|
HD15 pics (and others..) now with plots |
Post Reply 
|
Page <123> |
| Author | |
ceharden 
The 10,000 Points Club 
Joined: 05 June 2005 Location: Southampton Status: Offline Points: 11851 |
 Post Options
 Thanks(0)
 Quote Reply
 Posted: 28 July 2005 at 12:56pm |
|
Norty,
I'm curious about the Beyma 2x18 BP6 cab, have seen plans for it but not much info on it's specs. Do you use the recommended Beyma drivers or something else? How does it compare to an X1? Also, slightly off topic, how low can you sensibly run the HD15's before risking overexcursion of the driver? I've been trying to work it out from simulation but that seems to suggest the excursion gets excessive below about 60-70Hz. Reason for asking is I'm due to build some with some old Kappa15LF's I've got lying around but it might be a while til I can build something to go below them. Cheers.. |
|
 |
|
|
Dom
Old Croc 
Joined: 25 February 2004 Location: United Kingdom Status: Offline Points: 1700 |
Post Options
Thanks(0)
Quote Reply
Posted: 28 July 2005 at 2:04pm |
|
We used to high pass ours at 45hz without any problems. Lost 3 drivers in 3 years of getting run very hard every weekend.
|
|
|
"It sounded like a million fire engines chasing ten million ambulances through a war zone and it was played at a volume that made the empty chair beside me bleed."
|
|
|
|
|
norty303
Old Croc
Joined: 18 August 2004 Location: Eastbourne Status: Offline Points: 8800 |
Post Options
Thanks(0)
Quote Reply
Posted: 28 July 2005 at 4:26pm |
|
Its hard to say how it compares to an X1 as i've never run it back to back with one. Dave modelled the cab in Acabak and i did it in Bassboxpro and we came out with fairly similar results, although Dave's curve rolled off a little higher and played a little higher. It starts to roll of in the model around 70hz but it plays right up to 160 or so and still sounds ok, i've run it at 120hz and its been fine and very loud in that situation. Both the models showed it had high sensitivity (106-108) so i'd be really interested in actually measuring it - when was that next sub shootout?? I was talking to Dom at Glade and we came to the conclusion its much more a bass bin than a sub and would be great under X15's if you don't need to go really low. It does make noise down there tho, but i'm not going to make any claims until its actually been measured.
|
|
|
My laser stuff: Frikkin Lasers
|
|
|
|
|
ceharden
The 10,000 Points Club
Joined: 05 June 2005 Location: Southampton Status: Offline Points: 11851 |
Post Options
Thanks(0)
Quote Reply
Posted: 28 July 2005 at 6:11pm |
|
Cheers for the replies. Sounds like I'll be ok running just HD15's for most things that don't require a lot of sub.
From that graph the Beyma cab isn't an equivelent to the X1 as I first thought; the X1 is definitely a sub. I was thinking that you ran them under the HD15's as Dom does with the X1 but I assume not now from seeing the response. Wonder what a 15" version would be like (just cos I've got a load of 15" drivers doing nothing but no 18"s and no money to buy new drivers) |
|
|
|
|
norty303
Old Croc
Joined: 18 August 2004 Location: Eastbourne Status: Offline Points: 8800 |
Post Options
Thanks(0)
Quote Reply
Posted: 28 July 2005 at 6:36pm |
|
Yeah, i do run them under the HD15's, just like Dom does with his X1's however they're never going to go as low, rear chamber volume alone prevents that. I run them 40-80hz with HD15's and they do make noise still, just not as loud as the X1's i suspect. As i said, those are just models, they may well perform batter as we're still not entirely sure of the correct way to model manifold enclosures or the gains from that configuration. Thats why we won't know until its measured. I like them because they are versatile (as is my whole rig) and i can mix and match depending on size needed for each gig without losing out in any one area through not having a type of cab there. E.g. X15's and bp6 are still very useable on smaller gigs without missing the punch of the HD15's.
|
|
|
My laser stuff: Frikkin Lasers
|
|
|
|
|
Dom
Old Croc
Joined: 25 February 2004 Location: United Kingdom Status: Offline Points: 1700 |
Post Options
Thanks(0)
Quote Reply
Posted: 28 July 2005 at 6:52pm |
|
Must say I'm well impressed with the X1s... Did a couple of small gigs last weekend with just a pair of X1s and a pair of full range boxes, sounding really nice... At some point you're going to have to get round to measuring the response of those Beyma cabs and answer the question once and for all... |
|
|
"It sounded like a million fire engines chasing ten million ambulances through a war zone and it was played at a volume that made the empty chair beside me bleed."
|
|
|
|
|
ceharden
The 10,000 Points Club
Joined: 05 June 2005 Location: Southampton Status: Offline Points: 11851 |
Post Options
Thanks(0)
Quote Reply
Posted: 28 July 2005 at 7:04pm |
|
I'd be interested to see some measured plots when you get
a chance. Been wondering about manifold loading too cos there are
a few designs around which use similar configurations. They're
kinda half way between a reflex and a BP6. I'm still trying to
get sensible results modelling the HD15, haven't yet managed to quite
recreate Rog's plot on the plans page.
Although I've had bad experiences with BP6 boxes (EV SB181 etc), despite the size I'm quite tempted by the X1, esp for the D'n'B gigs I can't seem to get out of doing. Edited by ceharden |
|
|
|
|
norty303
Old Croc
Joined: 18 August 2004 Location: Eastbourne Status: Offline Points: 8800 |
Post Options
Thanks(0)
Quote Reply
Posted: 01 August 2005 at 7:48am |
|
OK, thought i'd make some use of a day off and actually measure some things. Some details of the environment - Using SpectraRTA to do swept logarithmic sine waves 20-250hz, measured using an ECM8000 @ 1m using moderate input levels (neighbours!) and done indoors in my front room which is so full of junk it's fairly acoustically dead. The resolution is 1/24 octave and smoothing/averaging switched off. First up is the HD15 loaded with PD154
Followed by the Beyma BP6 box
The Beyma box was fairly close to what the model said, perhaps a little lower but that could be the room. The HD15's seem to go as low as the subs but i can still get better volume out of the thing as a whole if i cut the HD15's at ~75hz and let the subs take some of the work. Interesting to see the hole at 100hz that Dom saw too when he measured |
|
|
My laser stuff: Frikkin Lasers
|
|
|
|
|
norty303
Old Croc
Joined: 18 August 2004 Location: Eastbourne Status: Offline Points: 8800 |
Post Options
Thanks(0)
Quote Reply
Posted: 01 August 2005 at 8:08am |
|
Oh, one more thing, the Beyma plot was done with my new box, the drivers have got zero hours on them so they might free up a bit and change the resp. Have to try again once they've been run a bit but unfortunately the other box has brand new recones so i've not got any run in drivers
|
|
|
My laser stuff: Frikkin Lasers
|
|
|
|
|
Dom
Old Croc
Joined: 25 February 2004 Location: United Kingdom Status: Offline Points: 1700 |
Post Options
Thanks(0)
Quote Reply
Posted: 01 August 2005 at 3:19pm |
|
Considering the dip is below 100 on your plot and around 125 on our plot I'd be tempted to put it down to room interference on your part and sheep interference on ours.. The test is to move the microphone and see if the holes and peaks move around too.... |
|
|
"It sounded like a million fire engines chasing ten million ambulances through a war zone and it was played at a volume that made the empty chair beside me bleed."
|
|
|
|
|
tb_mike
Old Croc
Joined: 01 October 2004 Location: New Zealand Status: Offline Points: 2744 |
Post Options
Thanks(0)
Quote Reply
Posted: 01 August 2005 at 7:33pm |
 no outside measurements? what if my room isnt the same size as yours!
|
|
|
|
|
norty303
Old Croc
Joined: 18 August 2004 Location: Eastbourne Status: Offline Points: 8800 |
Post Options
Thanks(0)
Quote Reply
Posted: 01 August 2005 at 7:39pm |
|
Hey, i had a hungover day off, live in the town centre and have no generator. It's not easy for people to do outdoor measurements y'know On the other hand i could give you the dimensions and a list of my sh*t and you could build a room to suit. In my situation it's a case of...
|
|
|
My laser stuff: Frikkin Lasers
|
|
|
|
|
Post Reply
|
Page <123> |
| Tweet |
| Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |
Topic Options
The test is to move the microwave and see if the holes and peaks move around too....