8" subwoofers serving 70-300 hz range

[Mick Miller]

I have a pair of RF P2D4-8's that I would like to use for midbass on a P500.2 amp.

The suggested box sealed is 0.23 ft3 with an F3 of 64hz. The suggested ported box has a much lower F3 at 33Hz and is .65ft3 with 2" diameter by 8" long port.

When going for midbass 70-300Hz range which would be better, sealed or ported? and if so, are there any changes that need to be made for the better setup?

Cheers,

[White Lightning]

Welcome to SMD

Those are sub woofers / drivers ... Not mid bass drivers ...

Find you some mid bass drivers for this application ...

[john253a]

If you already have a sub stage then try to get some proper mid bass

If not seal then in the door and eq the hell out of them

[Mick Miller]

I'll have a dedicated subwoofer stage, two 12's and dedicated amp. For mid-bass am I going to be better suited with a matched pair of speakers, or are there speakers out there made to fit this Hz range? Or am I just going about this all wrong?

[bbeljefe]

Good quality 6.5" or 8" (if you can fit them) midbass drivers in very well deadened doors are the drivers that should be dedicated to midbass duty. The frequency response on the subs you listed falls off at 250 Hz, so they won't be efficient at all as mid bass drivers.

And no, you're going about it right with respect to asking questions before building. :-)

[kingsuv]

I would caution when peoples 1st comment in a thread is it will never work without giving a complete explanation. it's frustrating to see comments without reasons backing up the response.

RF P2's can absolutely work to fill the gap between the subs and midrange. You might have to mess with your crossover points to get a nice blend in the range. Your most difficult challenges will be fitment and rattles. Once you get them to fit, you will spend a good amount of time working out window and panel rattles. Both of which can be addressed with a little work . I have run the subs both sealed and IB. I prefer the sealed option better. Little tighter in the lower end punch for my taste.

[Smoove]

I would caution when peoples 1st comment in a thread is it will never work without giving a complete explanation. it's frustrating to see comments without reasons backing up the response.

RF P2's can absolutely work to fill the gap between the subs and midrange. You might have to mess with your crossover points to get a nice blend in the range. Your most difficult challenges will be fitment and rattles. Once you get them to fit, you will spend a good amount of time working out window and panel rattles. Both of which can be addressed with a little work . I have run the subs both sealed and IB. I prefer the sealed option better. Little tighter in the lower end punch for my taste.

Love that door.

I am going to be running RF P2D4 8's as a midbass in a sealed box. So I say do it if you can get it crossed over properly as kingsuv stated. The punch 500.2 is a great match for a pair of P2 8's. As stated, really are subwoofers and not midbass, i have a pair in a box right now tuned to 35 and they get down. You have to make them work for your application.

[Mick Miller]

For the sub bass end I have a DD audio S2B and pre-ordered the stereo integrity BM mkIV for the subwoofers.

It wouldn't be a problem for me to sell the RF 8's and pick up some proper midbass because my build is aiming for SQ and aesthetics. It looks like I'm getting solid advice here, I can stick with the RF 8s because I have plenty of room behind them in the door with no moving parts in the way to build a sealed box (would this remove rattles?). OR I can sell/trade them somewhere and replace with a proper 3 way system or build my own 3-way system to bring the directional mid-bass up front.

I should have done some more research on the subs, my local RF dealer said they'd be a perfect drop in replacement for the stock speaker for mid-bass, they were demo subs and I got a great deal on them. ^Smoove, those subs in the door look VERY good though.

So basically, can the RF P2 8's work really well as SQ up to the mid range driver frequencies, or should I be looking out for something else due to the complicated mess of EQ it would require?

[Smoove]

Let start by asking a simple question, are you looking for SQ as in "sounds good to you or competition"? Are you going to run an active processor? And how much power are you planning on running to the 8's?

With the right tuning and either of the following options is gonna work. One may be harder to tune than the other depending on location and enclosure size.

P2 8 250rms

Frequency response: 43-250 Hz

PPS8-8 125rms

Frequency response: 80Hz-5kHz

[Mick Miller]

I'll have a P500.2 running the mid bass (P2 8's).

I'm going for SQ for me, not competition. If they'll get the job done that's all I really needed to know.

As far as making them sound the best, I've got a low pass filter on the P500.2 that can be set as high as 500Hz. Should I fiberglass an enclosure for them or keep them freeair and turn the power down?