|
|
Post by Eduardo Wobblechops on Jan 24, 2016 9:58:14 GMT
Yes I'm hoping for good things. Will need another amp though, as it will now be a three way active speaker.
|
|
|
|
Post by Sovereign on Jan 24, 2016 10:35:06 GMT
Not yet John, though I now have some Crysler midrange horns and Isophon horn tweeters to use. About 105db, so very efficient. Will have to back off the gain a bit to match the Alphas, or find some very efficient woofers to use. Do you have a plan to follow or are you going to work out the xovers yourself ? sorry I forgot you run an active system  |
|
|
|
Post by John on Jan 24, 2016 11:05:02 GMT
Yes Ali uses a mini dsp set up
Ali
I imagine you not need a lot of power so maybe use a t amp would work as a start up for a extra amp
|
|
|
|
Post by Eduardo Wobblechops on Jan 24, 2016 12:26:04 GMT
I bought another miniDSP unit, so will have enough channels to do the job. I'll use the Eminence Alphas up to 1k, the mid horns 1k to about 5.5k, then hand over to the tweeters and Tannoy supertweeters. Will use LR 4th order, and adjust xover frequencies by ear, then check with a calibrated mic to check for a decent response. Dead easy to do with the miniDSP units, you can adjust on the fly as you listen.
|
|
|
|
Post by Sovereign on Jan 24, 2016 12:57:14 GMT
That sounds great mate. I already have an active xover I bought from Steve, when I'm on the mend there will be a few amps to build so I can go active
|
|
|
|
Post by Eduardo Wobblechops on Jan 24, 2016 14:55:13 GMT
Good stuff, it's worth trying IMHO.
|
|
|
|
Post by MartinT on Jan 24, 2016 17:57:26 GMT
I think it's a mistake to use low power amps just because your speakers are efficient. There is still an authority that only beefy amps can impart. In my experience.
|
|
|
|
Post by John on Jan 24, 2016 18:22:29 GMT
105db is pretty efficient but I agree headroom is always good
My Speakers are only 96db but the NAD powers them pretty well and it is not the most powerfull amp in the world but I do not feel like I have lack of headroom
|
|
|
|
Post by MartinT on Jan 24, 2016 23:01:53 GMT
It's just that T-Amps lack bass authority, in my opinion, even if the speaker is an easy load. I do have one myself, before anyone asks  |
|
|
|
Post by John on Jan 25, 2016 5:14:46 GMT
Yes agree but Ali has a good amp for bass authority with lots of power and control
I have a few friends that actually mod their Tamps so not to dish out bass and use a separate amp for bass duties It works really well
|
|
|
|
Post by Eduardo Wobblechops on Jan 25, 2016 10:28:36 GMT
Yep, using a Behringer Inuke 3000w jobbie for the bass, works very well IMHO, and has a large damping factor which seems to help with bass detail. Currently using a Monarchy Audio SM-70 Pro for the mid/top end, so will look for another to have the same amp running the mid horns and the other running the tweeters. I've a Bantam Gold I can use in the meantime.
I'd guess the current OB iteration is around 93-95db, I seem to have enough power, though I agree Martin, plenty headroom is a good thing. I don't listen at silly loud levels however.
I'm guessing the mid horn is around 105db, though I know for sure the Isophon tweeters are 102db.
Need to find somewhere local to have the baffles cut with a water jet though, only way to get a clean cut with thick acrylic.
|
|
|
|
Post by Eduardo Wobblechops on Jan 25, 2016 10:36:25 GMT
|
|
|
|
Post by John on Jan 25, 2016 19:11:53 GMT
I often think about going fully active but always ecide to change at the end I would need to add a SPDIF converter for my PC which is another conversion to add a bit more jitter and then would need another Direct digital amp for the tweeters and use something like the Minidsp Nano to keep everything in the digital domain. Maybe one day but just seems like adding extra complexity
|
|
|
|
Post by Eduardo Wobblechops on Jan 25, 2016 21:23:27 GMT
Found a bit more info on the horns. I can run them from 800hz to 5k. Will keep the crossover freqs well away from the critical parts of the spectrum. Will sound very good hopefully.
|
|
|
|
Post by John on Jan 26, 2016 5:00:22 GMT
Yes really hope it works well
|
|
|
|
Post by DarrenHW on Jan 29, 2016 18:04:42 GMT
Did you ever go down this route Darren Ali did you ever change the baffles No I didn't, primarily because the advice I received was the centre and surround channels would at best be compromised by the proposed (and only available) placement. I still intend to investigate OB's but this will have to wait until I move, I've instead continued with the Celestions, I'll spare you the details to avoid drifting the thread or boring you to death  . |
|
|
|
Post by Eduardo Wobblechops on Jan 30, 2016 10:21:32 GMT
Got round to trying the mid horns on my existing OB's last night, an interesting experience. Altered the xovers to 800hz to avoid damage, otherwise just let the horns run up to 20k.
My initial reaction was "meh". No treble info of course, so that didn't help. I think it was also because it was such a different presentation to a cone speaker.
What was more interesting was when I put the OB's back as they were. They now sounded shut in and muddled by comparison, so much so that I checked everything as I thought something was wrong.
I think these will be very good indeed once set up properly.
Must get some sheets of ply and start 'sperrymenting...
|
|
|
|
Post by John on Jan 30, 2016 12:26:47 GMT
Looking forward to hearing this progress
The ply could make a good template for when you cut the sheet
I used 40mm mdf which I found a lot better than 3/4 birch ply
|
|
|
|
Post by Eduardo Wobblechops on Jan 30, 2016 13:27:41 GMT
It's just for experimental purposes, not going to have the acrylic cut until I'm happy with the sound.
I'll find a local firm who can CNC it and polish.
|
|
|
|
Post by ChrisB on Sept 28, 2016 13:22:01 GMT
I was reading about an interesting and perhaps slightly diferent approach to open baffle design which is being employed by a company called Wall of Sound in their Prelude speaker. Multiple small drivers in a very smart baffle. theaudiophileman.com/wall-music/ |
|
.