Can any one share a good design(X/O + enclosure) for a XT25 and 7'' HDS Exclusive?

[AV8ter]

Well..... I have a pair of 7'' Peerless HDS Exclusive 830883 and a pair of Vifa XT25TG30-04 tweeters just sitting here from a retired car audio endeavor.

I am trying to find plans or recommendations for an enclosure for these. I am just looking to make a nice set of monitors. Also looking to run a subwoofer in combination(2.1) so it would be nice if I could keep the monitors relatively compact, but I don't want to skimp on performance.


I have access to the tools to get the job done and even have a limited access to a CNC router if that could open any fabrication possibilities.


Thanks for the help in advance guys,


Kevin

[AV8ter]

Bump. Can anyone shoot me in the right direction? I'm planning to build these cabinets in the next month and want to get a jump on ordering the crossover components.

Thanks guys.

[rabbitz]

These may give you some ideas but not the same woofer.
DIY Loudspeaker Projects Troels Gravesen

You may find a project using the 830875 which is similar in operation to the 830883.

[AV8ter]

Originally Posted by rabbitz

These may give you some ideas but not the same woofer.
DIY Loudspeaker Projects Troels Gravesen

You may find a project using the 830875 which is similar in operation to the 830883.

Thanks. I'll take a look.

[Jay]

Noooo... 830883 is completely different animal than 830875. If 830883 is not common in 2-way, that's probably because the elevated midrange response below 1KHz. Some "inexperienced" may try to use notch filter to level the response. This is dangerous as notch filter below 1KHz will usually kill the dynamic of the woofer.

If you're desperate and in need of "any" crossover that will work with your drivers, I might be able to help. But as this will need quite some effort (tho less than 2 hours) I will do it only if you really want to build it.

[AV8ter]

I thought it would be a rather simple XO design for these drivers. So you are saying the 7'' exclusive is not ideal for a 2-way setup? Any other driver that you would like to recommend in the 50-70 dollar price range?

[Jay]

Originally Posted by AV8ter

I thought it would be a rather simple XO design for these drivers. So you are saying the 7'' exclusive is not ideal for a 2-way setup? Any other driver that you would like to recommend in the 50-70 dollar price range?

No, I didn't say it is not ideal. It has a bit of challenge. May be many have tried but given up. I know XT25 very well. It could be a good match for the woofer in my prediction.

[Jay]

Many very good midwoofers have no publication of implementation on the net, simply because they are difficult to work with. Recently I bought used speaker pairs for $4. The midwoofers are the most well behave driver I have ever known

I believe the Peerless that you have has a quality that has been underestimated by many.

[AV8ter]

Originally Posted by Jay

Many very good midwoofers have no publication of implementation on the net, simply because they are difficult to work with. Recently I bought used speaker pairs for $4. The midwoofers are the most well behave driver I have ever known

I believe the Peerless that you have has a quality that has been underestimated by many.

I love the way these mids sound. I ran them active in my car doors, crossed at 63hz(HPF, LR4) and 2.5khz(LPF, LR2).

Cabinets are cheap and I had the drivers laying around so I figured why not. Just need to figure the crossover situation.

Would it be easier to just use and active xo(minidsp)?

If you think you could give a xo design a shot and had some faith in it I'd definitely be willing to give it a shot.


Thanks.

[Jay]

Originally Posted by AV8ter

If you think you could give a xo design a shot and had some faith in it I'd definitely be willing to give it a shot.

I don't know your background or your understanding with electronics. I don't have your woofer and don't have experience with it. It means I can only make a simulation that I usually use as a starting point to make a real one.

In my experience, preliminary simulated crossover will work nicely if the driver doesn't have nasty breakup when use with simple crossover (I always start with simplest ones). It will better most ready made crossovers for sure, even if the FRD file is not precise. Because the most important thing is the phase data.

Using a precise FRD (measured or created as "in-box" FRD) the simulation result will be closer to reality.

I think the Peerless will be a good match for the XT25 because:

1) It seems the Peerless is one of the low distortion driver as mentioned in ZaphAudio site. I highly recommend low distortion drivers because they can make a speaker that will easily disappear. This is important for an enjoyable speaker. The XT25 is just one of those tweeter that can easily disappear even if mounted in ordinary baffle.

2) From my experience with XT25 (also from others' reports), even if its Fs is very low (600Hz?), in its stock form it is not suitable crossed low. It is one tweeter where you can use small series cap (as small as 1.5uF) and it will sound "normal". The Peerless seems to have a smooth response, at least from looking at the 30 degree (or more) off axis response. And no report about their strange behavior. I have just downloaded a Stone Sound Audio product (HD360) that uses the Peerless and a planar tweeter. From looking at their crossover, I think I can propose a simple high crossover point for the woofer.

3) For the box, you can copy other design. This woofer is suitable for vented if low frequency and small box is necessary (Vas=13lt). But to make a speaker that will easily disappear it will be easier using sealed enclosure. I'm very interested in ML-TL (for their low end at small enclosure) but I don't know how to simulate them. If this crossover work (if you decided to build it and found a good result) I will be interested also to build it and gain some help from experts here to design the MLTL box.

4) The T4 in the crossover (0.6 ohm) includes the DCR of the coil (T5). In tweaking I use this R to tune up the crossover. It will affect the slope, but more importantly is it will affect the phase. This way you can tune up by listening, an accurate driver blend that will not be seen from the chart. The other DCR is not critical (In simulation I usually use 0.2 ohm for big coil and 0.25 or 0.3 ohm for smaller coils).

5) The notch filter for the tweeter (L-R-C) will not affect the flatness of the response, because the weeter is crossed very high and this notch works on very low frequency (close to its Fs). But it will affect the phase so is mandatory I think. The values are easy to find and not critical. 94uF is because I usually use 2x 47uF

6) The only issue that may become serious (and demands complete change of the crossover) is whether the woofer will sound harsh crossed that high without notch around 5KHz. But I guess not.

7) This crossover is only a preliminary design with quality acceptance depends on user's standard of quality. I don't know your background, whether you can anticipate the arising issues or not, so you are free to use it, tweak it, or just leave it.