|
|||||||||||
|
|
||||||||||
|
|
||||||||||
June/july 2004 |
|||||||||||
The horns arrived without damage. I hooked
up a quick 2 way crossover last night and gave them a listen. I need to tweek the crossover a bit and then I will give my impressions. The new
RCA cables fit so tightly that they pulled one of the input grouds right
off my Adcom amplifier when I disconnected them. I will forward the
measurement files for both horns to Giskard and we can start start
tweaking crossover designs. I have an idea for fixing the mounting
baffle for the horns but I have to put that off until Sunday.
|
|||||||||||
I did some more in depth auditioning of the
1500AL and 435Be, as a 2 way with a crossover at 800Hz yesterday
afternoon. They sounded fantastic. The graphs show that the 435Be rolls
off above 13kHz, but I could get more extension by decreasing system
sensitivity. I wish I had a 4430 to compare it to. I have a 2234H and
2426H, but no 2344, maybe someone could fly out with a pair and we could
compare. When I hooked up all the drivers with the modeled the S9800
crossover you could definitely tell when the supertweeter was turned on
and off. There is minimal acoustical difference in the response curves
between the wood and sonoglass horns. I have to run the impedence curves
again though with the new measurement system to see if those are the
same. I will get to that on Sunday morning, but I'll be at work until
then.
|
|||||||||||
New measurements taken at 96kHz sampling
rate allowed me to obtain resolution to 40kHz. Here are some screen
captures of driver measurements. The woofer was measured in the sealed
cabinet with the center 1M above the floor. All measurements were
obtained at 1M on the axis of the driver being measured. The amplifier
and sound card levels were set first to obtain the reference level of
94dB at 1 meter for the 1500AL.
|
|||||||||||