And Now For Something REALLY BIG

[freax]

Originally Posted by JRKO

D'OH!!!!! Curse my Mac keyboard!!! I divided instead

yes its 3.26"

lol you should use an Amiga keyboard, thats what NASA used to use: Video: NASA Morpheus moon lander crashes & explodes on test flight - YouTube

I blame the transition to Windows computers.

[einis]

Originally Posted by LafeEric

I have also purchased a pair of D220Ti's but am working on finding the right horn, currently.

probably you have already chosen a horn. but these work good for my 220s.
https://www.parts-express.com/pe/sho...umber=292-2572
smooth compared to earlier cd-horns that have edges in them. and can be crossed pretty low.

[JRKO]

Holy poop!! Your replying now to LafeEric who posted that 553 posts ago???

I'm just guessing but did you read the whole thread before posting randomly

[JRKO]

So I have 2 other parts of the puzzle to collect before I can use the HF144's.

Unfortunately they dont come in cereal boxes thou finding a minidsp in you cherios would be less of a shock than a 8 cell horn

It will be the end of the month before I can raise the £200 for the horns and then a week or two for the minidsp, unless I can lose that in the monthly shop somehow

I am going to need a preamp at some point too but I guess I can make do with the volume control on the minidsp for a while. I'm heading towards a battery powered B1 with board & jfets from Nelson himself.

I think I can power the minidsp from a battery as well. I wonder what the benefits would be? Other than the obvious - getting it of the crappy circuits in my block and one less mains socket needed!!

[GM]

Originally Posted by einis

https://www.parts-express.com/pe/sho...umber=292-2572

Hmm, its mouth transition is much too abrupt. Adding a foam lip ALA Peavy's Quadratic Throat WG patent is a good plan. That, or a foam insert after Dr. Geddes's patent.

GM

[GM]

Originally Posted by JRKO

a 8 cell horn

Which one?

If your mains power is as bad as mine, battery power is de-riguer for HIFI/HT apps if you don't have a power conditioner. Worse is all the shielding required in my locale. 'Customer no service' AT&T's crappy DSL modem can't hardly function without shielding and even then, their line filtering leaves something to be desired if I understand correctly how this system works.

GM

[JRKO]

This one 8 Cell Multicell Horns for JBL,Beyma,Altec, | eBay

Would value your input on this one GM


As for power, I am thinking of using the ACA (5w class A) for the HF144's and for midbass a Hifimediy T1 (100W into 8ohms ) both of which I can power with SLA's!!

I thought Ideally I could get my entire system from preamp upwards of grid and just have the sources on the mains.

[GM]

Hmm, larger than an 808, smaller than an 805, so guess it's designed for the 20-20 kHz BW's mean equal power point = ~632 Hz XO.

The throats don't come to as sharp a point as the tin 'can' horns, so HF response won't be quite as smooth/extended, but overall looks like a good bang/buck product.

Sure wish I had the patience! I wonder how much a [12] cell would be to get down to 500 Hz [1205].

GM

[JRKO]

is the 632hx the cut off for this multicell so I should crossover higher, say 750hz?

the guy also makes a 15 Cell version. We noted some odd details in the throats pics. From the builder - 'Because of the widening of the of the entrance it keeps all the 15 appertures the same area never thought about it before" & "yes the cells are slightly shorter on the outside banks but the throats make up the differance by being longer on the outside edges"

[JRKO]

Originally Posted by GM

The throats don't come to as sharp a point as the tin 'can' horns, so HF response won't be quite as smooth/extended, but overall looks like a good bang/buck product.

GM

Just to clarify, do you mean small end or the large end of the cells are not as sharp? The guy seems open to small detail changes