember that part.... ]

When you measured the P-audio horns, were they on a baffle board and does this seem to have the same effect as the HL-91 (i.e., boost the lower range)?

[Zilch]

When you measured the P-audio horns, were they on a baffle board and does this seem to have the same effect as the HL-91 (i.e., boost the lower range)?

Not baffled, just freestanding.

I doubt it would have nearly the same effect. The way the HL91 lens operates, I can now appreciate that reflections off the baffle would be part of the "system."

http://www.lansingheritage.org/html/...nical/lens.htm

A horn in theory seems more integral and self-contained, but there are almost certainly some baffle effects involved, it being an extension of the mouth. They always sound a bit different when mounted. If these are significant, you should be able to measure them.

Smith horns require lips. Project Array horns want none if it. A design factor....

[Zilch]

4331B:

http://www.jblproservice.com/pdf/Stu...ries/4331B.pdf

The HF bump would appear to derive from the Altec 604-mimicking legacy.

2312 didn't make it automatically like 2307, so it had to be "induced" in 4331?

The earlier 4320 (2307/8) had it (top), and it was featured in 4310 (middle), and 4311/L100 (bottom) et. seq.:

[toddalin]

While re-doing the center channel today I did some comparisons between the P-audio horn and the old style potato masher (the one that is the length of the HL-91) on the LE175.

Rather than high-end extension, I'm looking for low end extension here to fill the gap at the crossover point to the woofer. I found that relative to a 1kHz tone, the, the old masher is about 1-2 dB louder in the critical range between about 600 and 800 Hz (probably due to its longer length). I did find that the masher seems to roll off on the high end a little more (above about 8kHz), but the 075 takes over at about 7,200 Hz, so this is not really an issue.

Guess I'll keep the masher in the center channel and not mess with changing this to the P-audio horn (and save myself some work).

[Zilch]

LE85 on 2312 (HL92,) top two.

Looks like it could benefit from ~2 dB broadband notch in the HF, bottom.

Compare to HL91 (2307) here:

http://audioheritage.org/vbulletin/s...2&postcount=34