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12/10/18 at 17:56:18 


       



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What should the bass be like on HDTs? (Read 286 times)
Steve Harman
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What should the bass be like on HDTs?
08/27/18 at 08:46:50
 
Hi,

I'm helping a family member who has just completed building a pair of HDTs.  He's using the  modified Decware Fostex drivers and passive radiators and has followed the DIY plans to the mm!

Now they're finished and we're testing them out, it's fair to say the midrange and treble are incredibly impressive with great precision and excellent staging.

However if i'm honest I'm a little surprised with low frequencies / bass - I'd say things sound very light, not much punch or low-down weight to the bass - which if Wikipedia is to be believed sn't characteristic of transmission line designs?  

In fact referring to the Decware manual for the factory produced HDTs it notes that in smaller rooms there might be too much bass and suggests some steps to limit this, involving blocking the back port and wall positioning.   This is the opposite of our situation - too little bass.

We're new to HDTs and TL speakers so don't have others to compare against - my "lack of bass" comparison is against my own Decware Radial ERRs which deliver a great deal of energy at the low frequencies.

Back to the family-built HDTs - there seems to be plenty of activity and sound from the passive radiators but, again something we noted that's different to the manual for the factory built units - there doesn't seem to be much audio in the rear transmission chamber when we lift the "lids" off of the HDTs - in fact hardly anything. I believe the manual states that there will be "a lot" !

We're a bit stuck as to what to investigate - can any seasoned HDT owners comment please?

Thanks in advance.

Steve
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Steve Harman
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Re: What should the bass be like on HDTs?
Reply #1 - 08/27/18 at 12:47:01
 
Forgive the poor etiquette replying to my own post, but I have an idea.

The attached photo of someone else's build shows the bottom chamber where the internal ports send sound through to the rear transmission line chamber.

We have lined the BOTTOM of this chamber - the panel closest to the floor which isn't shown in the photo - with egg foam - so the internal pipes transfer sound straight down into foam.  Is this correct?  

It feels counter intuitive that the ports should send sound down into foam, but instead the sound should hit naked wood so it can "bounce around" into the transmission line space?

Thanks again.

Steve

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