Aiyma A07
I have had both. Very little, if anything between them.
I may have a few opamps left over, to upgrade them.
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I’ve got 2x ZA3 and 2x V3 monos if you want to borrow them?
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Also, this.
I prefered it to the two, above.
I have a couple you can borrow.
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That does appeal as one box one power lead etc, have messaged them to find out where in London they are.
Thank you will see how the Rotel goes first.
Great to hear things are moving along.
Depending on your drivers it’s good to have a higher damping factor amp on the LF drivers.
You can’t beat something like a Crown XLS for that.
I’ve found the 4 X 5" MF drivers easy to power.
I tried various amps but the 5w SET does just as well (hifi volumes).
Would be the same if you use a dual concentric MF/HF comp driver.
The HF is where you want all the finesse, speed and clarity.
Came across this thread today.
Patrick is a long term speaker experimenter and also a Danley fan.
Interesting measurements and discussion.
This would apply to any enclosed MEH…
Excuse the forum cross pollination.
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Don’t know why I didn’t post the drivers in my own thread, anyhow.
So yes 4x these going in B&C 12NDL88 - 12" 700W 8 Ohm
Then it will need 2x these to complete all the drivers for a stereo pair excluding the bass cabs
B&C DCX464 - 1.4" 110W 8 Ohm Coaxial MF & HF Compression Driver
Now the question is, do I put a crossover on the DCX464s to save an amplifier, cables and the rest. That way it would be 3 amps to cover the coaxial, 12inch drivers and bass cabs. Or keep it all in DSP and run four amps.
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So I decided to go the crossover route for the compression driver:
It drops a set of amps and makes life easier. So I started wondering about an amp for this as it won’t be dealing with any bass/low mid frequencies.
Ended up getting a pair of David Wright built EL34 monos trading an old amp I had lying around. Should be a good fit at c. 10w single ended.
Now time to start thinking about what to power the 4x12” with 
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Interesting.
Are you still DSPing between the HF/MF coax and the LF and the sub(s)?
LF power - something with lots of Ws and beefy damping factor🙂
Yes will still be DSPing for so two channels for the speaker and another for whatever I decide to use for the bass.
These are the recommended starting points for the DSP
DSP Settings - Tri-amped
Recommended settings if you are driving each source independently (1 channel for woofers, 1 channel for DCX mid, 1 channel for
DCX high)
The below settings will provide an on axis response that has a slight downward tilt starting above 3k (see page 6). It may be
preferential to tune to a flat preset or one with a different curve depending on your application/taste.
Low Frequency
● Channel Gain: +0dB
● High Pass: 80hz 4th order
● Low Pass: 150hz 2nd order
Mid Frequency
● Channel Gain: -9dB
● High Pass: 370hz 4th order LR
● Low Pass: 3500hz 3rd order BW
● PEQ: 500hz / q3 / +6dB
● PEQ: 1120hz / q3 / +3dB
High Frequency
● Channel Gain: -3.5dB
● High Pass: 3500hz 2nd order BW
● PEQ: 12400hz / q2 / -5dB
Input
● PEQ: 675hz / q1.19 / +2.5dB
DSP Settings - Bi-amped
The below settings are recommended if you are bi-amping via the B&C FB464 passive crossover network.
Low Frequency
● Channel Gain: +0dB
● High Pass: 80hz 4th order
● Low Pass: 160hz 2nd order
● PEQ: 890hz / q2 / +8dB
Mid/High Frequency
● Channel Gain: -4dB
● High Pass: 370hz 4th order LR
● PEQ: 1450hz / q2.2 / -7dB
● PEQ: 2460hz / q5.3 / -8.3dB
● PEQ: 4700hz / q4 / -5.6dB
● PEQ: 5660hz / q7.6 / +6.9dB
● High Shelf: 5500hz / +4.0dB
Input
● PEQ: 1500hz / q0.3 / +3dB
I was tempted being 2 way of getting a plate amp like this
https://www.minidsp.com/products/plate-amplifiers/pwr-ice125
But in the end I want to be able to play around with amps even as appealing as a one box solution is. Plus I have no idea what they sound like so don’t really want to redesign the back plate to fit and then hate them
That’s very comprehensive as a starting point or may be spot on..
As you are hifi volumes / Watts you could try your own 1st order and PEQs brew to see what difference you hear with a more linear phase.
The sky - well 20Hz to 20KHz is the limit🎉
The quite big +dB PEQs they use are interesting on that setup - that’s usually a nono.
That they don’t get clipping at 890Hz with a +8dB on LF.
They have a -4dB on the input to mitigate the +6.9dB plus on the MF/HF..
I’ve not found an amp I like more than the Crown XLS on 12" LFs.
Over the years I’ve had some silly expensive Audiophile power amps here to try too.
They might drive full frequency cat and monkey coffins and make sound🙂 but were shaded by the Proaudio amps in the horn bass range..
The Crown XTI has lots of DSP flexibility, you might never need it though.
Just keep any Crown amp well away from the preamp and other audio gear..
The whole DSP setup is a world I know almost nothing about, plenty of learning ahead.
The Crowns are nice and inexpensive seems a good option. By the time this all gets built I will have 4 different amps kicking around so plenty of chance to play around.
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Yes on the Crown’s.
Having faffed with 5way analogue XOs and spent more on the basic LF ones than on Najda DSP, DSP was a breath of fresh air!
The most expensive Audiophile power amp I had here was £20K retail😂 IIRC.
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Version 2 of the plans are out with new flare modelled with AKABAK and Ath4.
He has also optimised how it is built and simplified the build somewhat JMOD Multiple Entry Horn — JW Sound
Interestingly they also suggest as an option BMS 4594HE as the coax driver which is a driver I looked in to before when thinking of other types of speaker. Anyone got first hand experience of it?
Edit: Already messing around to get rid of the handles and other bits I won’t want/need
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Looks good.
I’ve only had the BMS 4592ND 2" coaxial under test back in the 5 way system days.
It didn’t work well with the Tractrix 200Hz horns I was using back then.
That’s a limitation on the horn not the drivers!
I did buy a pair of BMS 4592ND 2" Mid Range only drivers.
They were great.
On the right horn (a MEH of course🙂) those BMS could be excellent.
Which way are you leaning?
Hard to know without auditioning..
Yeah impossible to say without hearing them which is also likely impossible. Something to think about.
I did speak to the designer about bass integration and the room size etc.
They suggested dual opposed 18inch sealed in a 6 cubic foot enclosure. Not something I would have considered before.
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Not sure if it’s your thing but the ‘We out here’ festival is basically an MEH showcase - every stage, tent, even the stage and DJ monitors were MEH - every shape and size… it was pretty interesting to hear them up close and way back, in tents and open fields. My suspicion as with any speaker was confirmed that bigger is better.
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That could be just 36 inches long x 24 inches wide x 12 inches high.
You can do the sims and see what the response would be.
If drivers were cheaper I might make one for the wedding as extra clump.
One thing I’ve learned, when it comes to kick and nearly everything else, the live music brigade make it sound rightlive!
I’d never have thought ACDC and other heavy/metal stuff could sound so uncompressed.
Something it’s always suffered at the hands of ‘hifi’
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