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From: Tim S Kemp on 24 Oct 2009 07:46

<Leon(a)nospam.com> wrote in message
news:q3b4e55pd56t706ns9trlou292v1neepat(a)4ax.com...
>
> Right now we have 2 - 18" subs each driven by a 1450 amp in bridge mode.
> The
> spks are 8 ohm so its a pretty good match.

Your a DJ? What are the subs? Sounds underpowered to me, 800w into 2x18.



--
And remember kids, RAID is safe and the UPS never fails, and Cisco routers
never develop intermittent faults, and external hard drives never fail with
only a month's use, and the DNS is reliable and resilient, and the
mailserver is protected from all forms of attack, and the replacement UPS
will be reliable as the first one was an unusual failure. No one will ever
guess /that/ password, the aircon can't fail 285V is close enough to 230,
and the QoS on the PWan won't obstruct the tagged traffic.

From: McSteve on 24 Oct 2009 08:16
"Rupert" wrote:
L...(a)nospam.com wrote:
>> Right now we have 2 - 18" subs each driven by a 1450 amp in bridge mode.
>> The
>> spks are 8 ohm so its a pretty good match.
>> Sound was quite good compared to other DJs that have been unlucky enough
>> to get
>> booked, but with a xover of 150 - 180hz there seemed to be a weird
>> spatial
>> effect with the bass coming from the middle and everything else from the
>> sides.
>>

> Why are you running such a high crossover point? I wouldn't run any
> higher than 120Hz but more likely around 100Hz using a L/R 24dB/octave
> slope.
>
> Lowering the crossover point will help with the boxy, directional
> sound from the subs.
>

Agreed. I'd say your x-over point is much too high. Sub frequencies are
basically
non-directional. If you lower the x-over to a more reasonable number like
100 or less, that 'spatial' effect will pretty much go away. You can
probably
leave the subs right where they normally are. Getting the x-over point set
to
the right freq will cure things.
Also make sure that the high pass filter is engaged on your sub amp. I'm
pretty sure the RMX series has one that's switchable via the DIP switches
on the back. Be sure it's engaged, and set to the frequency that suits your
subs. As I recall, the RMX has options of 30 or 50 hz for the high pass.
You will get more usable power from your amps if they aren't dealing with
frequencies which are too low for the boxes in use. Additionally, if a sub
is fed frequencies that are too low it can lead to over-excursion of the
voice coil, all the while not really making much sound in that low range.

--
Steve <snip> McQ


From: McSteve on 24 Oct 2009 08:28
<Leon(a)nospam.com> wrote:
> Yes, not sure iif he's set to mono or stereo, I'm not the DJ, but
> essentialy,
> yes.
>

Wait a minute...

You said this in your first post:

> Right now we have 2 - 18" subs each driven by a 1450 amp in bridge mode.
> The
> spks are 8 ohm so its a pretty good match.
>

This seems to say that you have two 1450s, and each one is driving 1 box
in bridge mode. Whether the DJ is giving you a mono or stereo feed has
nothing to do with it. All that matters is the configuration of the amp, and
the load it's driving.
Which crossover are you using, and does it have a 'mono sum' output?
If it does, that's what you should be feeding your sub amps with.


--
Steve <snip> McQ


From: Rupert on 24 Oct 2009 12:48
On Oct 24, 4:46 am, "Tim S Kemp" <n...(a)timkemp.karoo.co.uk> wrote:
> <L...(a)nospam.com> wrote in message
>
> news:q3b4e55pd56t706ns9trlou292v1neepat(a)4ax.com...
>
>
>
> > Right now we have 2 - 18" subs each driven by a 1450 amp in bridge mode..
> > The
> > spks are 8 ohm so its a pretty good match.
>
> Your a DJ? What are the subs? Sounds underpowered to me, 800w into 2x18.
>
> --
> And remember kids, RAID is safe and the UPS never fails, and Cisco routers
> never develop intermittent faults, and external hard drives never fail with
> only  a month's use, and the DNS is reliable and resilient, and the
> mailserver is protected from all forms of attack, and the replacement UPS
> will be reliable as the first one was an unusual failure. No one will ever
> guess /that/ password, the aircon can't fail 285V is close enough to 230,
> and the QoS on the PWan won't obstruct the tagged traffic.

I believe they're single 18" subs, so one bridged amp per box @ 8 ohms
which is reasonable for MI grade stuff.

Rupert
From: Leon on 24 Oct 2009 20:28
On Sat, 24 Oct 2009 12:46:45 +0100, "Tim S Kemp" <news(a)timkemp.karoo.co.uk>
wrote:

>
><Leon(a)nospam.com> wrote in message
>news:q3b4e55pd56t706ns9trlou292v1neepat(a)4ax.com...
>>
>> Right now we have 2 - 18" subs each driven by a 1450 amp in bridge mode.
>> The
>> spks are 8 ohm so its a pretty good match.
>
>Your a DJ?

No, my nephew is.

>What are the subs?

18" Eminence custom made.

> Sounds underpowered to me, 800w into 2x18.

Read the post again, each has it's own amp.

Sound great, BTW.

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